From nobody Wed Jul 18 07:40:18 2018 Return-Path: X-Original-To: ice@ietfa.amsl.com Delivered-To: ice@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 131101311BE for ; Wed, 18 Jul 2018 07:40:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -17.51 X-Spam-Level: X-Spam-Status: No, score=-17.51 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, ENV_AND_HDR_SPF_MATCH=-0.5, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, T_DKIMWL_WL_MED=-0.01, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_DEF_SPF_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ZEhUWwlyX5C3 for ; Wed, 18 Jul 2018 07:40:02 -0700 (PDT) Received: from mail-it0-x229.google.com (mail-it0-x229.google.com [IPv6:2607:f8b0:4001:c0b::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E8DA81311A8 for ; Wed, 18 Jul 2018 07:40:00 -0700 (PDT) Received: by mail-it0-x229.google.com with SMTP id h2-v6so4489942itj.1 for ; Wed, 18 Jul 2018 07:40:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=jNF/nU4/X/FnkH1G6k9qxHInqxFTyL9QLBIsyj9O69k=; b=NLRTraHnCRqICsVnMrFlQq2n68tT8L1UjIKgTfH9243OMe1fFBGCCuGgr9GC4rIsFN yZEwsCII5zSiOLVXR3xo3eEIArcEc5/EKZ8gWLnsq/j8o5YnVPKLBoyj6XZE1wChPaLI HZHTfT19kSqstEEJLJ7l6X/U76bmY6xse21KaSO/PWATJ16Dlo3qUtw1vhbyEdqNcuVI ZK7MN7TblpLgAth97eVV/jOZfY3bhRRSDtee0WGB5BhM6ljvphZm1SA3ILlGtJFzFxqy ljk691UOI8vRmrIrpURKLSiBTTuoZKIZHJvgEDVNfoVL2WizrX6taNqmhkCTJ0uRXfBa ECQA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=jNF/nU4/X/FnkH1G6k9qxHInqxFTyL9QLBIsyj9O69k=; b=X3WBFzZ+QGTfCz5pZo8yAUIGEpBCW4nWLaHwP3Kgqm52sSXlaicGoFSG271VF/nDdG +xowssEbGtZLahIQv686/SxYnIn/uZhDc+B1HlIY3GhfHU1eUEuVbzVPLBYcRIvKtdMS 7ZWRWIn0Nc2EVGUz/AgKt01AEO48yB3kFj9LJJqqStS9NVLrsoLB/ZIzBlSNh6bPU9t8 jJrDvq7nE6/WjAh1MwLl7JJZNNJGb3EZVJQX65wXjnHZRF+ioCzdad0PzWIuiqm4hZE6 G8pZnnJqDBcj/jFNcIZlpmtZlBkOiMbmfokee3lpAFeZqZDRR/DnglFUYdp5tU5EhxmY 0GTw== X-Gm-Message-State: AOUpUlExXiGNj/czP6Ae/BGMpd0jydJhZqOtK3ZKr4L8FcXTF2qGdUTf 7t3kaGVsZjGfQl5SOHPkEr5HjIq02zoV1GxsvprfuD5s22M= X-Google-Smtp-Source: AAOMgpfWTRp1i3Z75UZj1YiYROofOHVo6l39W4fdZOGPQqTNgHaNTUW+CKr2+zT+OlQk8P7YOUQ6B6sM1NcDjodKc5I= X-Received: by 2002:a02:b804:: with SMTP id o4-v6mr5941988jam.12.1531924799634; Wed, 18 Jul 2018 07:39:59 -0700 (PDT) MIME-Version: 1.0 From: Justin Uberti Date: Wed, 18 Jul 2018 07:39:48 -0700 Message-ID: To: ice@ietf.org Content-Type: multipart/alternative; boundary="00000000000081cc7a0571470976" Archived-At: Subject: [Ice] Clarification on RFC 6724 text citation X-BeenThere: ice@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Interactive Connectivity Establishment \(ICE\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Jul 2018 14:40:17 -0000 --00000000000081cc7a0571470976 Content-Type: text/plain; charset="UTF-8" The latest version of ice-sip-sdp contains the highlighted text below. I'm probably missing something that was previously discussed, but I couldn't figure out what the "candidate pair" refers to. It sounds like the client should use RFC6724 to select the best IPv6 address on a per-local-candidate basis, e.g., a different remote address might be selected for a host candidate versus a relay candidate. Is that what was intended? > An IP > address SHOULD be used, but an FQDN MAY be used in place of an IP > address. In that case, when receiving an offer or answer > containing an FQDN in an a=candidate attribute, the FQDN is looked > up in the DNS first using an AAAA record (assuming the agent > supports IPv6), and if no result is found or the agent only > supports IPv4, using an A record. The rules from section 6 of > [RFC6724] is followed by fixing the source address to be one from > the candidate pair to be matched against destination addresses > reported by FQDN, in cases where the DNS query returns more than > one IP address. --00000000000081cc7a0571470976 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
The latest version of ice-sip-sdp contains the highli= ghted text below. I'm probably missing something that was previously di= scussed, but I couldn't figure out what the "candidate pair" = refers to.

