Re: [Zenloadbalancer-support] Load balancing SMTP with Zen: source IP address information in Postfix logs

[Emilio C. <emi...@gm...>]

reply you inline.

2015-11-24 12:33 GMT+01:00 Marotta Lorenzo <lor...@re...>:

> Hello, greetings to everyone on the list.
>
>
>
> I’m trying to load balance SMTP traffic to a pair of Linux servers running
> postfix, and i have a couple of doubts about the implementation.
>
>
>
> First, i tried both a TCP and a L4xNAT type of farm (NAT mode) , which one
> is preferable?
>
>
L4xNAT is de candidate, TCP is deprecated.



>
>
> Secondly, i’ve seen that on the Postfix logs if the SMTP clients comes in
> thorught the Zen load balancer only the Zen machine IP address is logged;
> this way we loose the information about the sending SMTP client IP address
> and hostname. Is there any way to work around this issue?
>
>
>

It is because you are working with L4xNAT with NAT enabled, you should
configure DNAT mode, there is an explanation about NAT and DNAT in the
official documentation

http://www.zenloadbalancer.com/zlb-administration-guide-v305#L4xNATPROFILE_FARM

read about NAT and DNAT mode



> Maybe it is possible to configure some sort of logging on the Zen machine
> itself?
>

logging only recommended for troubleshooting, if you require to do that in
l4xnat profile then tcpdump is the trick.



>
>
> Thanks a lot, have a nice day!
>
> Lorenzo
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