[CentOS] CentOS based router dropping connections

Jesse Cantara jesse_cantara at esupport.com
Mon Jul 23 18:39:41 UTC 2007

Actually, I spoke too soon.

Setting the NIC to 100 Mbit did not fix the issue, I just happened to 
misdiagnose a fix, because it seemed to be working for quite some time, 
but it is back to the old problems.

Basically, I'm at wits end right now. I'm going to go down to the 
colocation and see if they can test the network drop into our cabinet. 
If it's not that, then I'm convinced it's the tg3 driver.


Jesse Cantara wrote:
> The problem ended up being the "tg3" Broadcom NIC kernel module driver. 
> It doesn't work properly at Gigabit speeds. Turning it down to 100 
> Megabit fixed the issue. Does anybody know where I should report this bug?
> Thanks for all your help,
> -Jesse
> William L. Maltby wrote:
>> On Fri, 2007-07-20 at 12:29 -0400, Jesse Cantara wrote:
>>> Hi Bob,
>>> <snip>
>>> The issue I'm having is that external traffic is being forwarded 
>>> properly, BUT that it drops the connection occasionally. It's not 
>>> consistent (maybe 2 out of 5 downloads from the internet through the 
>>> router to the webserver will drop), and the connections are being 
>>> made, so it's not a fundamental configuration issue. It's something 
>>> more sneaky. I'm thinking that there's something in the kernel or 
>>> network driver that isn't functioning properly, or maybe a buffer 
>>> that is becoming full and abandoning the connection?
>>> <snip>
>>> -Jesse
>>> Bob Chiodini wrote:
>>>> Jesse Cantara wrote:
>>>>> Hello,
>>>>> I am trying to figure out a problem I'm having using CentOS on a 
>>>>> machine as a router. The short story is: any traffic routed through 
>>>>> the router seems to get disconnected at random occasionally.
>>>>> <snip>
>> Someone recently posted a thread about a similar complaint to the lists
>> recently. IIRC, the [SOLVED] post mentioned a problem with MTU being
>> smaller than some of the packets received at one point, causing
>> fragmentation, and the next step not being to reassemble the packet
>> because of a certain flag being set.
>> I don't remember which bit the flag was and no little about this, but I
>> remember the general gist.
>> Maybe your problem is similar?
>> HTH
>> -- 
>> Bill
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