Date: Thu, 14 Aug 1997 22:51:07 +0200 (MEST) From: Søren Schmidt <sos@sos.freebsd.dk> To: jkh@time.cdrom.com (Jordan K. Hubbard) Cc: wollman@FreeBSD.ORG, current@FreeBSD.ORG Subject: Re: Well, I guess it's about time I mentioned this little problem... Message-ID: <199708142051.WAA06701@sos.freebsd.dk> In-Reply-To: <1433.871583550@time.cdrom.com> from "Jordan K. Hubbard" at "Aug 14, 97 11:32:30 am"
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In reply to Jordan K. Hubbard who wrote: > David G. and I poked around at the problem a bit during a recent phone > conversation of ours, but nothing really came to mind as a solution. > > Here's the scenario: > > Box G, a FreeBSD 3.0-current machine, contains an SMC ethernet card > configured as ed0 and a standard serial port with a ISDN Terminal > Adaptor running at 115.2KBaud and configured as sl0. This slip line > goes to another ISDN TA which is plugged into hub.freebsd.org, > everything on that side configured pretty much the same way. > > Box A, a FreeBSD 2.2-stable machine, talks to box G over its own PCI > NIC, configured as de0. Box G is configured as this machine's default > gateway and it's your basic, standard "n machines on a LAN being > served by one gateway machine with an ISDN connection" situation. > > Now here's where it gets weird. By and large, everything works just > fine on this LAN and the FreeBSD/ISDN machine has been serving rather > happily in this role for over a year. The only flies in the ointment > have been certain URLs which just never seemed to be reachable from > Box A, whether the browser was Netscape or Lynx or whatever. At first > I just wrote this off to the flakey nature of the net in general, but > then I started getting suspicious when I noticed that these "stubborn > URLs" actually worked just fine from Box G or from hub.freebsd.org, it > just failed to work from Box A. During my conversation with David, he > suggested that I drop the MTU on box A's ethernet interface from 1500 > to 500 and TADA! Suddenly these URLs (one of which is > http://www.sunlabs.com/) could be visited just fine from box A, no > problems. Looks an awfull lot like the problem I have with running cvsup.. Wheneven I try my gateway machine (2.2.2) gets hosed at just lets avery other tcp packet through :(, setting the MTU lower helps but does not entirely cure the problem. I'm using userlevel ppp though so there is a bit difference... -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Søren Schmidt (sos@FreeBSD.org) FreeBSD Core Team Even more code to hack -- will it ever end ..
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