Subject: [MOBILE-IP] inquiry

From: Hany Milika <[email-masked]>
Date: Mon, 17 Apr 2000 07:24:26 +0200

Hi everyone
in RFC 2002, section "1.3. Assumptions", third paragraph, it was stated that: This protocol assumes that IP unicast datagrams are routed based on the destination address in the datagram header (and not, for example,   by source address).

I actually didn't got what is meant by that.. actually i don't kbnow of routing technique based on source address? or this was said to exclude firewalls, and such things that would be on the way of unicast datagrams routing?.. 
hope it's not a silly enquiry.....anyway, i'm still new to this :)