We have an ASA5505 firewall, and 1 server on our internal network - this server runs DNS, mail, DHCP etc...
We want mail and webmail from external IPs to forwarded to our internal server.
We understand it is possible (but not easy) to do the port forwarding with NAT, access_rules etc... - I have spent way too much time trying to figure this out for ASA version 8.3(1) - big PITA!
The public server feature seems to be what we want, but it only works with DMZ (we currently do not use a DMZ as we have only 1 server).
Our internal server has 2 NIC cards (currently setup in parallel to increase bandwidth). Would it be possible/advisable to have 2 LAN connections from the ASA - a DMZ going directly to the server NIC1, and a normal connection to the rest of the LAN (and accessed by NIC2 on the server)?
All help appreciated!