Date: Thu, 8 May 1997 12:39:18 -0700 (PDT) From: Tom Samplonius <tom@sdf.com> To: Bill Fenner <fenner@parc.xerox.com> Cc: Shawn Carey <smc@servtech.com>, "Daniel O'Callaghan" <danny@panda.hilink.com.au>, freebsd-hackers@freebsd.org Subject: Re: FTP Performance Message-ID: <Pine.NEB.3.94.970508123846.12735A-100000@misery.sdf.com> In-Reply-To: <97May8.111829pdt.177486@crevenia.parc.xerox.com>
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On Thu, 8 May 1997, Bill Fenner wrote: > Tom Samplonius <tom@sdf.com> wrote: > > How would this misconfiguration occur? Just two routers with > >mis-matched MTU/MRU sizes? > > No, the only way for PMTU discovery to fail is for a router to not > return ICMP fragmentation required errors. I don't know how to > configure a router to do this, since it's required by RFC1812, > but perhaps there's a firewall in the way. > > Bill Yes, many sites block most if not all ICMP. Any way to disable mtu detection? Tom
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