GNU bug report logs - #23547
debbugs.gnu.org MTU / icmp black hole issue

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Package: debbugs.gnu.org;

Reported by: snabb <at> epipe.com

Date: Mon, 16 May 2016 02:51:02 UTC

Severity: normal

Done: Bob Proulx <bob <at> proulx.com>

Bug is archived. No further changes may be made.

Full log

Message #10 received at 23547 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: snabb <at> epipe.com
Cc: 23547 <at> debbugs.gnu.org
Subject: Re: bug#23547: debbugs.gnu.org MTU / icmp black hole issue
Date: Mon, 16 May 2016 03:24:39 -0400

> After researching with tcpdump and ping it appears that this server is
> using or is behind a network which uses MTU which is smaller than normal
> but it is not advertising that correctly in TCP MSS and not informing
> the client about blackholed backets with icmp. The advertised TCP MSS
> value is too high. Packets that big end up in a black hole and the email
> delivery TCP connection stalls. There may be some icmp blackholing
> involved as well.

Thanks for the report.
Sadly, I only understand about one word in three, so I have no idea what
to do to fix this. :(
Can anyone help?
This bug report was last modified 9 years and 9 days ago.

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