Which VPN Protocol should I use?

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I have another assignment on how to create a VPN solution for an corporate company. This company will need VPN for their mobile user, to connecting two of their building, and for their extranet partner solution.

Thinking about IPsec as the solution for mobile user solution, because:
  1. ISA server and Cisco hardware already support this. Now it's depend on which base I will need, hardware of software? Personally I like software much, because if there is a need to upgrade it, I can do it easily. With hardware, sometimes there is a limitation on upgrading the OS.
  2. With IPsec, I will use IKE for the key exchange solution, and AH, ESP for authentication. Not too hard, just need a big understanding on how it will work. Beside these protocols already the best if I'm not wrong
  3. It is easy to have mobile user, with Cisco hardware. They already create the cisco vpn client program so I don't have to deal with the client. Nice ^^ Although I know you can connect using Windows, but hey, less effort means the higher posibility of finishing the assignment early
  4. Easy to setup :D Already built in on Fedora I guess. Using FreeS/wan project.
Now, the problem is how to connect from site to site. I think using IPsec will give too much payload and make the connection slower. For the site to site, speed is the priority. Security is number two, since I plan to get a leased line. The choices will be
  • Point to Point Tunneling Protocol (PPTP)
  • Layer 2 Tunneling Protocol (L2TP)
  • Internet Protocol Security (IPSec) tunnel mode
  • Secure Sockets Layer (SSL)
Ah o.0' Still need to do another research.. LOL...

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