cisco 877 router with one Static IP for NAT and PAT

[cheeang69]

Hi

Does cisco 877 support single Static Valid IP for NAT and PAT or Do I need an addition Valid IP for PAT ?

I configure the NAT (Dynamic) for my Internal LAN to access the internet, it works fine but I can't get the PAT for port 25 to reach my internal Mail server. I only have one Valid IP address.

Please advice here

Thanks

[dan.cicioiu]

Hi

i think that it should work. Try this :

R1Rack1#sh run | i nat ins

ip nat inside source static tcp 192.168.1.1 25 194.194.194.194 25 extendable

R1Rack1#

R1Rack1#

R1Rack1#sh ip nat trans

Pro Inside global Inside local Outside local Outside global

tcp 194.194.194.194:25 192.168.1.1:25 --- ---

R1Rack1#

Where 192.168.1.1 is your internal smtp server

and 194.194.194.194 is you public ip.

[cheeang69]

Hi I have tried that already, But I still can't telnet to the public ip address of port 25.

Do you need me to post my config here ?

[peteresh87]

Hi,

Just wondering if you have solved the problem,

AS I have pretty much the same issue

Cheers,

peter