Date: Fri, 01 Feb 2002 10:50:53 -0500 From: "Louis A. Mamakos" <louie@TransSys.COM> To: Michael Sierchio <kudzu@tenebras.com> Cc: Alexey Luckyanchikov <alexl@alkar.net>, freebsd-stable@FreeBSD.ORG, freebsd-net@FreeBSD.ORG Subject: Re: Weird path MTU autodiscovery problem in 4.5-RELEASE Message-ID: <200202011550.g11Forp17319@whizzo.transsys.com> In-Reply-To: Your message of "Fri, 01 Feb 2002 07:29:59 PST." <3C5AB477.3000304@tenebras.com> References: <20020201125326.GA3036@alkar.net> <3C5AB477.3000304@tenebras.com>
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Is the server filtering out ICMP traffic with ipfw or something? > Alexey Luckyanchikov wrote: > > > > 14:06:48.477578 server.7 > client.1371: . 1437:2897(1460) ack 10001 win 65535 (DF) (ttl 64, id 25428, len 1500) > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > Server send packet with size 1500 bytes > > > > 14:06:48.682558 router > server: icmp: client unreachable - need to frag (mtu 1476) for server.7 > client.1371: [|tcp] (DF) (ttl 61, id 25428, len 1500) (ttl 253, id 2491, len 56) > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > Router say to server that he must to decrease packet size > > > > 14:07:04.477857 server.7 > client.1371: . 1437:2897(1460) ack 10001 win 65535 (DF) (ttl 64, id 52781, len 1500) > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > But server ignore this information and still send 1500 bytes packets > > > What's the result of 'sysctl net.inet.tcp.path_mtu_discovery' ?? Not that > I can imagine, at the moment, what would set it to 0.... > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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