-----Original Message----- From: Christopher Morrow [mailto:[email protected]] Sent: Wednesday, August 25, 2010 1:11 AM To: Hemant Singh (shemant) Cc: Shane Amante; [email protected]; [email protected] Subject: Re: 6man discussion on /127 document @ IETF78
>Hemant, shane's point is that there is no default route in his >network, there are no default routes in lots of networks. having one >suddenly appear is a super extra bad thing, trust me, i've done it... >people get very angry when a few million packets per second arrive all >of a sudden... I can believe you but such bad things also depend upon what else is configured for routing on each of the two router in the p2p network that can prevent the bad things. >Also, in the scenario, what makes routerA the 'default' ? what makes routerB? who decides? how is that decision made? is it deterministic? across all vendors and across all implementations inside a >single vendor? (I'm looking at you XR|IOS]CatOS|wifi-crap-os... and to befair: JunOS|E) Ah, such an implementation so does not exist anywhere in the industry. We are just discussing a point brought up in 6man at IETF 78 related to off-link that generated this new router internals discussion. As for your question, IPv6 ND RA from routerB telling routerA that router B is its default router. Conversely, routerA is routerB's default router via IPv6 ND RA from routerA received by routerB. >to echo 3 other people... this is a very bad plan. If you put a /127 >on a ptp link all it ever is is 2 addresses that are part of a very >small (2 host-addr) subnet. it doesn't need nor want anything like RA >or ND on it. We are in agreement. See my email from last night where I was trying to explain to some folks who had challenged that ND and RA cannot be used in a p2p link. I am saying it can be, but as we all see it as not necessary. I also said, the RA example was to explain IPv6 ND off-link model which ends up sending data to the default router. Anyway, the IPv6 ND off-link model was for router internals. The off-link model internally in the router can still send traffic to the other router without any default router configured because the other end is the /127 directly connected from A to B. Hemant -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
