Date: Thu, 14 Jul 2005 12:46:11 +0900 From: gnn@freebsd.org To: Jeremie Le Hen <jeremie@le-hen.org> Cc: freebsd-net@freebsd.org Subject: Re: Problem with Path MTU Discovery Message-ID: <m2mzoqt5h8.wl%gnn@neville-neil.com> In-Reply-To: <20050713130042.GV39292@obiwan.tataz.chchile.org> References: <20050713130042.GV39292@obiwan.tataz.chchile.org>
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At Wed, 13 Jul 2005 15:00:42 +0200, Jeremie Le Hen wrote: > > Hi, > > I set a gif(4)-based IPSec tunnel between my network and a friend's one. > This works pretty well, except that Path MTU Discovery doesn't work. > > Quick draw: > MTU: 1500 MTU:1280 MTU:1500 > Comp1 --------- Gate1 -------- Gate2 -----+-- Comp2 > RELENG_5 RELENG_4 RELENG_5 | RELENG_5 > | > +-- Comp3 > RELENG_5 > Can you look at the routing table for each of Comp1 and Comp2 and also use the -W flag to show the path MTU? If there is something wonky in the routing table then TCP will not hear about the MTU change. Thanks, George
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