Ethereal-users: RE: [Ethereal-users] Extremely strange network problem - 3com Sup erstack 3
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From: "Beaumont, Kevin" <kevin.beaumont@xxxxxxxxxxxxx>
Date: Mon, 31 Oct 2005 15:44:28 -0000
Hi Joe, I thought this at first, but to clarify the switch port is set to 1gb/full duplex, and client is using 1gb/full duplex: bradfordmon:~# dmesg | grep NIC e1000: eth0: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex Not returning any network errors, either: bradfordmon:~# ifconfig eth0 Link encap:Ethernet HWaddr 00:0D:56:88:96:01 inet addr:10.3.0.50 Bcast:10.255.255.255 Mask:255.255.0.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:209731 errors:0 dropped:0 overruns:0 frame:0 TX packets:6279 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:36675953 (34.9 MiB) TX bytes:1082923 (1.0 MiB) Base address:0xdf40 Memory:feae0000-feb00000 Thanks, Kevin -----Original Message----- From: ethereal-users-bounces@xxxxxxxxxxxx [mailto:ethereal-users-bounces@xxxxxxxxxxxx] On Behalf Of Joe Elliott Sent: 31 October 2005 15:43 To: Ethereal user support Subject: Re: [Ethereal-users] Extremely strange network problem - 3com Superstack 3 Hello Kevin, Whenever I see problems like this I immediately suspect the switch negotiation settings. I have run into this situation a number of times where a new switch cannot correctly negotiate with a client the correct speed to communicate. The server sets the speed at 100M/b full duplex and the client 100Ms/s half duplex. The connection still works but the actual throughput drops to around 1Mb/s and has a lot of CRC errors. Look for errors on the switch for that specific port and check the port speed setting at both ends of the wire. I remember one client who had this problem with his new Cat5500 megabuck switch and I increased performance 10x by replacing the whole switch with a 16 port NetGear hub from Frys! Of course we fixed the problem and put the switch back in the end, but its a simple test to do. Let me know how it works out ... Joe. -- __o _~o __o "Know your Network" `\<, `\<, `\<, ______________________________________(*)/_(*)__(*)/_(*)__(*)/_(*)________ Im a 21st Century Digital Boy ... I aint got a life, but I got lotsa toys. *************** Joe Elliott joe@xxxxxxxxx AOL:xqos ******************** - NetContExt - sniffer trace forensics - tcp follow stream analysis - - Extract data files and Images from tcpdump & ethereal packet payloads - Inetd.Com Network analysis solutions http://www.inetd.com -------------------------------------------------------------------------- On Mon, 31 Oct 2005, Beaumont, Kevin wrote: > Date: Mon, 31 Oct 2005 15:27:59 -0000 > From: "Beaumont, Kevin" <kevin.beaumont@xxxxxxxxxxxxx> > Reply-To: Ethereal user support <ethereal-users@xxxxxxxxxxxx> > To: "'Ethereal-users@xxxxxxxxxxxx'" <Ethereal-users@xxxxxxxxxxxx> > Subject: [Ethereal-users] Extremely strange network problem - 3com > Superstack 3 > > Guys, > > We've recently installed some new 3com Superstack 3 equipment. Since then, > we're sporadically seeing some systems unable to access certain network > services. Some times it is fine. > > Example - we have a Debian 3.1 box which currently can not use apt-get. It > was working earlier today. It works elsewhere on the network on another > Debian 3.1 box. > > Following is a tcpdump of everything going to our proxy server > (10.1.255.244) from our debian box in question (10.3.0.50). > > If anybody has *ANY* suggestions please let me know. I feel like I'm > banging my head against a brick wall as this is obviously causing a lot of > grief. The "nop, nop,sack sack 1" status of the packets interests me. > > Can supply packet dumps from a different internal network from a box > successfully using apt-get via the same proxy server if required (the > different network uses Procurve equipment). > > > -- > > 16:00:52.326569 IP (tos 0x0, ttl 64, id 45017, offset 0, flags [DF], > length: 56) 10.3.0.50.32805 > 10.1.255.244.www: S [tcp s > um ok] 4191353099:4191353099(0) win 5840 <mss 1460,sackOK,timestamp 546514 > 0> > 16:00:52.331592 IP (tos 0x0, ttl 64, id 56096, offset 0, flags [DF], > length: 56) 10.3.0.50.32806 > 10.1.255.244.www: S [tcp s > um ok] 4201090547:4201090547(0) win 5840 <mss 1460,sackOK,timestamp 546515 > 0> > 16:00:52.340840 IP (tos 0x0, ttl 120, id 56803, offset 0, flags [DF], > length: 60) 10.1.255.244.www > 10.3.0.50.32805: S [tcp s > um ok] 2869593484:2869593484(0) ack 4191353100 win 65535 <mss > 1460,nop,nop,timestamp 0 0,nop,nop,sackOK> > 16:00:52.340854 IP (tos 0x0, ttl 64, id 45018, offset 0, flags [DF], > length: 52) 10.3.0.50.32805 > 10.1.255.244.www: . [tcp s > um ok] 1:1(0) ack 1 win 5840 <nop,nop,timestamp 546516 0> > 16:00:52.341042 IP (tos 0x0, ttl 64, id 45019, offset 0, flags [DF], > length: 644) 10.3.0.50.32805 > 10.1.255.244.www: P 1:593 > (592) ack 1 win 5840 <nop,nop,timestamp 546516 0> > 16:00:52.348458 IP (tos 0x0, ttl 120, id 56808, offset 0, flags [DF], > length: 60) 10.1.255.244.www > 10.3.0.50.32806: S [tcp s > um ok] 381206461:381206461(0) ack 4201090548 win 65535 <mss > 1460,nop,nop,timestamp 0 0,nop,nop,sackOK> > 16:00:52.348462 IP (tos 0x0, ttl 64, id 56097, offset 0, flags [DF], > length: 52) 10.3.0.50.32806 > 10.1.255.244.www: . [tcp s > um ok] 1:1(0) ack 1 win 5840 <nop,nop,timestamp 546517 0> > 16:00:52.348650 IP (tos 0x0, ttl 64, id 56098, offset 0, flags [DF], > length: 1155) 10.3.0.50.32806 > 10.1.255.244.www: P 1:11 > 04(1103) ack 1 win 5840 <nop,nop,timestamp 546517 0> > 16:00:52.579185 IP (tos 0x0, ttl 120, id 56908, offset 0, flags [DF], > length: 52) 10.1.255.244.www > 10.3.0.50.32805: . [tcp s > um ok] 1:1(0) ack 593 win 64943 <nop,nop,timestamp 66762833 546516> > 16:00:52.579311 IP (tos 0x0, ttl 120, id 56909, offset 0, flags [DF], > length: 52) 10.1.255.244.www > 10.3.0.50.32806: . [tcp s > um ok] 1:1(0) ack 1104 win 64432 <nop,nop,timestamp 66762833 546517> > 16:00:52.648767 IP (tos 0x0, ttl 120, id 56929, offset 0, flags [DF], > length: 407) 10.1.255.244.www > 10.3.0.50.32806: P 1:356 > (355) ack 1104 win 64432 <nop,nop,timestamp 66762833 546517> > 16:00:52.648774 IP (tos 0x0, ttl 64, id 56099, offset 0, flags [DF], > length: 52) 10.3.0.50.32806 > 10.1.255.244.www: . [tcp s > um ok] 1104:1104(0) ack 356 win 6432 <nop,nop,timestamp 546547 66762833> > 16:00:52.669629 IP (tos 0x0, ttl 120, id 56933, offset 0, flags [DF], > length: 1500) 10.1.255.244.www > 10.3.0.50.32805: . 345: > 1793(1448) ack 593 win 64943 <nop,nop,timestamp 66762833 546516> > 16:00:52.669640 IP (tos 0x0, ttl 64, id 45020, offset 0, flags [DF], > length: 64) 10.3.0.50.32805 > 10.1.255.244.www: . [tcp s > um ok] 593:593(0) ack 1 win 5840 <nop,nop,timestamp 546549 > 66762833,nop,nop,sack sack 1 {345:1793} > > 16:01:01.332227 IP (tos 0x0, ttl 120, id 57694, offset 0, flags [DF], > length: 64) 10.1.255.244.www > 10.3.0.50.32805: . [tcp s > um ok] 1449:1461(12) ack 593 win 64943 <nop,nop,timestamp 66762921 546549> > 16:01:01.332234 IP (tos 0x0, ttl 64, id 45021, offset 0, flags [DF], > length: 72) 10.3.0.50.32805 > 10.1.255.244.www: . [tcp s > um ok] 593:593(0) ack 1 win 5840 <nop,nop,timestamp 547415 > 66762833,nop,nop,sack sack 2 {1449:1461}{345:1793} > > 16:01:01.372076 IP (tos 0x0, ttl 120, id 57699, offset 0, flags [DF], > length: 396) 10.1.255.244.www > 10.3.0.50.32805: P 1:345 > (344) ack 593 win 64943 <nop,nop,timestamp 66762921 547415> > 16:01:01.372081 IP (tos 0x0, ttl 64, id 45022, offset 0, flags [DF], > length: 52) 10.3.0.50.32805 > 10.1.255.244.www: . [tcp s > um ok] 593:593(0) ack 1793 win 6432 <nop,nop,timestamp 547419 66762921> > 16:01:05.919550 IP (tos 0x0, ttl 120, id 58417, offset 0, flags [DF], > length: 64) 10.1.255.244.www > 10.3.0.50.32806: . [tcp s > um ok] 1804:1816(12) ack 1104 win 64432 <nop,nop,timestamp 66762967 546547> > 16:01:05.919557 IP (tos 0x0, ttl 64, id 56100, offset 0, flags [DF], > length: 64) 10.3.0.50.32806 > 10.1.255.244.www: . [tcp s > um ok] 1104:1104(0) ack 356 win 6432 <nop,nop,timestamp 547874 > 66762833,nop,nop,sack sack 1 {1804:1816} > > 16:01:09.215822 IP (tos 0x0, ttl 120, id 59320, offset 0, flags [DF], > length: 1500) 10.1.255.244.www > 10.3.0.50.32805: . 