Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

IOS Firewall how to open port to server inside

I have a CISCO 1711 Security Router (Firewall feature set) that is our connection to the Internet. I am using NAT overload (PAT) and want to open a port to a mail server on the inside. Can I do this by just adding an entry in the acl for the outside interface and then using an ip port-map smtp port 25 list xx command.

Thanks

Gary

2 REPLIES

Re: IOS Firewall how to open port to server inside

hello gary..

you have to do a static NAT to the server before proceeding to open the ports.. on the router use the command:

ip nat inside source static ......

give the inside and the outside ip addresses... then proceed with the access-list command which will allow only port 25 access from outside...

All the best !!

New Member

Re: IOS Firewall how to open port to server inside

hello Gary ,

All the Ports in Cisco IOS are open by default , until & unless you have made a access-list to block certain applications.

Thanks

Vijay Tyagi

266
Views
0
Helpful
2
Replies