Date: Thu, 10 Feb 2000 20:46:46 -0500 (EST) From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> To: Stephen Macmanus <stephenm@windriver.com> Cc: freebsd-net@FreeBSD.ORG Subject: Path MTU discovery cutoff Message-ID: <200002110146.UAA44355@khavrinen.lcs.mit.edu> In-Reply-To: <200002102308.PAA18465@brisbane.wrs.com> References: <200002102308.PAA18465@brisbane.wrs.com>
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<<On Thu, 10 Feb 2000 15:08:02 -0800 (PST), Stephen Macmanus <stephenm@windriver.com> said: > RFC 1191 specifies a minimum path MTU estimate of 68 bytes for a > participating host. The FreeBSD 3.4 implementation uses a cutoff > of 296 bytes. Why does it have a larger minimum? Because when I felt that the RFC-specified minimum was unreasonably small, and if people want to have links with tiny MTUs then they should bear the costs themselves. It's also protection against a PMTU-DoS attack. -GAWollman -- Garrett A. Wollman | O Siem / We are all family / O Siem / We're all the same wollman@lcs.mit.edu | O Siem / The fires of freedom Opinions not those of| Dance in the burning flame MIT, LCS, CRS, or NSA| - Susan Aglukark and Chad Irschick To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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