Date: Sat, 26 Sep 1998 20:03:10 -0700 From: Ulf Zimmermann <ulf@Alameda.net> To: Ben Black <black@cypher.net>, dg@root.com, Tony Jones <tony@rtd.com> Cc: hackers@FreeBSD.ORG Subject: Re: TCP (http) problem Message-ID: <19980926200310.C27459@Alameda.net> In-Reply-To: <19980926204630.A20043@cypher.net>; from Ben Black on Sat, Sep 26, 1998 at 08:46:30PM -0400 References: <199809270000.RAA00288@zebedee.local> <199809270033.RAA17588@implode.root.com> <19980926204630.A20043@cypher.net>
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On Sat, Sep 26, 1998 at 08:46:30PM -0400, Ben Black wrote: > actually, this may be a bug in IIS4. i have seen a problem exactly as you > describe (can't get to certain sites, those running IIS4, but everything else > works fine) when the path MTU is not the same as the MTU on the IIS4 server's > LAN. > > since the smaller MTU hop was under my control, i increased the MTU and > everything worked. whether anyone upstream was blocking icmp messages used > in path MTU discovery, i don't know. But I doubt that altavista runs any IIS 4.x > > > ben > > On Sat, Sep 26, 1998 at 05:33:40PM -0700, David Greenman had most eloquently written: > > >Eventually the http connection will time out. > > > > > >I've upgraded -stable, the Linux version of Netscape to v4.06, tried my old > > >BSD Netscape 3.0 all with the same results. The BSD Netscape _used_ to work > > >fine, as did the Linux versions. > > > > > >I posted to -stable and someone suggested I disable TCP extensions (I'd already > > >tried this) and also to try sending large ICMP packets (1472) to see if it was > > >a fragmentation problem. The pings worked fine. > > > > It sounds like a problem with Path MTU Discovery. Your ISP is probably > > blocking outbound "ICMP_UNREACH_NEEDFRAG" messages. You might try setting > > a smaller MTU/MRU on your PPP connection (I suggest 552). > > > > -DG > > > > David Greenman > > Co-founder/Principal Architect, The FreeBSD Project > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > with "unsubscribe freebsd-hackers" in the body of the message > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message -- Regards, Ulf. --------------------------------------------------------------------- Ulf Zimmermann, 1525 Pacific Ave., Alameda, CA-94501, #: 510-769-2936 Alameda Networks, Inc. | http://www.Alameda.net | Fax#: 510-521-5073 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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