Static NAT Public to Private IP and vice versa

Unanswered Question
Nov 10th, 2009

Hi ,

I need to configure Cisco 1841 to translte public IP ( 95.141.153.100) to the private IP (10.0.0.253)and vice versa.I am using ADSL2, PPPoA and Dialer interface configured for NAT overload/PAT.

Public IP 95.141.153.100 sholud be translated to 10.0.0.253 which will use to build the VPN tunnel to the remote ofice.

To build the VPN from the remote office, remote office(sonicwall) will use public IP 95.141.153.100 but when it will hit the NAT router it should get translated to Private IP 10.0.0.253/24 which is a Sonicwall LAN IP.

Can you please advise if that is possible and what configuration is needed.

Diagram:

Remote Office----->Inernet----->C1841----->Sonicwall------>LAN Switches------PC/Servers

Do I ned to create two NAT statments, one for inbound and one for out bounds traffic? ANy sample config will help.

Will SonicWall be pingable from the internet using IP 95.141.153.100 ?

Many thanks for your time and support.

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Laurent Aubert Tue, 11/10/2009 - 20:44

Hi,

You can try the following config on the 1841:

ip nat inside source static esp 10.0.0.253 interface dialer 1

ip nat inside source static udp 10.0.0.253 500 dialer 1 500

If your VPN client and VPN router supports NAT-T, it would be the solution as you don't need any specific NAT configuration on the 1841 anymore.

HTH

Laurent.

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