Suppose, I have 3 mail servers @ DMZ zone with one real ip. the situation
as before?
in that case, What can I do?
your could use exim/postfix and route the mail to the right server, but I guess
you are trying to find out how to have port 25 on the real ip nat'ed to one of
the 3 dmz'ed ip based upon the destination mail address
short answer you can't as far as I know, iptables only looks at src ip / src
port & dest ip/dest port. You could write your own plugin module to look into
the tcp stream.
based upon destination email address/domain could be done by postfix and
transports for selected mail/domain to selected server. but there is
also a possibility of load balancing and failover for set of domains
with all servers working with all the domains for HA and flexibility of
computing power, then id say take a look at keepalived for both those
features. for http traffic its actually the same, and also you can
consider apache reverse proxy feature.
--
Radek aka Goblin
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