RE: PortForwarding on Cisco

["Mark Tinka" <mtinka at africaonline.co.ug>]

You use NAT.

Say you have a mail server seated on your private 192.168.0.0 network; and
this is your subnetted network:

192.168.0.1 - internal ethernet interface on router configured for "ip nat
inside".

192.168.0.2 - mail server

192.168.0.3 - .254 - rest of your network

x.x.x.x - public IP address on your serial or ISDN connection

First, setup your NAT:

conf t
 int e0
  ip address 192.168.0.1 255.255.255.0
  ip nat inside
 
 int s0
  ip address x.x.x.x x.x.x.x
  ip nat outside

 access-list 1 permit 192.168.0.0 0.0.0.255

 ip nat inside source list 1 interface s0 overload

Then port forware all SMTP-destined traffic sent to your x.x.x.x public IP
address to your internal mail server:

conf t
 ip nat inside source static tcp 192.168.0.2 25 x.x.x.x 25 extendable

That's all there is to it.

Regards,

Mark Tinka - CCNA
Network Engineer
Africa Online Uganda
5th Floor, Commercial Plaza
7 Kampala Rd,
Tel:   +256-41-258143
Fax:   +256-41-258144
E-mail: mtinka at africaonline.co.ug
Web:     www.africaonline.co.ug
 

-----Original Message-----
From: owner-afnog at afnog.org [mailto:owner-afnog at afnog.org] On Behalf Of
Richard Mikisa
Sent: Monday, May 05, 2003 11:54 AM
To: afnog at afnog.org
Subject: 


how do you port forward on a cisco router (2611) e.g if  i want all traffic
to 
my mail server to be forwarded to the server sitting on my internal lan, 
connection type in this case is ISDN.
-- 
cheers
Richard

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