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NAT on Internet router

I have a 2600 with a Public IP configured on the Ethernet Interface. Is it possible to NAT another public IP to a private IP on the same Ethernet Interface or does this require two Ethernet Interfaces? In addition, what would the proper config look like to accomplish the above?

The purpose of the NAT is to enable a separate VPN Tunnel for the VPN 4.x clients to connect and then be able to route through an existing site-to-site VPN tunnel on the "Outside" Interface of the same Pix.

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Re: NAT on Internet router

We can configure it on the same ethernet interface.

"ip nat inside source static 10.1.1.1 172.16.1.2" assuming that 172.16.1.1 public IP is already configured on your ethernet interface.

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