I have a very odd problem connecting to some websites from my CentOS 5 box Target websites: www.connecttech.com www.3ware.com (two of my HW vendors) I can usually get some kind of response, but if the content (download or page itself) is larger in size (downloads never pass 100K), then it hangs... When I fire-up wireshark, I get a lot of ougoing highlighted Checksum Errored packets but I don't know what's causing it... Here's what I've eliminated thus far: - Websites are up and responsive - Cable(s) is fine - Network drop is fine - I put myself behind a firewall to make sure it wasn't my network - Network card has been switched - Driver has been switched - Removed any firewall - wget has problems as well - Other computers on the same network work fine. Sites like maps.google.com work just fine... I'm open to any suggestion at this point. I'm completely lost. - G.
semi linux wrote:> I have a very odd problem connecting to some websites from my CentOS 5 box > > Target websites: > www.connecttech.com > www.3ware.com > (two of my HW vendors) > > I can usually get some kind of response, but if the content (download > or page itself) is larger in size (downloads never pass 100K), then it > hangs... > > When I fire-up wireshark, I get a lot of ougoing highlighted Checksum > Errored packets but I don't know what's causing it... Here's what > I've eliminated thus far: > > - Websites are up and responsive > - Cable(s) is fine > - Network drop is fine > - I put myself behind a firewall to make sure it wasn't my network > - Network card has been switched > - Driver has been switched > - Removed any firewall > - wget has problems as well > - Other computers on the same network work fine. > > Sites like maps.google.com work just fine... I'm open to any > suggestion at this point. > > I'm completely lost. > > - G. > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centosWhen you say network drop is fine does that mean from the switch to your computer? Have you tried a different port on your switch? -- James A. Peltier Technical Director, RHCE SCIRF | GrUVi @ Simon Fraser University - Burnaby Campus Phone : 604-291-3610 Fax : 604-291-3045 Mobile : 778-840-6434 E-Mail : jpeltier at cs.sfu.ca Website : http://gruvi.cs.sfu.ca | http://scirf.cs.sfu.ca MSN : subatomic_spam at hotmail.com
semi linux spake the following on 9/20/2007 4:31 PM:> I have a very odd problem connecting to some websites from my CentOS 5 box > > Target websites: > www.connecttech.com > www.3ware.com > (two of my HW vendors) > > I can usually get some kind of response, but if the content (download > or page itself) is larger in size (downloads never pass 100K), then it > hangs... > > When I fire-up wireshark, I get a lot of ougoing highlighted Checksum > Errored packets but I don't know what's causing it... Here's what > I've eliminated thus far: > > - Websites are up and responsive > - Cable(s) is fine > - Network drop is fine > - I put myself behind a firewall to make sure it wasn't my network > - Network card has been switched > - Driver has been switched > - Removed any firewall > - wget has problems as well > - Other computers on the same network work fine. > > Sites like maps.google.com work just fine... I'm open to any > suggestion at this point. > > I'm completely lost. > > - G.Have you eliminated interference from electrical sources? Tried another computer on that cable? -- MailScanner is like deodorant... You hope everybody uses it, and you notice quickly if they don't!!!!
On Thu, 20 Sep 2007 at 4:31pm, semi linux wrote> I have a very odd problem connecting to some websites from my CentOS 5 box > > Target websites: > www.connecttech.com > www.3ware.com > (two of my HW vendors) > > I can usually get some kind of response, but if the content (download > or page itself) is larger in size (downloads never pass 100K), then it > hangs...I had an odd issue with an FC6 laptop on a hotel wireless network where any encrypted traffic (ssh, https) would hang after a certain amount. The fix was to turn off TCP window scaling (echo 0 > /proc/sys/net/ipv4/tcp_window_scaling). Some googling revealed that some routers have issues with TCP window scaling - I don't know why it only affected encrypted traffic in my case, but the fix may be worth a shot for you. -- Joshua Baker-LePain QB3 Shared Cluster Sysadmin UCSF