1793 > :3241(1448) ack 593 win 64943 <nop,nop,timestamp 66763000 547419> > 16:01:09.215827 IP (tos 0x0, ttl 64, id 45023, offset 0, flags [DF], > length: 52) 10.3.0.50.32805 > 10.1.255.244.www: . [tcp s > um ok] 593:593(0) ack 3241 win 8688 <nop,nop,timestamp 548203 66763000> > 16:01:16.416228 IP (tos 0x0, ttl 120, id 60160, offset 0, flags [DF], > length: 64) 10.1.255.244.www > 10.3.0.50.32806: . [tcp s > um ok] 1804:1816(12) ack 1104 win 64432 <nop,nop,timestamp 66763072 547874> > 16:01:16.416236 IP (tos 0x0, ttl 64, id 56101, offset 0, flags [DF], > length: 72) 10.3.0.50.32806 > 10.1.255.244.www: . [tcp s > um ok] 1104:1104(0) ack 356 win 6432 <nop,nop,timestamp 548923 > 66762833,nop,nop,sack sack 2 {1804:1816}{1804:1816} > > 16:01:20.912610 IP (tos 0x0, ttl 120, id 60430, offset 0, flags [DF], > length: 64) 10.1.255.244.www > 10.3.0.50.32805: . [tcp s > um ok] 4689:4701(12) ack 593 win 64943 <nop,nop,timestamp 66763117 548203> > 16:01:20.912615 IP (tos 0x0, ttl 64, id 45024, offset 0, flags [DF], > length: 64) 10.3.0.50.32805 > 10.1.255.244.www: . [tcp s > um ok] 593:593(0) ack 3241 win 8688 <nop,nop,timestamp 549373 > 66763000,nop,nop,sack sack 1 {4689:4701} > > 16:01:29.227806 IP (tos 0x0, ttl 120, id 62842, offset 0, flags [DF], > length: 64) 10.1.255.244.www > 10.3.0.50.32805: . [tcp s > um ok] 4689:4701(12) ack 593 win 64943 <nop,nop,timestamp 66763200 549373> > 16:01:29.227811 IP (tos 0x0, ttl 64, id 45025, offset 0, flags [DF], > length: 72) 10.3.0.50.32805 > 10.1.255.244.www: . [tcp s > um ok] 593:593(0) ack 3241 win 8688 <nop,nop,timestamp 550205 > 66763000,nop,nop,sack sack 2 {4689:4701}{4689:4701} > > 16:01:42.891463 IP (tos 0x0, ttl 120, id 393, offset 0, flags [DF], length: > 64) 10.1.255.244.www > 10.3.0.50.32806: . [tcp sum > ok] 1804:1816(12) ack 1104 win 64432 <nop,nop,timestamp 66763336 548923> > 16:01:42.891470 IP (tos 0x0, ttl 64, id 56102, offset 0, flags [DF], > length: 72) 10.3.0.50.32806 > 10.1.255.244.www: . [tcp s > um ok] 1104:1104(0) ack 356 win 6432 <nop,nop,timestamp 551571 > 66762833,nop,nop,sack sack 2 {1804:1816}{1804:1816} > > 16:01:48.368094 IP (tos 0x0, ttl 120, id 2475, offset 0, flags [DF], length: > 64) 10.1.255.244.www > 10.3.0.50.32806: . [tcp su > m ok] 3264:3276(12) ack 1104 win 64432 <nop,nop,timestamp 66763391 551571> > 16:01:48.368101 IP (tos 0x0, ttl 64, id 56103, offset 0, flags [DF], > length: 72) 10.3.0.50.32806 > 10.1.255.244.www: . [tcp s > um ok] 1104:1104(0) ack 356 win 6432 <nop,nop,timestamp 552119 > 66762833,nop,nop,sack sack 2 {3264:3276}{1804:1816} > > 16:01:50.249326 IP (tos 0x0, ttl 64, id 45026, offset 0, flags [DF], > length: 64) 10.3.0.50.32805 > 10.1.255.244.www: F [tcp s > um ok] 593:593(0) ack 3241 win 8688 <nop,nop,timestamp 552307 > 66763000,nop,nop,sack sack 1 {4689:4701} > > 16:01:50.249446 IP (tos 0x0, ttl 64, id 56104, offset 0, flags [DF], > length: 72) 10.3.0.50.32806 > 10.1.255.244.www: F [tcp s > um ok] 1104:1104(0) ack 356 win 6432 <nop,nop,timestamp 552307 > 66762833,nop,nop,sack sack 2 {3264:3276}{1804:1816} > > 16:01:50.281873 IP (tos 0x0, ttl 120, id 3105, offset 0, flags [DF], length: > 1500) 10.1.255.244.www > 10.3.0.50.32805: . 