Packet routing

[faisal]

I've many questions relating to packet routing
1. My Gnutella servent received PING from neighbor and passed it to another node. What should I keeped from PING packet, just a GUID? How long I hold these GUIDs?
2. When PING came with GUID who was same with GUID that I've saved, It must be dropped, is it right?
3. Does PONG packet that the servent received should be saved (to avoid resending PONG when PONG with identical GUID come)?
4. For routing packet I've a plan to keep in hash table but till now I don't know how to implement it. Could you hel me..... (I try to learn Java and network application trough Gnutella project)
5. What kind of mechanism that Phex used for packet routing, or maybe there're any suggestion for packet routing?

Thank you
Faisal I. M.