network stalls on Fedora Core 3

[Keith Fetterman]

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



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