Hi, I wrote a opensource MMO-network lib myself. Maybe it will help you to pick some stuff out or just merge it with panda3d: syncsys.sf.net . I will add “non-reliable-protocol support” soon, so using syncsys with a UDP based lib will benefit from the non-reliable stuff.
But maybe this system is not suitable for a panda application because its maingoal is to provide a library which scales well with the number of cores/threads. For some test of the system take a look at networklibsbenc.sf.net (have to update this side…).