Accomplishing this would be quite simple really.
Have a computer sitting between the PS2 and the internet connection (or have the ps2 and a computer on the same hub (not switch!)) and then sniff the packets coming from the PS2.
The actual connection interception is a bit more difficult...
If it resolves the servers by DNS then it's simple, make your router (whether that's a pc or a hardware router) resolve the server's DNS to the box you're running the emulator on.
Aside from that, development would be just like any other server emulator... probably a degree easier since Sony can't change the protocol on you.
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