Hi friend, I have just recently researched the same thing and have been quite successful!
I used the following two threads to setup my walker:
After setting up L2 walker for retail servers I then edited the set.ini file and added [11]Luna to the USA list so it should look like this:
[USA]
LoginServerIP=L2authd.Lineage2.com
LoginServerPort=2106
ProtocolVersion=828
ServerList=[1]Bartz;[2]Sieghardt;[3]Kain;[4]Lionna;[5]Erica;[6]Gustin;[7]Devianne;[8]Hindemith;[9]Teon;[10]Franz;[11]Luna
I have setup on two different computers (xp and vista) for botting with this setup on Luna. Good luck!
Special Thanks to xenosaga21 and Tault_sillicon for providing links/cracks and guides
Happy botting