It sounds like the client should use RF= C6724 to select the best IPv6 address on a per-local-candidate basis, e.g.,= a different remote address might be selected for a host candidate versus a= relay candidate. Is that what was intended?
=C2=A0
An IP
address SHOULD be used, but an FQDN MAY be used in place of an IP
address.=C2=A0 In that= case, when receiving an offer or answer
containing an FQDN in an a=3Dcandidate attribute, t= he FQDN is looked
up in the DNS first using an AAAA record (assuming the agent
supports IPv6), and if no resu= lt is found or the agent only
supports IPv4, using an A record.=C2=A0 The rules from section 6 of
[RFC6724] is followed by fixing the source address to = be one from
the c= andidate pair to be matched against destination addresses
reported by FQDN, in cases where t= he DNS query returns more than
 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Jul 2018 22:28:46 -0000 A new Request for Comments is now available in online RFC libraries. BCP 217 RFC 8421 Title: Guidelines for Multihomed and IPv4/IPv6 Dual-Stack Interactive Connectivity Establishment (ICE) Author: P. Martinsen, T. Reddy, P. Patil Status: Best Current Practice Stream: IETF Date: July 2018 Mailbox: palmarti@cisco.com, TirumaleswarReddy_Konda@McAfee.com, praspati@cisco.com Pages: 9 Characters: 20268 See Also: BCP 217 I-D Tag: draft-ietf-ice-dualstack-fairness-07.txt URL: https://www.rfc-editor.org/info/rfc8421 DOI: 10.17487/RFC8421 This document provides guidelines on how to make Interactive Connectivity Establishment (ICE) conclude faster in multihomed and IPv4/IPv6 dual-stack scenarios where broken paths exist. The provided guidelines are backward compatible with the original ICE specification (see RFC 5245). This document is a product of the Interactive Connectivity Establishment Working Group of the IETF. BCP: This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements. Distribution of this memo is unlimited. This announcement is sent to the IETF-Announce and rfc-dist lists. To subscribe or unsubscribe, see https://www.ietf.org/mailman/listinfo/ietf-announce https://mailman.rfc-editor.org/mailman/listinfo/rfc-dist For searching the RFC series, see https://www.rfc-editor.org/search For downloading RFCs, see https://www.rfc-editor.org/retrieve/bulk Requests for special distribution should be addressed to either the author of the RFC in question, or to rfc-editor@rfc-editor.org. Unless specifically noted otherwise on the RFC itself, all RFCs are for unlimited distribution. The RFC Editor Team Association Management Solutions, LLC From nobody Thu Jul 19 15:29:10 2018 Return-Path: X-Original-To: ice@ietfa.amsl.com Delivered-To: ice@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0FE7C130FAB; Thu, 19 Jul 2018 15:28:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.201 X-Spam-Level: X-Spam-Status: No, score=-4.201 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id r6KwYObrDT7a; Thu, 19 Jul 2018 15:28:51 -0700 (PDT) Received: from rfc-editor.org (rfc-editor.org [4.31.198.49]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C940E130FEB; Thu, 19 Jul 2018 15:28:51 -0700 (PDT) Received: by rfc-editor.org (Postfix, from userid 30) id CF604B81B5E; Thu, 19 Jul 2018 15:28:45 -0700 (PDT) To: ietf-announce@ietf.org, rfc-dist@rfc-editor.org X-PHP-Originating-Script: 1005:ams_util_lib.php From: rfc-editor@rfc-editor.org Cc: rfc-editor@rfc-editor.org, drafts-update-ref@iana.org, ice@ietf.org Content-type: text/plain; charset=UTF-8 Message-Id: <20180719222845.CF604B81B5E@rfc-editor.org> Date: Thu, 19 Jul 2018 15:28:45 -0700 (PDT) Archived-At: Subject: [Ice] =?utf-8?q?RFC_8445_on_Interactive_Connectivity_Establishme?= =?utf-8?q?nt_=28ICE=29=3A_A_Protocol_for_Network_Address_Translator_=28NA?= =?utf-8?q?T=29_Traversal?= X-BeenThere: ice@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Interactive Connectivity Establishment \(ICE\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Jul 2018 22:29:03 -0000 A new Request for Comments is now available in online RFC libraries. RFC 8445 Title: Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal Author: A. Keranen, C. Holmberg, J. Rosenberg Status: Standards Track Stream: IETF Date: July 2018 Mailbox: ari.keranen@ericsson.com, christer.holmberg@ericsson.com, jdrosen@jdrosen.net Pages: 100 Characters: 239713 Obsoletes: RFC 5245 I-D Tag: draft-ietf-ice-rfc5245bis-20.txt URL: https://www.rfc-editor.org/info/rfc8445 DOI: 10.17487/RFC8445 This document describes a protocol for Network Address Translator (NAT) traversal for UDP-based communication. This protocol is called Interactive Connectivity Establishment (ICE). ICE makes use of the Session Traversal Utilities for NAT (STUN) protocol and its extension, Traversal Using Relay NAT (TURN). This document obsoletes RFC 5245. This document is a product of the Interactive Connectivity Establishment Working Group of the IETF. This is now a Proposed Standard. STANDARDS TRACK: This document specifies an Internet Standards Track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the Official Internet Protocol Standards (https://www.rfc-editor.org/standards) for the standardization state and status of this protocol. Distribution of this memo is unlimited. This announcement is sent to the IETF-Announce and rfc-dist lists. To subscribe or unsubscribe, see https://www.ietf.org/mailman/listinfo/ietf-announce https://mailman.rfc-editor.org/mailman/listinfo/rfc-dist For searching the RFC series, see https://www.rfc-editor.org/search For downloading RFCs, see https://www.rfc-editor.org/retrieve/bulk Requests for special distribution should be addressed to either the author of the RFC in question, or to rfc-editor@rfc-editor.org. Unless specifically noted otherwise on the RFC itself, all RFCs are for unlimited distribution. The RFC Editor Team Association Management Solutions, LLC From nobody Fri Jul 20 09:47:04 2018 Return-Path: X-Original-To: ice@ietfa.amsl.com Delivered-To: ice@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 05950130F3E for ; Fri, 20 Jul 2018 09:47:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.31 X-Spam-Level: X-Spam-Status: No, score=-4.31 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_DKIMWL_WL_HIGH=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=ericsson.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2Dzed6M5TnHC for ; Fri, 20 Jul 2018 09:47:00 -0700 (PDT) Received: from sessmg23.ericsson.net (sessmg23.ericsson.net [193.180.251.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DAAE6130E54 for ; Fri, 20 Jul 2018 09:46:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; d=ericsson.com; s=mailgw201801; c=relaxed/simple; q=dns/txt; i=@ericsson.com; t=1532105218; h=From:Sender:Reply-To:Subject:Date:Message-ID:To:Cc:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=/4kVNfhr3lAUpjkxRXjZ7ILpmgUqegT0wVN5rhtNYNI=; b=QVjy2CVnCKzMiHCGVP2clQBfQONjy1hXMl3QPy7oeUh+J52gOcXCd4rt3pu8bf0k V640x0DyeABFlZAsnLUgZHkJ4NjYaZ9lYVojS9f0vn/BL4Bs8gltrCnw4X4rHWSZ qJBa6iMiDw1FjeOTedi7pEqKrGhT3Mw+TREUZwhMagA=; X-AuditID: c1b4fb2d-5ecb19c0000055ff-29-5b5212029a4d Received: from ESESSMB502.ericsson.se (Unknown_Domain [153.88.183.120]) by sessmg23.ericsson.net (Symantec Mail Security) with SMTP id 34.5D.22015.202125B5; Fri, 20 Jul 2018 18:46:58 +0200 (CEST) Received: from ESESBMB502.ericsson.se (153.88.183.169) by ESESSMB502.ericsson.se (153.88.183.163) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1466.3; Fri, 20 Jul 2018 18:46:57 +0200 Received: from ESESBMB502.ericsson.se ([153.88.183.185]) by ESESBMB502.ericsson.se ([153.88.183.185]) with mapi id 15.01.1466.003; Fri, 20 Jul 2018 18:46:57 +0200 From: =?iso-8859-1?Q?Ari_Ker=E4nen?