No, you don't need to move from the generic MICRO to the WRT54GS version of MICRO. They're identical except for the header.
As for your P2P issue, it has been covered at great length on the Forum. Use the "search" function, check the Wiki, etc. for an answer to your question before posting for the answer. A bit of research on your part will tell you what you need to know. Good luck!! _________________ Clear 4G Wimax.
Linksys WRT54G-TM w/14929 std-nokaid, fan-cooled, 2 GB SD mod, Primary Router.
Linksys WRT54G v.3 w/15230 std-nokaid, Client Bridge.
Linksys E2000 w/15200 "Big"
Linksys WRT54G v.4
La Fonera 2100, fan-cooled
Linksys WRT54G v.3.1
Linksys WRT54G v.1.1
Linksys WRT54GS v.1
2x Linksys WRT54G v.2.2