Subject: [MOBILE-IP] A Question on draft-ietf-mobileip-ipv6-12.txt

From: Ra Chen <[email-masked]>
Date: Tue, 20 Jun 2000 15:57:52 +0800

In Page 24, it is mentioned that a Bindnig Update option
MAY include an Alternate Care-of Address sub-option,
and the address in the Alternate Care-of Address sub-option
is used for binding, instead of the Source Address of the IP header.

Our question is, when is it necessary to use this sub-option?
In what situation should a mobile node decide not to put the care-of address
it is going to use in the Source Address field, but put it in the sub-option
and use another address as the Source Address?

Thanks for clarifying.

Ra