= To: ICE WG Thread-Topic: [Ice] RFC 8445 on Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal Thread-Index: AQHUH6/6sCeNwfzE5kiIryZXwqq8haSYMaOA Date: Fri, 20 Jul 2018 16:46:57 +0000 Message-ID: References: <20180719222845.CF604B81B5E@rfc-editor.org> In-Reply-To: <20180719222845.CF604B81B5E@rfc-editor.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [153.88.183.153] Content-Type: text/plain; charset="iso-8859-1" Content-ID: <61555BE7FD5F7348A330732C84CF0E69@ericsson.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupmkeLIzCtJLcpLzFFi42KZGbG9QpdJKCjaoL9d0OLbhVoHRo8lS34y BTBGcdmkpOZklqUW6dslcGV8PfaWqeClWMXmln+sDYzzBbsYOTkkBEwkvn26x9TFyMUhJHCU UeJP3z4WCOcbo8TRW0eZIZxljBI77/5kB2lhE7CXmLzmIyOILSIgKdHyZyMriC0s0MEocb7V F6RBRKCTUWLvv19ACQ4gx0hifYsDSA2LgKrE9UvfmEFsXqA523etB+sVEjCX2HC7EyzOKWAh sWrifDYQm1FATOL7qTVMIDazgLjErSfzmSDOFpBYsuc8M4QtKvHy8T9WCFtJYu+x6ywQ9XoS N6ZOYYOwrSVWfpzCDmFrSyxb+BrqBkGJkzOfsExgFJuFZMUsJO2zkLTPQtI+C0n7AkbWVYyi xanFxbnpRsZ6qUWZycXF+Xl6eaklmxiBUXRwy2/dHYyrXzseYhTgYFTi4X3GHhQtxJpYVlyZ e4hRgoNZSYR3wtuAaCHelMTKqtSi/Pii0pzU4kOM0hwsSuK8eqv2RAkJpCeWpGanphakFsFk mTg4pRoYy+Mav8++Z8u49dOb9sQ1wqqzns8W+cA3N9zU1MuUeWdER+Di3P9Xjk9QenmrRdJX fOMPz023eh/NXM/Wr/aqcEvKfalGodN/9kjZXuh6+ndj/4IzfNoNgW7XQ5yDND5lWX001iq8 kKI9c5Njio1hWQfzg7kBP745z/7+tcb5neJls4VrpAP6lViKMxINtZiLihMB1ZOkJJ4CAAA= Archived-At: Subject: Re: [Ice] RFC 8445 on Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal X-BeenThere: ice@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Interactive Connectivity Establishment \(ICE\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Jul 2018 16:47:03 -0000 ICE WG, This is great news! I'd like to thank you all for the hard work over the (m= any, many) years you have put into making this happen. Cheers, Ari > On 19 Jul 2018, at 18.28, rfc-editor@rfc-editor.org wrote: >=20 > A new Request for Comments is now available in online RFC libraries. >=20 >=20 > RFC 8445 >=20 > Title: Interactive Connectivity Establishment (ICE):=20 > A Protocol for Network Address Translator (NAT)=20 > Traversal=20 > Author: A. Keranen, > C. Holmberg, > J. Rosenberg > Status: Standards Track > Stream: IETF > Date: July 2018 > Mailbox: ari.keranen@ericsson.com,=20 > christer.holmberg@ericsson.com,=20 > jdrosen@jdrosen.net > Pages: 100 > Characters: 239713 > Obsoletes: RFC 5245 >=20 > I-D Tag: draft-ietf-ice-rfc5245bis-20.txt >=20 > URL: https://www.rfc-editor.org/info/rfc8445 >=20 > DOI: 10.17487/RFC8445 >=20 > This document describes a protocol for Network Address Translator > (NAT) traversal for UDP-based communication. This protocol is called > Interactive Connectivity Establishment (ICE). ICE makes use of the > Session Traversal Utilities for NAT (STUN) protocol and its > extension, Traversal Using Relay NAT (TURN). >=20 > This document obsoletes RFC 5245. >=20 > This document is a product of the Interactive Connectivity Establishment = Working Group of the IETF. >=20 > This is now a Proposed Standard. >=20 > STANDARDS TRACK: This document specifies an Internet Standards Track > protocol for the Internet community, and requests discussion and suggesti= ons > for improvements. Please refer to the current edition of the Official > Internet Protocol Standards (https://www.rfc-editor.org/standards) for th= e=20 > standardization state and status of this protocol. Distribution of this= =20 > memo is unlimited. >=20 > This announcement is sent to the IETF-Announce and rfc-dist lists. > To subscribe or unsubscribe, see > https://www.ietf.org/mailman/listinfo/ietf-announce > https://mailman.rfc-editor.org/mailman/listinfo/rfc-dist >=20 > For searching the RFC series, see https://www.rfc-editor.org/search > For downloading RFCs, see https://www.rfc-editor.org/retrieve/bulk >=20 > Requests for special distribution should be addressed to either the > author of the RFC in question, or to rfc-editor@rfc-editor.org. Unless > specifically noted otherwise on the RFC itself, all RFCs are for > unlimited distribution. >=20 >=20 > The RFC Editor Team > Association Management Solutions, LLC >=20 > _______________________________________________ > Ice mailing list > Ice@ietf.org > https://www.ietf.org/mailman/listinfo/ice From nobody Fri Jul 20 10:34:39 2018 Return-Path: X-Original-To: ice@ietfa.amsl.com Delivered-To: ice@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 09800130F90 for ; Fri, 20 Jul 2018 10:34:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=mozilla.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zuLOJLLD6cOF for ; 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Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="CGfEPXEAQ4kosmoUbxEudnQBKi1zXTdNh" Archived-At: Subject: Re: [Ice] RFC 8445 on Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal X-BeenThere: ice@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Interactive Connectivity Establishment \(ICE\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Jul 2018 17:34:37 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --CGfEPXEAQ4kosmoUbxEudnQBKi1zXTdNh Content-Type: multipart/mixed; boundary="yECBSdy1OcZ27FjWVBp3pV6O2digrSXx5"; protected-headers="v1" From: Peter Saint-Andre To: ice@ietf.org Message-ID: Subject: Re: [Ice] RFC 8445 on Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal References: <20180719222845.CF604B81B5E@rfc-editor.org> In-Reply-To: --yECBSdy1OcZ27FjWVBp3pV6O2digrSXx5 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable +1! With 8445 published and trickle in the RFC Editor's queue, it looks like we can update the WG milestones. :-) On 7/20/18 10:46 AM, Ari Ker=C3=A4nen wrote: > ICE WG, >=20 > This is great news! I'd like to thank you all for the hard work over th= e (many, many) years you have put into making this happen. >=20 >=20 > Cheers, > Ari >=20 >> On 19 Jul 2018, at 18.28, rfc-editor@rfc-editor.org wrote: >> >> A new Request for Comments is now available in online RFC libraries. >> >> >> RFC 8445 >> >> Title: Interactive Connectivity Establishment (ICE):=20 >> A Protocol for Network Address Translator (NAT)=20 >> Traversal=20 >> Author: A. Keranen, >> C. Holmberg, >> J. Rosenberg >> Status: Standards Track >> Stream: IETF >> Date: July 2018 >> Mailbox: ari.keranen@ericsson.com,=20 >> christer.holmberg@ericsson.com,=20 >> jdrosen@jdrosen.net >> Pages: 100 >> Characters: 239713 >> Obsoletes: RFC 5245 >> >> I-D Tag: draft-ietf-ice-rfc5245bis-20.txt >> >> URL: https://www.rfc-editor.org/info/rfc8445 >> >> DOI: 10.17487/RFC8445 >> >> This document describes a protocol for Network Address Translator >> (NAT) traversal for UDP-based communication. This protocol is called >> Interactive Connectivity Establishment (ICE). ICE makes use of the >> Session Traversal Utilities for NAT (STUN) protocol and its >> extension, Traversal Using Relay NAT (TURN). >> >> This document obsoletes RFC 5245. >> >> This document is a product of the Interactive Connectivity Establishme= nt Working Group of the IETF. >> >> This is now a Proposed Standard. >> >> STANDARDS TRACK: This document specifies an Internet Standards Track >> protocol for the Internet community, and requests discussion and sugge= stions >> for improvements. Please refer to the current edition of the Official= >> Internet Protocol Standards (https://www.rfc-editor.org/standards) for= the=20 >> standardization state and status of this protocol. Distribution of th= is=20 >> memo is unlimited. >> >> This announcement is sent to the IETF-Announce and rfc-dist lists. >> To subscribe or unsubscribe, see >> https://www.ietf.org/mailman/listinfo/ietf-announce >> https://mailman.rfc-editor.org/mailman/listinfo/rfc-dist >> >> For searching the RFC