Date: Wed, 2 Dec 1998 21:57:30 +0100 From: Guido van Rooij <guido@gvr.org> To: Nate Williams <nate@mt.sri.com>, Daniel Eischen <eischen@vigrid.com> Cc: dillon@apollo.backplane.com, hackers@FreeBSD.ORG, luigi@labinfo.iet.unipi.it Subject: Re: TCP bug Message-ID: <19981202215730.B23018@gvr.org> In-Reply-To: <199812021636.JAA06068@mt.sri.com>; from Nate Williams on Wed, Dec 02, 1998 at 09:36:05AM -0700 References: <199812021626.LAA27156@pcnet1.pcnet.com> <199812021636.JAA06068@mt.sri.com>
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On Wed, Dec 02, 1998 at 09:36:05AM -0700, Nate Williams wrote: > No, the router can, but any machines hung off it's ethernet can't. On a > whim (based on a hint I got from Karl Peilorz) I changed the MTU on the > router (which is running SLIP to get to the net) from 552 to 1500, and > now things work. > > The strange things is that that the mtu of the SLIP interface if/was 552 > and all traffic that originated on that box was fine, and the mtu on the > ethernet interface was 1500, and traffic generated from there did not > work. > > I would have thought that you wouldn't need to fragment any packets that > had a mtu of 552 to stick it on an ethernet with an mtu of 1500. > > I need to lookmore into this... In my previous mail I already stated why things can go wrong if the www server on the internet has a badly configured packet filter. In your case it seems that your router is badly configured. Does it filter out ICMP ICMP_UNREACH_NEEDFRAG pakcets from the ethernet to the ouside, but not from your router to the outside? -Guido To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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