TCP/IP ports

[vassalli]

In my structure there is an old site connected to the Web through an ISDN access.

The router is a 761. Inside this site there is a microsoft exchange server with a small business OS installed.

The problem is that I can't open or close tcp/ip port and I can't find documentation about it anywhere.

The mail server has to be reached from the external, since it is not only for internal mail, but it receives mail and sends through smtp.

So how to open/close TCP/IP ports?

THXS,

Pietro

[tepatel]

I assume that you are running NAT/PAT on public ip address. and you have mail server on the internal LAN

You need to turn on PAT using "set ip pat on" and use "set ip pat porthandler" command with the ip address of the email server like below if you have ip of email server is 1.1.1.1 then you need.

set ip pat porthandler smtp 1.1.1.1

Pl. visit here for more information

http://www.cisco.com/univercd/cc/td/doc/product/access/acs_fix/750/700cr44/700crip.htm#xtocid554923

Here is the url which has docs on 700 series routers..

http://www.cisco.com/univercd/cc/td/doc/product/access/acs_fix/750/700cr44/index.htm