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I hope what I want is possible...
Consider this: I have two networks, Site1 (192.168.1.0/24) and Site2 (10.0.0.0/24). They are connected with a site-to-site IPSEC tunnel.
There is an IP in Site1, 192.168.1.1 that I want to "become" 10.0.0.1 in Site2.
I thought to realize this with Full NAT, but that does squat in this case.
I have a VoIP phone in Site1 which I want to connect to the Phone-Server in Site2. While this does work when I let the IP remain 192.168.1.1 (Phone-Server registers the IP as that one). However, for other reasons, I need the Phone-Server to register the Phone as if the phone were locally in Site2, having 10.0.0.1 address. So I want to change the IP of the packet as it travels towards the phone-server.
How about a simple diagram with IPs?
Cheers - Bob
In reply to BAlfson:
Actually I think I made some progress. I created an additional address at Site2, the IP that the phone should have, and then I SNATed Site1 IP to the Additional Address. Now the phone-server sees the correct IP.