network stalls on Fedora Core 3
Keith Fetterman
kfetterman at go2marine.com
Fri Apr 22 21:58:04 UTC 2005
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?
Thanks,
Keith
--
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Keith Fetterman 206-780-5670
Mariner Supply, Inc. kfetterman at go2marine.com
http://www.go2marine.com
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