series, see https://www.rfc-editor.org/search >> For downloading RFCs, see https://www.rfc-editor.org/retrieve/bulk >> >> Requests for special distribution should be addressed to either the >> author of the RFC in question, or to rfc-editor@rfc-editor.org. Unles= s >> specifically noted otherwise on the RFC itself, all RFCs are for >> unlimited distribution. >> >> >> The RFC Editor Team >> Association Management Solutions, LLC >> >> _______________________________________________ >> Ice mailing list >> Ice@ietf.org >> https://www.ietf.org/mailman/listinfo/ice >=20 > _______________________________________________ > Ice mailing list > Ice@ietf.org > https://www.ietf.org/mailman/listinfo/ice >=20 --yECBSdy1OcZ27FjWVBp3pV6O2digrSXx5-- --CGfEPXEAQ4kosmoUbxEudnQBKi1zXTdNh Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEENVUj07j078lgnb70ZWGMGH9oFKkFAltSHScACgkQZWGMGH9o FKl/dg/9FnsJL7Z8EpxLzBwLPWKtSOjjzPBgXERb/9jSL9PsG9iETvmj7plGitFK 80MLomGghc5epH0gaQlsZfn6OX+S9/UfNJR7jpEqEFWheq09Wcfzp6cL+rpXKMW3 DSSoSB4WEDw5eBYkVS7FrScnEtBuGVbpsm9ZbW04vsSePpJP1dore0WdPv8DWOw2 LYegFd3XuBcHxMKbVHUX3R5/PJv52GUTbtI2cFCe1z5jVLKvLGYF/CKWK40DIMQc 7U+hWRKlbihl8D+D6SdqoVkZfVJYHsjBxlsM2lYx7wyXl72kz/o97rRcsQ5MDNrn Go33T/qVFbJEg4kvksJeJ9bXqRJiCToa+v1wBWEIDHB1XheUuqvCuvyAygLUpz4U gUqO2Zm2qHeC0BBe1N5VUufh5flqo0+gnFzL/TbLmSv1h7VTccllMgQI8DClDej3 BYD7URBWMAoYQTd4M5TfeqRM3IgfXHx1MTB4K1bLjG11wVxE4L/Bv7jLoixSw8yx w5bRxE1MpUkCCqOYRgnjR7hgD7wcCx+vg1PmlfQIMOfSqHrC5whO56U/V9Ug7Azp lu7BjUjaxQOe3GBcipyf7gaHYwc7aHQRqDCds5iGa2UxtNxeZFa0P/MsFVyj1RX3 ruegCGlEnoMrwVIoR+VX0Ay0XELPDbWff5kvyb035htxd4qiMRE= =fWSI -----END PGP SIGNATURE----- --CGfEPXEAQ4kosmoUbxEudnQBKi1zXTdNh-- From nobody Fri Jul 20 11:11:41 2018 Return-Path: X-Original-To: ice@ietf.org Delivered-To: ice@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 620D7130F3C for ; Fri, 20 Jul 2018 11:11:40 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit To: X-Test-IDTracker: no X-IETF-IDTracker: 6.82.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <153211030039.11449.11726949558264882415.idtracker@ietfa.amsl.com> Date: Fri, 20 Jul 2018 11:11:40 -0700 From: IETF Secretariat Archived-At: Subject: [Ice] Milestones changed for ice WG X-BeenThere: ice@ietf.org X-Mailman-Version: 2.1.27 List-Id: "Interactive Connectivity Establishment \(ICE\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Jul 2018 18:11:41 -0000 Changed milestone "Submit a revision of ICE (RFC 5245) as Proposed Standard (draft-ietf-mmusic-ice-sip-sdp remains in MMUSIC) ", resolved as "Done". Changed milestone "Submit Trickle ICE as Proposed Standard (draft-ietf-mmusic-trickle-ice-sip remains in MMUSIC)", resolved as "Done". URL: https://datatracker.ietf.org/wg/ice/about/ From nobody Fri Jul 20 11:18:01 2018 Return-Path: X-Original-To: ice@ietfa.amsl.com Delivered-To: ice@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 429C512DD85 for ; Fri, 20 Jul 2018 11:17:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.331 X-Spam-Level: X-Spam-Status: No, score=-3.331 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FROM_EXCESS_BASE64=0.979, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_DKIMWL_WL_HIGH=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=ericsson.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vgenFYy4Jney for ; Fri, 20 Jul 2018 11:17:56 -0700 (PDT) Received: from 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d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=L2o/Pthf8mFRJPQ6kgeRk60D+JB5ZQ7xsaDdZnogMsw=; b=F5e5R25lrfQbRjHYXYgw+ieaockpBuGGtQn6/6r5JoOQ2ryoerfQ4PwNSUZMlJmoRP /CFhQGF2LbFxDQBSlF3k11pIti6c6wQFKXYTH28mraS3I/7I4ePmiwJwT/YTeAQ0D1q2 2RnPA+hexex4wFLyG4yHz83uRXY8wXaM1VUmJL7qAwOPgkYZbblHRdnQjbKPCa6nxXUM SaaNXSVQc7mRuEqHZGWEXRXL+x/1D0Y1IZrDbVTt+jjnvZqaDA3hhds9A4DGn61Dn9gm TKiAS0Qud4KhqmTdWfswL6Nko3Fhv6zrwcCOTgz/Q40KWDVAFsowUQMRpa3A7TuA4BwX oeTQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=L2o/Pthf8mFRJPQ6kgeRk60D+JB5ZQ7xsaDdZnogMsw=; b=NeVNWz/+HOs8mNtdlwY15ahwvl/wbRWNSLnSz6IqbMgF41s8FPeDGkzjiafin3wqax gP8BYfY/WeJN0AMfYWTH3hOGhCMfbwjITFp8abHRKLSJn1xlpwOzQabsayTrGATJ5SRH Pp3MUpEJWkSk7/aNgQjco8r3mkusuVYt1RSP+37UYdqIq13mY2gbMMR/eg/a3l7Jx1/w 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X-List-Received-Date: Mon, 23 Jul 2018 17:57:24 -0000 --0000000000005fa9400571ae6086 Content-Type: text/plain; charset="UTF-8" I wasn't involved in writing that text, and it's in the MMUSIC WG, not the ICE WG, but it does seem like the intention changed to what you are saying. In 5245 that text was "If the DNS query returns more than one IP address, one is chosen, and then used for the remainder of ICE processing." And the text before it (in both 5245 and ice-sip-sdp) says "when receiving an offer or answer". So it's clear that the 5245 intention was to make one decision for a remote candidate and then apply that same one for all candidate pairs with that remote candidate. But this text removes "for the remainder of ICE processing" and treats 6724 section 6 as a function that takes two arguments: the remote (destination) addresses *and *the local (source) address. Clearly doing so could end up with different choices depending on the local (source) IP address. So it seems intentional to allow each candidate pair to have a different IP address even though they share the same remote candidate FQDN. I find the new text confusing and think it would be more clear as something like "If the DNS query returns more than one IP address, followt the rules in section 6 of [RFC6274] for each local candidate by using the address of the local candidate as the source address and the addresses from the result of the DNS query as the list of destination addresses. This may result in different candidate pairs having different remote addresses even though they share the same remote candidate". If all of this is true and this change was intentional and the rules are meant to be run for each local candidate, then I think trickle would need to specify that such rules need to be applied whenever a new local candidate is gathered, which means an implementation would need to remember the entire list of destination addresses until ICE processing is complete. On Wed, Jul 18, 2018 at 7:40 AM Justin Uberti wrote: > The latest version of ice-sip-sdp contains the highlighted text below. I'm > probably missing something that was previously discussed, but I couldn't > figure out what the "candidate pair" refers to. > > It sounds like the client should use RFC6724 to select the best IPv6 > address on a per-local-candidate basis, e.g., a different remote address > might be selected for a host candidate versus a relay candidate. Is that > what was intended? > > >> An IP >> address SHOULD be used, but an FQDN MAY be used in place of an IP >> address. In that case, when receiving an offer or answer >> containing an FQDN in an a=candidate attribute, the FQDN is looked >> up in the DNS first using an AAAA record (assuming the agent >> supports IPv6), and if no result is found or the agent only >> supports IPv4, using an A record. The rules from section 6 of >> [RFC6724] is followed by fixing the source address to be one from >> the candidate pair to be matched against destination addresses >> reported by FQDN, in cases where the DNS query returns more than >> one IP address. > > _______________________________________________ > Ice mailing list > Ice@ietf.org > https://www.ietf.org/mailman/listinfo/ice > --0000000000005fa9400571ae6086 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I wasn't involved in writing that text, and it= 9;s in the MMUSIC WG, not the ICE WG, but it does seem like the intention c= hanged to what you are saying.

