ok,
1.Best version for C1 OFF is L2walker 10.2.3 and all Ingame walkers, protocoll version for C1 OFF is 419/786 and the ip is in the l2.ini, u can easy decrypt it, look at some sticky threads here
2.For L2j C2 and C2 Official (only Ncsoft pay server) can u use newer walkers like 10.3.0, 10.3.1 etc. Protocol is 486 and the ip is in the l2.ini (u need a newer decrypter, ull find it in some sticky threads) , for C2 Official is the ip=L2authd.lineage2.com .
3.For modded servers like L2extreme is the protocol the same as C1 OFF cuz its only a C1 OFF modded to C2, but walker have some problems with it, cuz differenet login/game server
4.For C3 PST Ncsoft server ist the ip=L2testauthd.lineage2.com and protocol 528, u should use newer bots like 10.3.5 - 10.3.9
Note: Ingame Walkers have some problems with C2 Client but there is a fix, sry iam still searching for it ^^