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Re: network stalls on Fedora Core 3

I checked /proc/sys/net/ipv4/tcp_ecn and it was set to 0.

After I checked that, I decided to run tcpdump on the remote server and the workstation that is having the problem. What I discovered is that after the stall occurs, I can see the workstation sending a TCP request to the server. I then see the remote server sending a response back to the workstation, but the response TCP packet is never displayed by tcpdump on the workstation. After a short pause, I see the workstation sending the same packet again.

Now, I am sure the response packet is getting to the workstation because it was receiving data from the server. Is it possible the the workstation is dropping the response packet?

Les Mikesell wrote:
On Fri, 2005-04-15 at 12:57, Keith Fetterman wrote:

You are not going to believe this. The problem also exists in this version of Ubuntu. The only common thread that I can see is between these two Linux OS's is the 2.6 kernel. Ubuntu is essentially Debian underneath. I did a uname -r on the Ubuntu system. The kernel is: 2.6.10-5-386

Can this be a problem with explicit congestion notification?
If /proc/sys/net/ipv4/tcp_ecn is not 0, it is a possibility.

-- ----------------------------------------------------------------- Keith Fetterman 206-780-5670 Mariner Supply, Inc. kfetterman go2marine com http://www.go2marine.com

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