To:
randy@psg.com (Randy Bush)
Cc:
dnsop@cafax.se (dns op wg)
From:
Ted Hardie <hardie@oakthorn.com>
Date:
Thu, 20 Dec 2001 09:56:25 -0800 (PST)
In-Reply-To:
<E16H5eN-000FtJ-00@rip.psg.com> from "Randy Bush" at Dec 20, 2001 08:02:27 AM
Reply-to:
hardie@oakthorn.com
Sender:
owner-dnsop@cafax.se
Subject:
Re: another iesg comment on draft-ietf-dnsop-hardie-shared-root-server-06.txt
I'll add this to the document. To be honest, I have never seen an implementation that would do this after getting a udp DNS request, but I so no harm in including the advice. regards, Ted > > 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. >