To:
Patrik Fältström <paf@cisco.com>
cc:
dnsop@cafax.se
From:
Bruce Campbell <bruce.campbell@ripe.net>
Date:
Mon, 4 Nov 2002 19:58:04 +0100 (CET)
In-Reply-To:
<7588BEEC-F00C-11D6-868E-0003934B2128@cisco.com>
Sender:
owner-dnsop@cafax.se
Subject:
Re: DoS and anycast
On Mon, 4 Nov 2002, [ISO-8859-1] Patrik Fältström wrote: > On måndag, nov 4, 2002, at 16:28 Europe/Stockholm, Randy Bush wrote: > > > second, as many of us have repeatedly said, routing of anycast > > addresses has to be appropriately scoped, as it has to be today. > > it would be useful to have a discussion of 'appropriately' if we > > could stop ratholing on other issues. > > I thought I had a very specific question? > > Default route for ISP A is to B, for B is to C. If C _internally_ have > a copy of the IP address 1.2.3.4 for it's own use, will traffic from B > to C reach that server, or the real 1.2.3.4 which is at D which B ask C > to transit traffic to? Ok. Assuming that C's transit routers listen to C's internal routing, then traffic to 1.2.3.4 from A will be directed to C:1.2.3.4, not D:1.2.3.4 . This is probably the most-likely case. If C have Clue++, and have directed their transit routers to _not_ listen to that specific internal announcement, then traffic from outside of C will go (as non-C customers expect) to D:1.2.3.4 . Traffic from C's customers (etc) will always go to C:1.2.3.4 . --==-- Bruce. #---------------------------------------------------------------------- # To unsubscribe, send a message to <dnsop-request@cafax.se>.