Re: [lvs-users] LVS-NAT dropping connection occasionally at random

To: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] LVS-NAT dropping connection occasionally at random
From: Jesse Cantara <jesse_cantara@xxxxxxxxxxxx>
Date: Mon, 23 Jul 2007 11:32:20 -0400
Tobias, thanks for the information.

The device on my machine is the Broadcom BCM5721, and the reason why I 
decided that the driver was at fault is because I found somebody else 
online with the same problem and that particular model of Broadcom NIC.

Also to re-update the situation, setting it to 100 mbit didn't 
permanently fix the situation, it just made the occurrances of the 
problem happen less so I misdiagnosed it as fixed :(

Do you have any advice as to what to look for more in-depth?

I have replaced some of the switching hardware, but not all of it. The 
reason why I don't think it is the switch or cables is because direct 
system-to-system communication works just fine, it's only when I'm doing 
any sort of packet-forwarding (with lvs-nat or just simple iptables 


Tobias Klausmann wrote:
> Hi! 
> On Mon, 23 Jul 2007, Jesse Cantara wrote:
>> Just a followup: it is definitely a driver issue. The tg3 broadcom 
>> kernel module doesn't seem to work properly at gigabit speeds. 100 mbit 
>> works fine (which is OK in this situation).
> Then I'd look into the matter more closely. We use about 1k
> machines with tg3 chips, some 500 of them in farms using GE links
> and have had no hiccups whatsoever (beyond the usual amount of
> simply broken hardware which was replaced). CErtainly no
> systemativ error.
> Regards,
> Tobias
> PS: Don't forget that your switching infrastructure might be at
> fault, too.

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