Date: Wed, 27 Dec 2006 22:08:25 -0800 From: "Stephan Wehner" <stephanwehner@gmail.com> To: "Matthew Hudson" <fbsd@synoptic.org> Cc: freebsd-net@freebsd.org Subject: Re: Diagnose co-location networking problem Message-ID: <e66d1efb0612272208l57e6649clf42127ed7ed85fdf@mail.gmail.com> In-Reply-To: <20061227221844.GA50395@gort.synoptic.org> References: <e66d1efb0612261845t3da246aepfa5ba5fef4858d6a@mail.gmail.com> <20061227221844.GA50395@gort.synoptic.org>
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Ok, this is a little unfortunate: I can't run traceroute from the client PC (the service provider doesn't seem to like it). (Nor can I use ping) The server FreeBSD kernel doesn't support tcpdump. I should recompile it then, but not now. So I ran the netstat tests, seeing no other suggestion. Below is the output before and after "failed" accesses. If I understand, there seems no indication of lost packets. At least the problem is rather reproducible: run 'lynx -dump http://stbgo.org > /dev/null' in a loop, 15 times and a failure occurs. I also thought maybe the ssh session might be interfering, rather than showing a live connection; but without it the same occurs. Thanks a lot to all for now. Stephan # Both on client and server: $ netstat -i > /tmp/before $ netstat -s | grep -i ret >> /tmp/before ... run test .... recognize failure ... $ netstat -i > /tmp/after $ netstat -s | grep -i ret >> /tmp/after Client first. $ cat /tmp/before Kernel Interface table Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg eth0 1500 012471498 0 0 0 8604916 36 0 1 BMRU eth0: 1500 0 - no statistics available - BMRU eth0: 1500 0 - no statistics available - BMRU lo 16436 0 429696 0 0 0 429696 0 0 0 LRU 66656 segments retransmited TCPLostRetransmit: 0 TCPFastRetrans: 1233 TCPForwardRetrans: 18 TCPSlowStartRetrans: 476 $ cat /tmp/after Kernel Interface table Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg eth0 1500 012471903 0 0 0 8605107 36 0 1 BMRU eth0: 1500 0 - no statistics available - BMRU eth0: 1500 0 - no statistics available - BMRU lo 16436 0 429786 0 0 0 429786 0 0 0 LRU 66665 segments retransmited TCPLostRetransmit: 0 TCPFastRetrans: 1233 TCPForwardRetrans: 18 TCPSlowStartRetrans: 476 Now server $ cat /tmp/before_server Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll bge0 1500 <Link#1> 00:0b:cd:4e:40:00 156342 3 146739 0 599 bge0 1500 65.110.18.136 df1 144448 - 145988 - - bge1* 1500 <Link#2> 00:0b:cd:4e:41:11 0 0 0 0 0 pflog 33208 <Link#3> 0 0 0 0 0 lo0 16384 <Link#4> 34545 0 34545 0 0 lo0 16384 your-net localhost.stephan 34454 - 34454 - - pfsyn 2020 <Link#5> 0 0 0 0 0 565 data packets (372083 bytes) retransmitted 38 data packets unnecessarily retransmitted 540 retransmit timeouts 156 retransmitted 0 invalid return addresses 0 no return routes $ cat /tmp/after_server Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll bge0 1500 <Link#1> 00:0b:cd:4e:40:00 156579 3 146957 0 599 bge0 1500 65.110.18.136 df1 144671 - 146206 - - bge1* 1500 <Link#2> 00:0b:cd:4e:41:11 0 0 0 0 0 pflog 33208 <Link#3> 0 0 0 0 0 lo0 16384 <Link#4> 34685 0 34685 0 0 lo0 16384 your-net localhost.stephan 34594 - 34594 - - pfsyn 2020 <Link#5> 0 0 0 0 0 565 data packets (372083 bytes) retransmitted 38 data packets unnecessarily retransmitted 540 retransmit timeouts 156 retransmitted 0 invalid return addresses 0 no return routes
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