Re: Cisco pix MTU problem, was RE: [Exim] Exchange, HELO and…

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Author: Tabor J. Wells
Date:  
To: Alan J. Flavell
CC: Exim users list
Subject: Re: Cisco pix MTU problem, was RE: [Exim] Exchange, HELO and underscores
On Fri, Jun 27, 2003 at 01:13:40PM +0100,
Alan J. Flavell <a.flavell@???> is thought to have said:

> On Fri, 27 Jun 2003, Cory Daehn wrote:
>
> > If enough of their mail bounces, they'll fix it.
>
> That's easily said, but we're currently struggling with a different
> problem (Cisco pix MTU munging) where we're being accused of being
> the ONLY site that cannot send mail to them. So although there is
> even documentary evidence that they are the ones at fault, they don't
> seem interested in fixing it.


I seem to recall seeing this once upon a time. IIRC the remote site was
being too agressive blocking all of the types of ICMP rather than just echo
reply. The right fix would be for them to be more sane about what ICMP types
they block.

I also seem to recall that I was able to work around it by either increasing
or decreasing the DELIVER_OUT_BUFFER_SIZE parameter in Local/Makefile and
rebuilding. Alas this was a job ago so I don't have the build files or
details about what I did any longer.

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Tabor J. Wells                                     twells@???
Fsck It!                 Just another victim of the ambient morality