On Mon, 2010-08-02 at 16:18 +0100, David Woodhouse wrote:
> On Mon, 2010-08-02 at 11:11 +0100, Sujit Acharyya-Choudhury wrote:
> > We are experiencing trouble in sending e-mails to certain sites from
> our Exim Gateway, which is 4.60. We don't know whether it is exim or
> our firewall which is causing the problem. Ordinary e-mail goes
> through, but e-mail with attachments fail:
> >
> > Below is an example:
> >
> > Site Shakespearesglobe.com
> > Our site: westminster.ac.uk (gateways, isls-mx10, isls-mx20,
> isls-mx30)
> >
> > Shakespearesglobe.com says:
> > "MTU size is currently set at 1404. Our communication line is a
> 10MB Managed Internet Line. We don't experience any problems
> communicating with any other organisations with our current MTU size.
> How have you resolved this problem with other organisations?"
> >
> > We at isls-mx30, compiled exim with 4000 MTU, but that failed to
> solve the problem.
> >
> > Any body has seen the problem like this before?
>
> It looks like you're firewalling ICMP. Don't do that; it breaks
> things.
I note you're still firewalling ICMP.
I'm guessing that you haven't solved the problem yet? Or have you made
your firewall only *slightly* less broken, so it's not filtering
'fragmentation needed' but is still filtering 'echo re{quest,ply}'?
--
David Woodhouse Open Source Technology Centre
David.Woodhouse@??? Intel Corporation