In 5245 that text w= as "If the DNS query returns more than one IP address, one is chosen, = and then used for the remainder of ICE processing."=C2=A0 And the text= before it (in both 5245 and=C2=A0ice-s= ip-sdp) says "when receiving an offer o= r answer".=C2=A0 So it's clear that the 5245 intention was to make= one decision for a remote candidate and then apply that same one for all c= andidate pairs with that remote candidate.

But this text remove= s "for the remainder of ICE processing" and treats 6724 section 6= as a function that takes two arguments: the remote (destination) addresses= and the local (source) address.=C2=A0 Clearly doing so could end up= with different choices depending on the local (source) IP address.=C2=A0 S= o it seems intentional to allow each candidate pair to have a different IP = address even though they share the same remote candidate FQDN.
=

I find the new text confusing a= nd think it would be more clear as something like=C2=A0"If the = DNS query returns more than one IP address, followt the rules in section 6 = of [RFC6274] for each local candidate by using the address of the local can= didate as the source address and the addresses from the result of the DNS q= uery as the list of destination addresses.=C2=A0 This may result in differe= nt candidate pairs having different remote addresses even though they share= the same remote candidate".

If all of this i= s true and this change was intentional and the rules are meant to be run fo= r each local candidate, then I think trickle would need to specify that suc= h rules need to be applied whenever a new local candidate is gathered, whic= h means an implementation would need to remember the entire list of destina= tion addresses until ICE processing is complete.

<= br class=3D"inbox-inbox-Apple-interchange-newline">





On Wed, Jul 18, 2018 at 7:40 AM Justin Ub= erti <juberti=3D40google.= com@dmarc.ietf.org> wrote:
<= div dir=3D"ltr">
The latest version of ice-sip-sdp contains the highlig= hted text below. I'm probably missing something that was previously dis= cussed, but I couldn't figure out what the "candidate pair" r= efers to.

