[CentOS] CentOS5 Network Problems

Joshua Baker-LePain jlb17 at duke.edu
Thu Sep 20 23:49:21 UTC 2007

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

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