re: some further musings
Craig Partridge <craig@NNSC.NSF.NET> Tue, 05 December 1989 17:06 UTC
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To: smb@research.att.com
Cc: mtudwg
Subject: re: some further musings
Date: Tue, 05 Dec 1989 12:05:04 -0500
From: Craig Partridge <craig@NNSC.NSF.NET>
> First: is it really necessary to reprobe for MTU changes, once the > initial negotiation is complete? Route changes are comparatively > infrequent, and many -- most? -- routing changes will not affect the > MTU. Steve: I think you are making two separate points here: (1) Do we need to probe very often? Your answer (and mine) is no. Once you know the MTU, you shouldn't have to check it very often because the path shouldn't change. (2) Are the MTUs very diverse? If not, again, you shouldn't need to probe often. I object to question (2) on philosophical grounds. IP is intended to run over diverse networks, and we should assume the MTU varies widely, even if it doesn't in practice. (Indeed, given FDDI MTUs and Jacobson's small MTUs [256byte if I remember right] for his header-compressed SLIP links I think MTU varies quite widely in practice too). Craig
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