Date: Fri, 01 Feb 2002 07:29:59 -0800 From: Michael Sierchio <kudzu@tenebras.com> To: Alexey Luckyanchikov <alexl@alkar.net> Cc: freebsd-stable@freebsd.org, freebsd-net@freebsd.org Subject: Re: Weird path MTU autodiscovery problem in 4.5-RELEASE Message-ID: <3C5AB477.3000304@tenebras.com> References: <20020201125326.GA3036@alkar.net>
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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-net" in the body of the message
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