Alain, -----Original Message----- From: Alain Durand [mailto:[email protected]] Sent: Tuesday, August 24, 2010 12:54 PM To: Hemant Singh (shemant) Cc: Christian Huitema; prevention; [email protected] Subject: Re: Router redirects in Node Requirements document
>1) To answer your point, I do not think there is a need for redirect in a cable network. Everything goes through the CMTS anyway. Not quite. Did you happen to see this example I sent out on 08/14/2010 on this thread? [For example, see this cable modem deployment. Two hosts are sitting behind a bridged cable modem. A switch behind the cable modems connects the two hosts. Each host acquires a global IPv6 address using DHCPv6 and the cable access concentrator (a CMTS - cable modem termination system) serving the cable modem sent an RA to the modem and the hosts with no PIO (Prefix Information Option). Such a RA signals to the hosts to send traffic to the default router (the CMTS). Now host, H1 sends traffic destined to host, H2 to the CMTS. During DHCPv6, the CMTS DHCPv6 relay agent gleaned the fact that H2's is using a cable modem, CM1 (based on L2 cable control that uses a Service ID, SID). Likewise, the CMTS also knows H1 is behind CM1. So when a packet sent from H1 destined for H2 arrives at the CMTS (also the first hop IPv6 router), the CMTS issues a Redirect to H1 to communicate directly with H2.] >2) Even if redirect could be useful in such a leaf network, it would not change my overall point. This is not an argument to mandate it >mandatory to implement for ALL networks. So are you asking for the text like this to change from MUST to SHOULD? "A router MUST implement Redirect functionality" Or are you OK with the MUST in the quoted sentence directly above and would like to see a MUST implement and SHOULD NOT enable by default? Thanks, Hemant PS: I hope you are settled in VA now after your move from PA. -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
