-----Original Message----- From: Jared Mauch [mailto:[email protected]] Sent: Monday, August 16, 2010 12:50 PM To: Hemant Singh (shemant) Cc: Randy Bush; ipv6 deployment prevention; Wes Beebee (wbeebee) Subject: Re: Router redirects in Node Requirements document
>So it's a non-issue and they don't need the redirects in this case it seems. No, it is an issue. Did you see my email for the detailed use case that two neighboring homes with two different bridged cable modems have to talk to each other throught the SP first hop router (CMTS). But the redirect example I gave was for two hosts behind the same cable modem in the same home - when one host sent traffic to the other via the SP first hop router, the router HAD to send a Redirect! >Just because someone can poorly manage their network doesn't mean you should be advocating it. I'm not sure I see any operational "win" here. If you step outside the CMTS world, you typically have >better defined subnets/masks on devices running IOS/XR/XE/JunOS/JunOS-E/NxOS even when the device is acting as a DHCP server doing ND RA (vs lots of diverse subnets coming in; biz vs consumer vs voip). Even outside of the CMTS world, soon as one has a LAN network with more than one router, one can easily see a need for Redirect - google for so many examples of LAN networks where Redirect is used. Also, the examples for other OS and vendors and DHCP server in the same router is all moot - the same router sends the ND RA and the DHCPv6 server will not send the prefix len in DHCPv6 responses. Again, summary to the mailer: I still haven't seen any justification for changing the "MUST implement Redirect functionality by a router" - there are sufficient use cases and needs and also DoS issue with Redirect is weak reason to change the MUST. Now, it's only SHOULD enable by default or not that needs debate. For the 3rd time, since RFC 2461, router vendors enable Redirect by default. Howsoever folks may thrash one cannot ignore legacy. So why do we have to thrash so much and just agree to the SHOULD enable by default? Hemant -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
