Date: Wed, 2 Dec 1998 09:36:05 -0700 From: Nate Williams <nate@mt.sri.com> To: Daniel Eischen <eischen@vigrid.com> Cc: nate@mt.sri.com, dillon@apollo.backplane.com, hackers@FreeBSD.ORG, luigi@labinfo.iet.unipi.it Subject: Re: TCP bug Message-ID: <199812021636.JAA06068@mt.sri.com> In-Reply-To: <199812021626.LAA27156@pcnet1.pcnet.com> References: <199812021626.LAA27156@pcnet1.pcnet.com>
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> > No, 10% of machines out on the big bad Internet don't work. (I'm > > guessing at the 10% number. It may be higher/lower, but about 10% of > > the sites I try to contact don't work.) > > > > 90% of the sites *OUTSIDE MY NETWORK* that I attempt to contact on these > > internal machines work, and all of my network machines can talk to one > > another. > > OK, I got it now ;-) > > > > If you sit at the router, can you ping those systems (assuming > > > they can be pinged)? > > > > If I sit on the machine who can't make the WWW connections I can ping > > the remote sites if they haven't blocked out ICMP packets to me. I > > simply can't make TCP connections to them. > > That's pretty strange. So the router can't make TCP connections to > these sites either? 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... Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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