Re: [PATCH] Transparent proxy support for LVS with localnode and realser

To: LVS Devel <lvs-devel@xxxxxxxxxxxxxxx>
Subject: Re: [PATCH] Transparent proxy support for LVS with localnode and realservers (WORKING) (fwd)
From: Joseph Mack NA3T <jmack@xxxxxxxx>
Date: Thu, 10 Jan 2008 06:51:42 -0800 (PST)
Hi Raphael,

I didn't see lvs-devel on the cc list. Hope you don't mind if I forward this.


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

---------- Forwarded message ----------
Date: Thu, 10 Jan 2008 15:14:23 +0100
From: Raphael Vallazza <raphael@xxxxxxxxxx>
To: Joseph Mack NA3T <jmack@xxxxxxxx>
Subject: Re: [PATCH] Transparent proxy support for LVS with localnode and
    realservers (WORKING)


i wrote a very simple patch for ipvs that enables a kernel config option that allows to choose where IPVS intercepts incoming connections. These are the options:
- LOCAL_IN (default: works as usual)
- PRE_ROUTING (puts LVS input right after the mangle PREROUTING and before the nat PREROUTING chain)

neat. I thought it was hard enough to move that it wouldn't be just an option :-)

Hehe, yes, it was pretty easy ;)

what we'd really like is ipvs hooked into the FORWARD chain. Can you do this too?

To be honest i don't understand the reason for hooking LVS into the FORWARD chain, because this way it would not get the LOCAL_IN traffic and at the same time it would have the same NAT problem as with the LOCAL_IN hook. Maybe i'm missing something, but it seems that PREROUTING is the best point for LVS to act like a real router, because it gets packets that haven't been NATed yet. The only negative thing is that traffic can't be filtered in a regular way, but using fwmark and the mangle table the user can select the traffic that has to be handled by LVS.

If you like i can also add this option, but i'm not sure if it's really useful :)

I tried it on some test boxes and it seems to work pretty well, i'll do some stress testing in the next few days. I could send you a setup example if you like...

yes please

Ok, i'll try to write a short document/example ASAP.



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