I dont guess I made a post about adding a static NAT entry into an pre-8.3 version on the Cisco ASA. I have had that question come up, so I thought I would post about that.
You really need two things to accomplish this on an existing firewall. First, a static NAT entry. Second, an entry in your ACL that is applied to your outside interface (if coming in from the outside). Here is a look at what would need to be done.
Lets say you want to add a web server that sits on the inside of your network. I want to be able to web browse to it from the outside. My internal web server is 192.168.30.4. My external IP will be 220.127.116.11. Here is what I would need to do on pre-8.3:
access-list outside permit tcp any host 18.104.22.168 eq www <--- For access in from the outside
static (inside,outside) 22.214.171.124 192.168.30.4 netmask 255.255.255.255 <--- To get you to the server
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