To:
dns op wg <dnsop@cafax.se>
From:
Randy Bush <randy@psg.com>
Date:
Thu, 20 Dec 2001 08:02:27 -0800
Sender:
owner-dnsop@cafax.se
Subject:
another iesg comment on draft-ietf-dnsop-hardie-shared-root-server-06.txt
The document doesn't seem to say anything about path MTU discovery (and potentially other ICMP error issues) for packets sent with an anycast source address. Since an ICMP "packet too big" will be sent back by a router to the anycast address it might not be delivered to the anycast member that actually sent the packet which might cause retransmissions with persistent packet loss. This fix is simply to point out that the responses from an anycast address must not use path MTU discovery i.e. must not have the DF bit set. I don't know of other ICMP errors that have similar issues.