nanog mailing list archives
Re: PMTU and Broken Servers
From: Leo Bicknell <bicknell () ufp org>
Date: Thu, 8 May 2003 11:18:27 -0400
In a message written on Thu, May 08, 2003 at 11:12:19AM -0400, Jeff McAdams wrote:
An only slightly better hack would be to have the tunnel and/or firewall twiddle the MSS on outgoing TCP connections to compensate for the lower tunnel MTU. Still pretty gross, but won't have as much of an effect on the TCP performance.
I did leave out some details. We tried Cisco code that mucks with MSS, and that part worked but the image had other issues for us. :( Of course, I'm also highly annoyed that you can't raise the MTU on a Cisco tunnel. You can raise the MTU on T1's, so you can add the tunnel overhead, but you can't then raise the MTU of the tunnel itself. In a couple cases we could make it so the tunnel had an MTU of 1500 if we could change it. *sigh* -- Leo Bicknell - bicknell () ufp org - CCIE 3440 PGP keys at http://www.ufp.org/~bicknell/ Read TMBG List - tmbg-list-request () tmbg org, www.tmbg.org
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Current thread:
- Re: PMTU and Broken Servers, (continued)
- Re: PMTU and Broken Servers bdragon (May 10)
- Re: PMTU and Broken Servers Curtis Maurand (May 12)
- Re: PMTU and Broken Servers Stephen J. Wilcox (May 12)
- Re: PMTU and Broken Servers Stephen Sprunk (May 12)
- Re: PMTU and Broken Servers Niels Bakker (May 13)
- Re: PMTU and Broken Servers Curtis Maurand (May 12)
- Re: PMTU and Broken Servers Stephen J. Wilcox (May 12)
- Re: PMTU and Broken Servers Curtis Maurand (May 12)
- Re: PMTU and Broken Servers Stephen J. Wilcox (May 12)
- Re: PMTU and Broken Servers Leo Bicknell (May 08)
- Re: PMTU and Broken Servers Mikael Abrahamsson (May 08)
- Re: PMTU and Broken Servers Leo Bicknell (May 08)
- Re: PMTU and Broken Servers Mikael Abrahamsson (May 08)
- Re: PMTU and Broken Servers Richard A Steenbergen (May 08)
- Re: PMTU and Broken Servers Marc Binderberger (May 10)
- RE: PMTU and Broken Servers Hank Nussbacher (May 12)