Re: [lvs-users] Load Balancer dropping requests

To: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] Load Balancer dropping requests
Cc: Horms <horms@xxxxxxxxxxxx>
From: Joseph Mack NA3T <jmack@xxxxxxxx>
Date: Wed, 9 Jul 2008 05:45:36 -0700 (PDT)
On Wed, 9 Jul 2008, Bruce Thompson wrote:

> We are seeing a problem whereby the LB's for LDAPs in our 
> performance test environment drop connections sometimes

if it's a timeout problem, the connection will be dropped 

> The problem is that the symptoms only appear under load 
> and long test runs.

what's "long" - more than 15mins?

> I noticed by reading the how-to that the default timeout 
> for a tcp connection is 15 minutes, if it hasn't received 
> tcpfin. Might I be better to set this to 12 hours instead?

sure. The timeout is incase a session somehow gets lost and 
allows ipvsadm to shed these connections. However the 
timeout seems to bight a lot of people. I wonder if it 
mightn't be better to have the timeout at something like 
24hrs. The ipvsadm table would have to carry dead 
connections for 24hrs, but I don't think that would be a big 

        Do you think it would be sensible to change the 


Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at
Homepage It's GNU/Linux!

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