Date: Mon, 12 Aug 2002 17:30:08 -0700 From: Jeff Behl <jeff@expertcity.com> To: net@freebsd.org Subject: MTU not working? Message-ID: <3D585310.8010709@expertcity.com>
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We're seeing something odd that is seriously impacting our service for some clients. Even though a the box seems to have the correct MTU in the routing table, it doesn't seem to follow it in all cases. dell350-12.snv#sysctl -a | grep mtu net.inet.tcp.path_mtu_discovery: 1 dell350-12.snv#uname -a FreeBSD dell350-12.snv 4.4-RELEASE FreeBSD 4.4-RELEASE #0: Fri Aug 2 03:24:36 PDT 2002 root@dell350-12.snv:/usr/src/sys/compile/COMMS44-2 i386 dell350-12.snv#netstat -rnal | grep 10.4.1.134 10.4.1.134 63.xxx.224.129 UGHW 1 2268 1420 fxp0 but tcpdump shows: 17:21:43.497275 63.xxx.224.154.80 > 10.4.1.134.2314: . 1:1461(1460) ack 248 win 17520 (DF) 17:21:51.497212 63.xxx.224.154.80 > 10.4.1.134.2314: . 1:1461(1460) ack 248 win 17520 (DF) 17:22:07.497065 63.xxx.224.154.80 > 10.4.1.134.2314: . 1:1461(1460) ack 248 win 17520 (DF) obviosly the packet isn't making it back to the client as it's too big. any ideas? I don't see any bug reports on it. We believe the same situation exsits with a 4.6 server but I haven't checked that thorougly enough yet. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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