On Thu, 2 Jan 2003, Kenneth Maupin wrote:

> Hi,
>
> We're designing a new mail system which sits behind a load balancer.
> One component of this system is a set of hosts dedicated to queuing
> mail for domains to which we offer secondary MX. Our intent is to use
> the load balancer to present a single routable IP address to the
> outside world regardless of how many hosts reside behind it. The
> queuing hosts are configured with non-routable IP addresses visible to
> the load balancer only. Domains for which we offer secondary MX will

I a word "proxy_interfaces". Supported in Postfix 2.0. Upgrade if
necessary.

Another alternative to use Layer 2 load-balancing and configure the shared
virtual ip as a loopback IP address on each of the physical machines. They
won't ARP for the shared IP (because it is a secondary address for the
loopback interface), but they will process traffic for this IP if the
load-balancer knows how to do Layer 2 redirection.

I use Cisco's LocalDirector in "dispatch" mode to preserve the
destination IP address. No problems to report.

-- 
	Viktor.
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