IOS and destination NAT

Sep 15, 2006 2 Replies
IOS and destination NAT open original image

Hello.



Here is a brief description of my problem:



I am trying to do destination-NAT using a cisco-router running IOS



12.2(15)T2

Interfaces: Interface FastEthernet0/1: public IP / ip nat outside



Interface FastEthernet0/0.1-0.X: public IPs / no nat



Interface Tunnel0: private IP - connection to private ip-networks / ip nat inside



At the moment the device is using NAT (SNAT) for the private IP-networks: ip nat inside source list NATList interface FastEthernet0/1 overload ip access-list extended NATList permit ip 10.0.0.0 0.0.0.255 any



permit ip 10.0.1.0 0.0.0.255 any



permit ip 192.168.2.0 0.0.0.255 any



permit ip 192.168.5.0 0.0.0.255 any



permit ip 172.8.0.0 0.0.0.255 any



... !



In addition I like to configuer now a Destination-NAT for some IPs connected at the moment via Fa0/0.Y to be forwarded somewhere into the private IP-Space, lets say: all traffic targeting public.ip.dnat.1 has to be forwarded to



192.168.2.11 and all traffic originating from 192.168.2.11 has to be NATed to public.ip.dnat.1.


I tried a lot - but gave me no usable results (for my understanding I need something like 'ip nat outside destination static ....' but ... you know thats not there ;-) I can do something like portforwarding - but no complete redirection



Maybe someone of you can help me untie the gordian knot in the head of a poor autodidact.



Thank you Best regards Klaus


Let me guess... DNS resolves to the external IP for something like a web or email server, but you need the NATed IP to be accessible to internal clients?

If so, I've already asked the question at

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Perhaps someone can help us out of this bind (no pun intended, if you've read that other thread).

Nope ;-) I did not wrote about DNS. I simply have problems setting up a DNAT.

I tried something like: ip nat inside source static 192.168.2.11 public.ip.dnat.1 ip nat outside source static public.ip.dnat.1 192.168.2.11 and other curios stuff

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