NAT/PAT Setup with internal web server.

Question

Environment:
Web Server inside and 10 internal workstations.
One external public IP address.
Cisco Router 806 with HTTP server enable.
Conditions:
External users have to be able to access the web server.
The internal users have to be able to access the web server via the "EXTERNAL" IP address. Since they are using an external DNS.
Scenario:
The internal workstation request from external DNS address for the web server.
DNS replies with external IP address.
Workstation attempts to connect to web server via external IP address.
Connection fails at the router showing the router's HTTP logon page.
We are trying to implement NAT/PAT inside, with static assignment to port 80 to the internal web server.
Thanks, Pat Askins.

Answer 1

You need to use cisco NAT virtual interface,
Example:
your internal network web server ip 192.168.1.10/24 Fa0 router Fa1 Public Ip address 1.1.1.1
here is what you need to configure in NAT router to resolve your issue:
int fa0
ip nat enable
no ip redirects
int fa 1
ip nat enable
no ip redirects
ip nat source static tcp 192.168.1.10 80 1.1.1.1 80 overload
ip nat source list 1 interface fa0 overload
access-list 1 permit 192.168.1.0 0.0.0.255
now you can try access to your 1.1.1.1:80 from inside network.