Configuring an inside nat group on inside interface

Here is an interesting problem.. I am missing something very simple.

I have a pix that I want to setup as a vpn server. I am using the easy client software. I have a pool of ip addresses. This is a pool that I picked out of the blue not in use, I have no problem getting the remote client to authenticate and get an ip address from the pix in this range.

I do not have any control of the internal router, The inside interface has an ip address on the inside network, and I have confirmed connectivity. If I put in the correct routes, I can ping from the pix to anywhere without any problems.

Here is what I need to do though. I need to have the network natted on the inside. That way, when I get an ip address from this pool and try to ping from a client computer with a 192.168.254 address, as far as the inside is concerned, I am coming from a address and not a address.

Can it be done?

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Turn the PIX backwards, attach the VPN to the "inside" interface, connect that to the internet, put on its outside interface, connect that to the LAN, turn off nat 0 access-list for the VPN. Packets accepted on the inside interface VPN will have their source address PAT'd as they go out the outside interface into the LAN .

You could possibly accomplish the same thing using reverse NAT, with a "nat (outside)" and "global (inside)" pair, but I'm not positive it can be done that way -- it depends on whether the PIX will proxy arp on the inside interface on behalf of reverse-NAT'd IPs. Usually routing is checked before NAT, and you have a problem because the PIX will notice that the destination is in the same network as the inside interface and so will drop the packets. You -might- be able to get around that by putting in static routes for the individual 172.16/16 IPs that you want to front the VPN users under.

Reply to
Walter Roberson

hmmm.. i am not sure how I would begin to do that.

Internal Lan - --- Inside Pix Outside Pix --- | |

--- (Pool of IP addresses)

I need to basically nat to look like it is coming out of


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