NAT Configuration require

[Dhiraj Jagdale]

We have 4 no. of internal servers need to access from outsite(internet) by using single public ip address. need NAT configuration for cisco router.

[Mark Malone]

example

ip nat inside source list 111 interface fa4 overload

access-list 111 permit ip 192.168.0.0 0.0.0.255 any

ip nat inside -----on lan interface or vlan

ip nat outside----- on wan interface or dialer

[Richard Burts · Accepted solution]

As I read the original post the requirement is that 4 servers in the private network need to be accessible from the Internet. If that is not correct than I hope that the original poster will provide correction. What they need to be accessible from the Internet is a static translation and not the dynamic/PAT that is suggested by Mark. And if there is only a single public IP address then it needs to be done with port forwarding where the port is identified and not by a simple static NAT. It might look something like this

ip nat inside source static tcp 10.1.2.250  25  1.2.3.4  25  extendable

ip nat inside source static tcp 10.1.2.251  80  1.2.3.4 80  extendable

ip nat inside source static tcp 10.1.2.252  110  1.2.3.4 110  extendable

ip nat inside source static tcp 10.1.2.253  443  1.2.3.4 443  extendable

Note that this works if each of the 4 servers provides a unique service but would not work if 2 of the servers are offering the same service (like 2 servers providing HTTP).

HTH

Rick 

[Dhiraj Jagdale]

Thanks Richards.....