From: Victor Duchovni (Victor.DuchovniMorganStanley.com)
Date: Wed Jan 02 2008 - 17:39:56 CST

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On Thu, Jan 03, 2008 at 12:33:13AM +0100, mouss wrote:

> > We are using a Cisco CSS and Postfix v2.2.
> > Do you mean that the load balancer should not use XCLIENT command in order
> > not to change the original e-mail sender IP? Or maybe should sender use
> > XCLIENT command?
> > I looked for it in http://www.postfix.org/XCLIENT_README.html but I don't
> > understand how it affects in this scenario.
> >
>
> if the load balancer implements the XCLIENT command (by sending it with
> infos on the original client), then postfix would get the IP.

The load balancer we do this with can have a customizable conversation
with the server before it yields control to the client.

        Client->LB: Connect
        LB->Server: Connect, wait for banner
        Server->LB: 220 ...
        LB->Server: XCLIENT ADDR=...
        Server->LB: 250 ...
        LB->Client: 220 ...
        ... LB yields connection to client ...

various error handling ...

--
        Viktor.

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