I've been asked to setup a VPN server in a lab which has a number of (mostly OS X) clients with IP addresses of the form A.B.C.x (where x is the only part which will differ from one machine to the next). The reason for this is that we want people to be able to be able to see things such as a networked file store (which advertises its presence via Bonjour) as if they were on the same network. The machines are using public IP addresses, so there is no NAT involved. I just want people to be able to connect from wherever they are to the VPN server, so that all their traffic appears to come from that machine, and everything on the server's network appears to be on the client's network.

I don't know a great deal about VPNs in particular, but it looks as if my choices are broadly limited to OpenVPN and OpenSwan. However, I'm not sure which one to use, or whether either of them will actually achieve what I want. The most important thing is that OS X clients can connect via the VPN and talk to one another (and things like the networked file store) as if they were on the same network, even though they might be in different locations. Multiple clients must be able to connect to the server at the same time as well. Does anyone know if this is possible using OpenVPN or OpenSwan?

Thanks in advance.

Edit: Should have pointed out that the server is an x86 box running Debian.

Yes, openvpn will do everything you want.