It sounds like the client should use RFC= 6724 to select the best IPv6 address on a per-local-candidate basis, e.g., = a different remote address might be selected for a host candidate versus a = relay candidate. Is that what was intended?
=C2=A0
An IP
address SHOULD be used, but an FQDN MAY be used in place of an IP
address.=C2=A0 In that = case, when receiving an offer or answer
containing an FQDN in an a=3Dcandidate attribute, th= e FQDN is looked
= up in the DNS first using an AAAA record (assuming the agent
supports IPv6), and if no resul= t is found or the agent only
supports IPv4, using an A record.=C2=A0 The rules from section 6 of
[RFC6724] is followed by fixing the source address to b= e one from
the ca= ndidate pair to be matched against destination addresses
reported by FQDN, in cases where th= e DNS query returns more than
one IP address.
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h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=lIBq+LA/p+aQ9Ih4N4Fk8YbmNA9M3dn/58jrQHiDfuk=; b=bat5SyhLPLhFGWyiGK2e/kIgmyT88YjnHvQFs4mMNIxiYcH5jhFWDFL3SqKqFOvqz/ 9b5YusxeuA6Iw1ve0nbrD9swK167FKyMOAAaeuljoQKBxvvqhB5VqSXi0Gzdkn08YXsN CUY/QXNGZ5SIVqy0GI07o1isuSqSEVYBge5Ui7bFAzawRFJZshNqYkEPisUWhwgB7k/T g9qfKCS5vv+s/2gwYL8jwuzEPPTXzIC6mwHcSKZn6WxkwvHnfJDDNOQaNY6rqdz170GL /lRo7nptkOx1FZQpXSg65OWSS4B1fzcptu/VlIVk7Zgn9aoeLDsivMQWWSIy/bQX2ex0 /ROg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=lIBq+LA/p+aQ9Ih4N4Fk8YbmNA9M3dn/58jrQHiDfuk=; b=WLjqZ9AK3ZN8GOJbpPqk7PwDcdywqAEV20pV0zaMywXMnfTaXibaN7PBA8wDV7RTf2 +sVLI7BY0o6235iNd+KL1byoTTAg+9D2MMHJiLVpWtnN3PT+VhAA1sDZHYYDpJRvZbT0 zYlQNE7JhylkLp74d7DmMA4MUSOLtzzd3tTOx5Ibp7y0tYJowZ5GjdrI1gWjHXA4mqgM AfMbZHrIgqe7HvpSsRUc7h0EvsAFvXR1DJ+QzZQK4bMOE9ZAELllG9tbvRX7J7eV3SJy 5LKNA5vo/FsIFu3FkOn0CF3t+AZp4Xof5ApgrmRnx7ZN7YCpcsPKHdOg3UzBbTmS3igE HwfA== X-Gm-Message-State: AOUpUlG9Hdm5rzvnPILuF6yXtAPQjFL6e8UioZijjPd5B8mogVu5goZk BHDxvgsHaq+FYTb/CXayUmsDnIiSTzbatFeUOMMfOg== X-Google-Smtp-Source: AAOMgpeXzAJjRz6NuD/O/8n7FPfso7u3NB1RuAluD7CcsdKwX875w0aRHoU5gjVCwY1XYKW4ngyAWZmgJ77xEY9KGoo= X-Received: by 2002:adf:ffc7:: with SMTP id x7-v6mr13089628wrs.137.1532465030138; Tue, 24 Jul 2018 13:43:50 -0700 (PDT) MIME-Version: 1.0 References: <9fff0265a9394474b4a679901acd8841@ericsson.com> In-Reply-To: <9fff0265a9394474b4a679901acd8841@ericsson.com> From: Peter Thatcher Date: Tue, 24 Jul 2018 13:43:38 -0700 Message-ID: To: Christer Holmberg Cc: Justin Uberti , "ice@ietf.org" Content-Type: multipart/alternative; boundary="000000000000c137f00571c4d19d" Archived-At: Subject: Re: [Ice] Clarification on RFC 6724 text citation X-BeenThere: ice@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Interactive Connectivity Establishment \(ICE\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Jul 2018 20:44:04 -0000 --000000000000c137f00571c4d19d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable It depends on if you're talking about the signaled candidate or the remote candidate used in the candidate pair. The signaled candidate can be a FQDN, so it can have multiple IPs. But a candidate pair can only have one IP on its remote end. So we need a mapping from one to the other. The old mapping was "pick one with unspecified behavior when you receive the signaling and use it for all candidate pairs". The new mapping seems to be "pick one when doing candidate pairing using section 6 of RFC 6724 and each candidate pair may choose a different one". On Tue, Jul 24, 2018 at 12:21 AM Christer Holmberg < christer.holmberg@ericsson.com> wrote: > Hi, > > > > A candidate is per definition associated with an IP address, so it sounds > confusing to me how a DNS query for a FQDN associated with that candidate > would return multiple addresses. > > > > Wouldn=E2=80=99t that mean that the FQDN represents multiple candidates (= one for > each returned IP address)? > > > > Regards, > > > > Christer > > > > *From:* Ice [mailto:ice-bounces@ietf.org] *On Behalf Of *Peter Thatcher > *Sent:* 23 July 2018 20:57 > *To:* Justin Uberti > *Cc:* ice@ietf.org > *Subject:* Re: [Ice] Clarification on RFC 6724 text citation > > > > I wasn't involved in writing that text, and it's in the MMUSIC WG, not th= e > ICE WG, but it does seem like the intention changed to what you are sayin= g. > > > > In 5245 that text was "If the DNS query returns more than one IP address, > one is chosen, and then used for the remainder of ICE processing." And t= he > text before it (in both 5245 and ice-sip-sdp) says "when receiving an > offer or answer". So it's clear that the 5245 intention was to make one > decision for a remote candidate and then apply that same one for all > candidate pairs with that remote candidate. > > > > But this text removes "for the remainder of ICE processing" and treats > 6724 section 6 as a function that takes two arguments: the remote > (destination) addresses *and *the local (source) address. Clearly doing > so could end up with different choices depending on the local (source) IP > address. So it seems intentional to allow each candidate pair to have a > different IP address even though they share the same remote candidate FQD= N. > > > > I find the new text confusing and think it would be more clear as > something like "If the DNS query returns more than one IP address, > followt the rules in section 6 of [RFC6274] for each local candidate by > using the address of the local candidate as the source address and the > addresses from the result of the DNS query as the list of destination > addresses. This may result in different candidate pairs having different > remote addresses even though they share the same remote candidate". > > > > If all of this is true and this change was intentional and the rules are > meant to be run for each local candidate, then I think trickle would need > to specify that such rules need to be applied whenever a new local > candidate is gathered, which means an implementation would need to rememb= er > the entire list of destination addresses until ICE processing is complete= . > > > > > > > > > > > > > > > > On Wed, Jul 18, 2018 at 7:40 AM Justin Uberti 40google.com@dmarc.ietf.org> wrote: > > The latest version of ice-sip-sdp contains the highlighted text below. I'= m > probably missing something that was previously discussed, but I couldn't > figure out what the "candidate pair" refers to. > > > > It sounds like the client should use RFC6724 to select the best IPv6 > address on a per-local-candidate basis, e.g., a different remote address > might be selected for a host candidate versus a relay candidate. Is that > what was intended? > > > > An IP > address SHOULD be used, but an FQDN MAY be used in place of an IP > address. In that case, when receiving an offer or answer > containing an FQDN in an a=3Dcandidate attribute, the FQDN is looked > up in the DNS first using an AAAA record (assuming the agent > supports IPv6), and if no result is found or the agent only > supports IPv4, using an A record. The rules from section 6 of > [RFC6724] is followed by fixing the source address to be one from > the candidate pair to be matched against destination addresses > reported by FQDN, in cases where the DNS query returns more than > one IP address. > > _______________________________________________ > Ice mailing list > Ice@ietf.org > https://www.ietf.org/mailman/listinfo/ice > > --000000000000c137f00571c4d19d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
It depends on if you're talking about the signaled can= didate or the remote candidate used in the candidate pair.=C2=A0 The signal= ed candidate can be a FQDN, so it can have multiple IPs.=C2=A0 But a candid= ate pair can only have one IP on its remote end.=C2=A0 So we need a mapping= from one to the other.=C2=A0 The old mapping was "pick one with unspe= cified behavior when you receive the signaling and use it for all candidate= pairs".=C2=A0 The new mapping seems to be "pick one when doing c= andidate pairing using section 6 of RFC 6724 and each candidate pair may ch= oose a different one".=C2=A0=C2=A0

On Tue, Jul 24, 2018 at 12:21 AM Christer Holmberg <christer.holmberg@ericsson.= com> wrote:

Hi,

=C2=A0

A candidate is per definition associa= ted with an IP address, so it sounds confusing to me how a DNS query for a = FQDN associated with that candidate would return multiple addresses.

=C2=A0

Wouldn=E2=80=99t that mean that the F= QDN represents multiple candidates (one for each returned IP address)?

=C2=A0

Regards,

=C2=A0

Christer

<= span style=3D"font-size:11.0pt;font-family:"Calibri",sans-serif;c= olor:#1f497d">=C2=A0

From: = Ice [mailto:ice-b= ounces@ietf.org] On Behalf Of Peter Thatcher
Sent: 23 July 2018 20:57
To: Justin Uberti <juberti=3D40google.com@dmarc.ietf.org>
Cc: ice@ietf.org
Subject: Re: [Ice] Clarification on RFC 6724 text citation=

=C2=A0

I wasn't involved in writing that text, and it&#= 39;s in the MMUSIC WG, not the ICE WG, but it does seem like the intention = changed to what you are saying.

=C2=A0

In 5245 that text was "If the DNS query returns= more than one IP address, one is chosen, and then used for the remainder o= f ICE processing."=C2=A0 And the text before it (in both 5245 and=C2= =A0ice-sip-sdp) says "when receiving an offer or answer".=C2=A0 So it's clear that the 5245 intention = was to make one decision for a remote candidate and then apply that same on= e for all candidate pairs with that remote candidate.<= /p>

=C2=A0

But this text removes = "for the remainder of ICE processing" and treats 6724 section 6 a= s a function that takes two arguments: the remote (destination) addresses and the local (source) address.=C2=A0 Clearly doing so could end up = with different choices depending on the local (source) IP address.=C2=A0 So= it seems intentional to allow each candidate pair to have a different IP a= ddress even though they share the same remote candidate FQDN.

