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Re: network stalls on Fedora Core 3

Shawn Iverson wrote:

I have similar problems over a Linksys (BEFSR11) router.

Using Ethereal, I discovered a problem where I think the FC3 system is not recovering from receiving a bad TCP packet. When the FC3 system receives a bad TCP packet, it sends s response to the remote server requesting it to resend the packet. The remote server does, but then the FC3 system sends the request again for the same packet. It does this several times and then gives up. I don't think the FC3 OS is processing the resent packet properly so it retries several before eventually giving up on with the download. The lower level OS return doesn't fail, it just stops responding, which is why from scp level it looks like a stall.

My symptoms as you describe them are exactly what I see happening in
Ethereal, although you are going over a T1 while I am going over a cable
modem.  However, it is not the cable modem or its connection that is at
fault.  Something is astray between the Linksys router and FC3, and it
isn't the cabling because I can connect the FC3 box directly to the
cable modem and it then functions.  I wonder if there is any correlation
here that could point to the source of the problem.  Do you connect
through a router before your CSU/DSU to your T1 line?

Yes. Here is the actual components between the FC3 computer and the T1:

- FC3 computer to
- Linksys EtherFast 4124 switch to
- Cisco 1700 router (connected to the 10/100 port) T1 is connected to a CSU/DSU module in the router)

Does anyone have any idea why the FC3 OS might be having this problem and what I can do or who to report the problem too?

I believe that the problem is related to either a kernel setting or the
driver.  Is it possible to "transplant" the NIC driver from RHEL3 to see
if this resolves the issue?  I would think that it would only involve
copying over the kernel module for your NIC.  Also, how do the kernel
settings for TCP/IP differ between RHEL3 and FC3?  Go to
/proc/sys/net/ipv4 on each system and compare.  I will try this out this
weekend if time permits.

I went to /proc/sys/net/ipv4 directory and there are a bunch of files in there. Is there someway to get a formatted result (without programming one :)) of these parameters so I can easily compare them?


Keith Fetterman                          206-780-5670
Mariner Supply, Inc.                     kfetterman go2marine com

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