Static NAT Public to Private IP and vice versa

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Nov 10th, 2009
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Hi ,

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

Public IP sholud be translated to 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 but when it will hit the NAT router it should get translated to Private IP which is a Sonicwall LAN IP.

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


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 ?

Many thanks for your time and support.

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Laurent Aubert Tue, 11/10/2009 - 20:44
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You can try the following config on the 1841:

ip nat inside source static esp interface dialer 1

ip nat inside source static udp 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.




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