=C2=A0

I find the new text co= nfusing and think it would be more clear as something like=C2=A0&quo= t;If the DNS query returns more than one IP address, followt the rules in s= ection 6 of [RFC6274] for each local candidate by using the address of the local candidate as the source address and the = addresses from the result of the DNS query as the list of destination addre= sses.=C2=A0 This may result in different candidate pairs having different r= emote addresses even though they share the same remote candidate".

=C2=A0

If all of this is true and this change was intention= al and the rules are meant to be run for each local candidate, then I think= trickle would need to specify that such rules need to be applied whenever = a new local candidate is gathered, which means an implementation would need to remember the entire list of de= stination addresses until ICE processing is complete.

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0

The latest version of ice-sip-sdp contains the highl= ighted text below. I'm probably missing something that was previously d= iscussed, but I couldn't figure out what the "candidate pair"= refers to.

=C2=A0

It sounds like the client should use RFC6724 to sele= ct the best IPv6 address on a per-local-candidate basis, e.g., a different = remote address might be selected for a host candidate versus a relay candid= ate. Is that what was intended?

=C2=A0

= An IP
address SHOULD be used, but an FQDN MAY be used in place of an IP
address.=C2=A0 In that case, when receiving an offer or answer
containing an FQDN in an a=3Dcandidate attribute, the FQDN is looked
up in the DNS first using an AAAA record (assuming the agent
supports IPv6), and if no result is found or the agent only
supports IPv4, using an A record.=C2=A0 = The rules from section 6 of
[RFC6724] is followed by fixing the source address to be one from
the candidate pair to be matched against destination addresses
reported by FQDN, in cases where the DNS query returns more than
one IP address.

_______________________________________________
Ice mailing list
Ice@ietf.org
htt= ps://www.ietf.org/mailman/listinfo/ice

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SMTP id c196-v6mr3015299wmh.101.1532471770493; Tue, 24 Jul 2018 15:36:10 -0700 (PDT) MIME-Version: 1.0 References: <9fff0265a9394474b4a679901acd8841@ericsson.com> In-Reply-To: From: Peter Thatcher Date: Tue, 24 Jul 2018 15:35:58 -0700 Message-ID: To: Christer Holmberg Cc: Justin Uberti , "ice@ietf.org" Content-Type: multipart/alternative; boundary="00000000000082aae50571c6633e" Archived-At: Subject: Re: [Ice] Clarification on RFC 6724 text citation X-BeenThere: ice@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Interactive Connectivity Establishment \(ICE\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Jul 2018 22:36:15 -0000 --00000000000082aae50571c6633e Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, Jul 24, 2018 at 3:11 PM Christer Holmberg < christer.holmberg@ericsson.com> wrote: > Hi, > > > > >It depends on if you're talking about the signaled candidate or the > remote candidate used in the candidate pair. The signaled candidate can = be > a FQDN, so it >can have multiple IPs. But a candidate pair can only have > one IP on its remote end. > > > > In my opinion a candidate always have ONE IP addresses associated. I see > no difference about a signalled candidate or a remote candidate used in a > candidate pair =E2=80=93 it=E2=80=99s the same candidate. > > > > I do understand why one wants to use a FQDN in signalling =E2=80=93 but i= t is > still representing that one candidate, with that one associated IP addres= s. > A FQDN has more than on IP associated with it, so you have to pick one. We can debate what a "candidate" means, but it doesn't really matter. What matters is that when a FQDN is signaled, the agent has to pick an IP address. And the spec for when the picking is done and how it is done seems to have changed. > > > (Note that I am aware that this issue already exists in the MMUSIC draft, > so it was not introduced by the mDNS proposal.) > > > > > So we need a mapping from one to the other. The old mapping was "pick > one with unspecified behavior when you > > > receive the signaling and use it for all candidate pairs". The new > mapping seems to be "pick one when doing candidate > > > pairing using section 6 of RFC 6724 and each candidate pair may choose > a different one". > > > > If you get multiple addresses, and picks one (no matter what policy you > use for picking), there is no guarantee that the address you pick is the > address used be the remote peer for the candidate. Maybe the remote peer > doesn=E2=80=99t listen to that IP address. > If a host advertises/signals a FQDN, why would it not listen to each IP that FQDN resolves to? If you stick an IP in a DNS entry and don't listen to that IP, you're broken. Don't do that. > > > Or, as you saying that the peer signalling a candidate using a FQDN must > create local candidates for **each** IP address that the FQDN can resolve > to? > If you don't want to listen to more than one IP, don't make the FQDN resolve to more than one. If you do want to resolve the FQDN to more than one IP, listen to each IP. Seems pretty straightforward. > > > Regards, > > > > Christer > > > > > > > > > > On Tue, Jul 24, 2018 at 12:21 AM Christer Holmberg < > christer.holmberg@ericsson.com> wrote: > > Hi, > > > > A candidate is per definition associated with an IP address, so it sounds > confusing to me how a DNS query for a FQDN associated with that candidate > would return multiple addresses. > > > > Wouldn=E2=80=99t that mean that the FQDN represents multiple candidates (= one for > each returned IP address)? > > > > Regards, > > > > Christer > > > > *From:* Ice [mailto:ice-bounces@ietf.org] *On Behalf Of *Peter Thatcher > *Sent:* 23 July 2018 20:57 > *To:* Justin Uberti > *Cc:* ice@ietf.org > *Subject:* Re: [Ice] Clarification on RFC 6724 text citation > > > > I wasn't involved in writing that text, and it's in the MMUSIC WG, not th= e > ICE WG, but it does seem like the intention changed to what you are sayin= g. > > > > In 5245 that text was "If the DNS query returns more than one IP address, > one is chosen, and then used for the remainder of ICE processing." And t= he > text before it (in both 5245 and ice-sip-sdp) says "when receiving an > offer or answer". So it's clear that the 5245 intention was to make one > decision for a remote candidate and then apply that same one for all > candidate pairs with that remote candidate. > > > > But this text removes "for the remainder of ICE processing" and treats > 6724 section 6 as a function that takes two arguments: the remote > (destination) addresses *and *the local (source) address. Clearly doing > so could end up with different choices depending on the local (source) IP > address. So it seems intentional to allow each candidate pair to have a > different IP address even though they share the same remote candidate FQD= N. > > > > I find the new text confusing and think it would be more clear as > something like "If the DNS query returns more than one IP address, > followt the rules in section 6 of [RFC6274] for each local candidate by > using the address of the local candidate as the source address and the > addresses from the result of the DNS query as the list of destination > addresses. This may result in different candidate pairs having different > remote addresses even though they share the same remote candidate". > > > > If all of this is true and this change was intentional and the rules are > meant to be run for each local candidate, then I think trickle would need > to specify that such rules need to be applied whenever a new local > candidate is gathered, which means an implementation would need to rememb= er > the entire list of destination addresses until ICE processing is complete= . > > > > > > > > > > > > > > > > On Wed, Jul 18, 2018 at 7:40 AM Justin Uberti 40google.com@dmarc.ietf.org> wrote: > > The latest version of ice-sip-sdp contains the highlighted text below. I'= m > probably missing something that was previously discussed, but I couldn't > figure out what the "candidate pair" refers to. > > > > It sounds like the client should use RFC6724 to select the best IPv6 > address on a per-local-candidate basis, e.g., a different remote address > might be selected for a host candidate versus a relay candidate. Is that > what was intended? > > > > An IP > address SHOULD be used, but an FQDN MAY be used in place of an IP > address. In that case, when receiving an offer or answer > containing an FQDN in an a=3Dcandidate attribute, the FQDN is looked > up in the DNS first using an AAAA record (assuming the agent > supports IPv6), and if no result is found or the agent only > supports IPv4, using an A record. The rules from section 6 of > [RFC6724] is followed by fixing the source address to be one from > the candidate pair to be matched against destination addresses > reported by FQDN, in cases where the DNS query returns more than > one IP address. > > _______________________________________________ > Ice mailing list > Ice@ietf.org > https://www.ietf.org/mailman/listinfo/ice > > --00000000000082aae50571c6633e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Tue= , Jul 24, 2018 at 3:11 PM Christer Holmberg <christer.holmberg@ericsson.com> wrote:

