Re: [v6ops] I-D Action: draft-ietf-v6ops-6to4-to-historic-07.txt

[Brian E Carpenter <[e-mail]>]

On one specific point:

> So how about replacing;
> 
>    Internet service providers SHOULD filter out routes to 192.88.99.1.
> 
> With;
> 
>    All networks, but in particular Internet service providers, SHOULD
>    filter routes for 192.88.99.1 or the prefix 192.88.99.0/24, yet they
>    SHOULD NOT filter traffic sourced from or destine to 192.88.99.1. 

That doesn't quite work for me. Firstly, an edge network that chooses
(despite our advice) to use 6to4 shouldn't filter it, so I think it really
is a recommendation to ISPs. Secondly, if you're filtering the route, you
will drop packets TO 192.88.99.1 by definition. (I also think that mentioning
the /24 prefix is redundant.)

So my edit buffer now reads:

  Internet service providers SHOULD filter out routes to 192.88.99.1.
  However, networks SHOULD NOT filter out packets whose source address
  is 192.88.99.1, because this is normal 6to4 traffic from a 6to4
  return relay somewhere in the Internet.

      Brian