LVS-NAT Setup

[Mansoor Ali]

Greetings

I have setup the LVS based on LVS-NAT configuration. When outside host tries 
to access the Real Servers than they are going through the Virtual IP 
successfully. When Real Servers originate the traffic to the outside host 
than it is not going through the Virtual IP. On my router i see that the 
traffic is coming from the IP of Real Host.
Does anyone help in this regard. I want the every traffic coming in or going 
out must go through the Virtual IP.

Mansoor

>From: lvs-users-request at LinuxVirtualServer.org
>Reply-To: lvs-users at LinuxVirtualServer.org
>To: lvs-users at LinuxVirtualServer.org
>Subject: lvs-users Digest, Vol 50, Issue 11
>Date: Mon, 12 Mar 2007 12:00:03 +0100 (CET)
>
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>Today's Topics:
>
>    1. Re: Quiescent server connections (Adrian Chapela)
>    2. Re: Quiescent server connections (Janusz Krzysztofik)



>From: Adrian Chapela <achapela.rexistros at gmail.com>
>Reply-To: "LinuxVirtualServer.org users mailing 
>list."<lvs-users at LinuxVirtualServer.org>
>To: "LinuxVirtualServer.org users mailing 
>list."<lvs-users at LinuxVirtualServer.org>
>Subject: Re: Quiescent server connections
>Date: Mon, 12 Mar 2007 08:36:54 +0100
>Ben Hollingsworth escribió:
>>OK, so I've got my setup nailed down pretty well.  This is pair of squid
>>web proxies on a 2-host LVS running UltraMonkey / HB 2.0.7-8 on RHEL4
>>(2.6.9).  I'm struggling with one more thing, though.  With
>>quiescent=true, if I shut down squid on one box, connections from new
>>hosts fail over to the other box just fine, but connections from
>>persistent hosts keep going to the same, dead box.  I realize this is as
>>
>
>OK, to solve the problem there are two variables:
>
>/proc/sys/net/ipv4/vs/expire_nodest_conn --> to expire connections before 
>the protocol timeout. This is to solve the problem when a server goes down. 
>For example in the UDP protocol the protocol timeout is too high.
>
>/proc/sys/net/ipv4/vs/expire_quiescent_template --> this variable I think 
>is the variable to solve your problem. With this you timeout your 
>persistent template when a server goes down.
>
>I don't know what them makes exactly but the first solve my problems. You 
>could make a test.
>
>Best regards.
>>intended.  If I set quiescent=false, all client communication with the
>>dead box ceases immediately, which includes cutting off active
>>connections at the knees.  That's not an issue if the squid actually
>>dies.  However, most of our failovers will be due to my own planned
>>maintenance.  In that case, I'd like to allow existing connections
>>(which may be lengthy downloads) to finish before sending new requests
>>(even from persistent clients) to the live box.  I can't find any way to
>>do this without hacking the kernel to match a 2-yr-old patch that Horms
>>published (assuming that even applies to my setup).  Most of the info
>>about this seems to have been written three years ago.  Is there a way
>>to make this work without a custom compile?
>>
>>   
>>------------------------------------------------------------------------
>>
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>





>From: Janusz Krzysztofik <jkrzyszt at tis.icnet.pl>
>Reply-To: "LinuxVirtualServer.org users mailing 
>list."<lvs-users at LinuxVirtualServer.org>
>To: "LinuxVirtualServer.org users mailing 
>list."<lvs-users at linuxvirtualserver.org>
>Subject: Re: Quiescent server connections
>Date: Mon, 12 Mar 2007 11:33:39 +0100
>Dnia sobota, 10 marca 2007 00:24, Ben Hollingsworth napisał:
> > OK, so I've got my setup nailed down pretty well.  This is pair of squid
> > web proxies on a 2-host LVS running UltraMonkey / HB 2.0.7-8 on RHEL4
> > (2.6.9).  I'm struggling with one more thing, though.  With
> > quiescent=3Dtrue, if I shut down squid on one box, connections from new
> > hosts fail over to the other box just fine, but connections from
> > persistent hosts keep going to the same, dead box.
>
>I have one solution, but it works only in case of transparent proxy setup.
>Instead of persistance, use lblc scheduler (without persistance). lblc 
>itself
>gives you some kind of persistance of 6 minutes or more. If 6 minutes is 
>not
>enough for you, please look here:
>http://kb.linuxvirtualserver.org/wiki/Talk:Locality-Based_Least-Connection_Scheduling
>
>Cheers,
>Janusz






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