Hi,

=C2=A0

<= div class=3D"m_4352162444009639476WordSection1">

>It depends on if you're talking about the si= gnaled candidate or the remote candidate used in the candidate pair.=C2=A0 = The signaled candidate can be a FQDN, so it >can have multiple IPs.=C2= =A0 But a candidate pair can only have one IP on its remote end.=C2=A0

=C2=A0

In = my opinion a candidate always have ONE IP addresses associated. I see no di= fference about a signalled candidate or a remote candidate used in a candid= ate pair =E2=80=93 it=E2=80=99s the same candidate.

=C2=A0

I do understand why one wants to use a FQDN in sign= alling =E2=80=93 but it is still representing that one candidate, with that= one associated IP address.

<= br>
A FQDN has more than on IP associated with it, so you have to= pick one.=C2=A0 We can debate what a "candidate" means, but it d= oesn't really matter.=C2=A0 What matters is that when a FQDN is signale= d, the agent has to pick an IP address.=C2=A0 And the spec for=C2=A0 when t= he picking is done and how it is done seems to have changed.
=C2= =A0

=C2=A0

(Note that I am aware that this issue already exist= s in the MMUSIC draft, so it was not introduced by the mDNS proposal.)

=C2=A0

> So we need a mapping from one to the other.=C2= =A0 The old mapping was "pick one with unspecified behavior when you

> receive the signaling and use it for all candidate pairs".=C2= =A0 The new mapping seems to be "pick one when doing candidate

> pairing using section 6 of RFC 6724 and each candidate pair may choo= se a different one".=C2=A0=C2=A0

=C2=A0

If = you get multiple addresses, and picks one (no matter what policy you use fo= r picking), there is no guarantee that the address you pick is the address = used be the remote peer for the candidate. Maybe the remote peer doesn=E2=80=99t listen to th= at IP address.


If a host advertises/signals a FQDN, why would it not listen to each IP th= at FQDN resolves to?=C2=A0 If you stick an IP in a DNS entry and don't = listen to that IP, you're broken.=C2=A0 Don't do that.=C2=A0=C2=A0<= /div>
=C2=A0

=C2=A0

Or, as you saying that the peer signalling a candid= ate using a FQDN must create local candidates for *each* IP address = that the FQDN can resolve to?


If you don't want to listen to more than one IP, don= 9;t make the FQDN resolve to more than one.=C2=A0 If you do want to resolve= the FQDN to more than one IP, listen to each IP.=C2=A0 Seems pretty straig= htforward.
=C2=A0

=C2=A0

Regards,

=

=C2=A0

Christer

=C2=A0

=C2=A0

=C2=A0

=C2=A0

On Tue, Jul 24, 2018 at 12:21 AM Christer Holmberg &= lt;chri= ster.holmberg@ericsson.com> wrote:

Hi,

=C2=A0

A candidate is per definition associa= ted with an IP address, so it sounds confusing to me how a DNS query for a FQDN associated with that candidate would return multiple addr= esses.

=C2=A0

Wouldn=E2=80=99t that mean that the F= QDN represents multiple candidates (one for each returned IP address)?

=C2=A0

Regards,

=C2=A0

Christer

=C2=A0

From: = Ice [mailto:ice-boun= ces@ietf.org] On Behalf Of Peter Thatcher
Sent: 23 July 2018 20:57
To: Justin Uberti <juberti=3D40google.com@dmarc.ietf.org>
Cc: ice@ietf.org
Subject: Re: [Ice] Clarification on RFC 6724 text citation=

=C2=A0

I wasn't involved in writing that text, and it&#= 39;s in the MMUSIC WG, not the ICE WG, but it does seem like the intention = changed to what you are saying.

=C2=A0

In 5245 that text was "If the DNS query returns= more than one IP address, one is chosen, and then used for the remainder o= f ICE processing."=C2=A0 And the text before it (in both 5245 and=C2=A0ice-sip-sdp) says "when receiv= ing an offer or answer".=C2=A0 So it's clear that the 5245 intenti= on was to make one decision for a remote candidate and then apply that same= one for all candidate pairs with that remote candidate.

=C2=A0

But this text removes = "for the remainder of ICE processing" and treats 6724 section 6 a= s a function that takes two arguments: the remote (destination) addresses and the local (source) address.=C2=A0 Clearly doing so co= uld end up with different choices depending on the local (source) IP addres= s.=C2=A0 So it seems intentional to allow each candidate pair to have a dif= ferent IP address even though they share the same remote candidate FQDN.

=C2=A0

I find the new text co= nfusing and think it would be more clear as something like=C2=A0&quo= t;If the DNS query returns more than one IP address, followt the rules in section 6 of [RFC6274] for each local candidate by using the addr= ess of the local candidate as the source address and the addresses from the= result of the DNS query as the list of destination addresses.=C2=A0 This m= ay result in different candidate pairs having different remote addresses even though they share the same remote c= andidate".

=C2=A0

If all of this is true and this change was intention= al and the rules are meant to be run for each local candidate, then I think= trickle would need to specify that such rules need to be applied whenever a new local candidate is gathered, which means an i= mplementation would need to remember the entire list of destination address= es until ICE processing is complete.

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0

=C2=A0

The latest version of ice-sip-sdp contains the highl= ighted text below. I'm probably missing something that was previously d= iscussed, but I couldn't figure out what the "candidate pair" refers to.

=C2=A0

It sounds like the client should use RFC6724 to sele= ct the best IPv6 address on a per-local-candidate basis, e.g., a different = remote address might be selected for a host candidate versus a relay candidate. Is that what was intended?

=C2=A0

= An IP
address SHOULD be used, but an FQDN MAY be used in place of an IP
address.=C2=A0 In that case, when receiving an offer or answer
containing an FQDN in an a=3Dcandidate attribute, the FQDN is looked
up in the DNS first using an AAAA record (assuming the agent
supports IPv6), and if no result is found or the agent only
supports IPv4, using an A record.=C2=A0 = The rules from section 6 of
[RFC6724] is followed by fixing the source address to be one from
the candidate pair to be matched against destination addresses
reported by FQDN, in cases where the DNS query returns more than
one IP address.

_______________________________________________
Ice mailing list
Ice@ietf.org
htt= ps://www.ietf.org/mailman/listinfo/ice

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