Cisco ISA 550 NAT problem

[Charith Gamhewa]

Hi all,

I have bought a Cisco ISA 550 small business firewall and I had to face to a problem when I configure the NAT.

My scenario is,

I have a mail server in my LAN which is need to be access from both inside and outside

My lan network is 192.168.0.0/24

I have a PPPoE WAN connection with a static IP

Mail server IP 192.168.0.15/ 24

There is not a DMZ zone. I need to NAT this server to my WAN IP and that WAN IP is also used

to provide internet connection to other LAN users. I could do this with my previous ADSL

router and i tried to do this with firewall but couldn't acheive the task.

Hope a help from some expert.

Thanks,

Charith

[Michael Muenz · Accepted solution]

Do you want that your internal clients connect to the WAN IP and get natted to the local LAN IP?

Then open the Maintain and Operate Guide at cisco.com and search for "hairpinning".

Michael

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