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List:       linux-virtual-server
Subject:    Re: ECN and hidden patch?
From:       Wensong Zhang <wensong () linux-vs ! org>
Date:       2004-11-11 14:57:25
Message-ID: Pine.LNX.4.44.0411112253050.1445-100000 () penguin ! linux-vs ! org
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Hi,

On Wed, 10 Nov 2004, Monty Ree wrote:

> Hello. all.
> 
> I setup LVS-DR (rr) with kernel 2.4.24 (Redhat 7.3)and works well.
> I patched "hidden patch" at  RealServer 1 and 2.
> 
>  LVS --------  RealServer 1  port 5000/tcp 
>        --------- RealServer 2   port 5000/tcp 
>  
> But after some hours, I can't connect the tcp port Realserver2.
> At that time, I executed tcpdump and like below.
> 
> 16:56:08.050143 211.157.175.145.53263 > 10.10.10.5.http: SWE
> 
> I found that  SWE instead of S, and according to this site 
> 
> http://www.in-addr.de/pipermail/lvs-users/2002-August/006358.html
> 
> set to "/proc/sys/net/ipv4/tcp_ecn" 0 solves this problem..
> But the value of the RealServer 2 is 0 and resetted.
> But I can't solve this problem.
> 
> I installed other kernel version, But I can't solve this problem either.
> Just lvs process restart can solve this problem... 
> 
> How can I solve this problem?
>  

I don't know how the hidden patch and ECN are related.

Please try to use other methods (such as arptables or noarp) to avoid the 
ARP problem in LVS/DR, and see if the problem still exists.

Regards,

Wensong

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