We have been asked to create a VPN tunnel between a vendor and a site of ours. The vendor is claiming our internal address is already taken by another client. For arguments sake, we will say it is 192.168.2.0\24. They are requesting we present 10.10.10.0\24 to the tunnel as our address and let our firewall translate it to the correct local IP address.
I have never done this before and I am not sure where to begin or even the proper terminology to google a solution.
I am only familiar with the ScreenOS and not console into the device. Any assistance in direction would be appreciated.