4689: > 6137(1448) ack 594 win 64943 <nop,nop,timestamp 66763410 552307> > 16:01:50.281887 IP (tos 0x0, ttl 64, id 20, offset 0, flags [DF], length: > 40) 10.3.0.50.32805 > 10.1.255.244.www: R [tcp sum > ok] 4191353693:4191353693(0) win 0 > --- > > Non-working apt-get log: > > -- > bradfordmon:~# apt-get update > Get:1 http://security.debian.org stable/updates/main Packages [137kB] > Get:2 http://ftp.uk.debian.org stable/main Packages [3347kB] > Err http://security.debian.org stable/updates/main Packages > Connection timed out > Hit http://security.debian.org stable/updates/main Release > Err http://ftp.uk.debian.org stable/main Packages > Connection timed out > Hit http://ftp.uk.debian.org stable/main Release > Hit http://ftp.uk.debian.org stable/main Sources > Hit http://ftp.uk.debian.org stable/main Release > Failed to fetch > http://ftp.uk.debian.org/debian/dists/stable/main/binary-i386/Packages.gz > Connection timed out > Failed to fetch > http://security.debian.org/dists/stable/updates/main/binary-i386/Packages.gz > Connection timed out > Reading Package Lists... Done > W: Couldn't stat source package list http://ftp.uk.debian.org stable/main > Packages > (/var/lib/apt/lists/ftp.uk.debian.org_debian_dists_stable_main_binary-i386_P > ackages) - stat (2 No such file or directory) > W: You may want to run apt-get update to correct these problems > E: Some index files failed to download, they have been ignored, or old ones > used instead. > --- > > Working apt-get log: > > -- > liverpoolmon:~# apt-get update > Hit http://ftp.uk.debian.org stable/main Packages > Hit http://ftp.uk.debian.org stable/main Release > Hit http://security.debian.org stable/updates/main Packages > Hit http://ftp.uk.debian.org stable/main Sources > Hit http://security.debian.org stable/updates/main Release > Hit http://ftp.uk.debian.org stable/main Release > Reading Package Lists... Done > --- > > > Thanks, > > Kevin > > > **************************************************************************** ********** > The information contained in this e-mail is private and confidential, may > be legally privileged and/or protected by law and it is intended only for > the use of the addressee. > Any liability (in negligence or otherwise) arising from any third party > taking any action or refraining from taking any action on any of the > information contained in this e-mail is hereby excluded. If you are not > the intended recipient please notify the sender immediately. > Do not disclose the contents to any other person store or copy the > information in any medium or use it for any purpose whatsoever. > Copyright in this e-mail and any attachment created by us belongs to this > company and we assert the right to be identified as such and object to any > misuse. > Any contract concluded by means of e-mail communications is expressly > concluded subject to Princes Limited's current standard terms and conditions. > A copy of these is available on request. > **************************************************************************** ********** > > _______________________________________________ > Ethereal-users mailing list > Ethereal-users@xxxxxxxxxxxx > http://www.ethereal.com/mailman/listinfo/ethereal-users > _______________________________________________ Ethereal-users mailing list Ethereal-users@xxxxxxxxxxxx http://www.ethereal.com/mailman/listinfo/ethereal-users ************************************************************************************** The information contained in this e-mail is private and confidential, may be legally privileged and/or protected by law and it is intended only for the use of the addressee. Any liability (in negligence or otherwise) arising from any third party taking any action or refraining from taking any action on any of the information contained in this e-mail is hereby excluded. If you are not the intended recipient please notify the sender immediately. Do not disclose the contents to any other person store or copy the information in any medium or use it for any purpose whatsoever. Copyright in this e-mail and any attachment created by us belongs to this company and we assert the right to be identified as such and object to any misuse. Any contract concluded by means of e-mail communications is expressly concluded subject to Princes Limited's current standard terms and conditions. A copy of these is available on request. **************************************************************************************
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