Online you mean to play alone?or to play with other ppl too?
Anyway if you want to play alone open first the loginserver.properties at C:/server/login/config and you have to search for those lines:ExternalHostname=127.0.0.1<---Add this number
InternalHostname=127.0.0.1<---Add this number
When you do this you have to go at C:/server/gameserver/config and open the File :Server.properties
Now Search for those lines again: ExternalHostname=127.0.0.1<---Add this number
InternalHostname=127.0.0.1<---Add this number
Ok now you have to go at C:/server ,press the Start.bat after that go to C:/server/loginserver and press the startLoginserver.bat then go
C:/server/gameserver and press the startGameServer.bat
You're ready now you just have to go at your lineage 2 system and press the l2.exe and put your acc[if you dont have create account go to C:/server/login and press the startSQLAccountManager to create one of ur choice]
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Now if you want others to login in your server to you have to open first your firewall ports(80tcp/udp,2106tcp/udp,7777tcp/udp)[For more informations about ports go there www.portforwarding.com
2)go again in this line(both at C:/server/login/config and C:/server/gameserver/config)and when you find the following line add your WAN IP
ExternalHostname=[<---Add here your WAN ip,you can find your wan ip there www.whatismyip.com
3)now if you want others to connect you have to choose one of the 2 Ways of login :First choice:Press Start--->Run and add in the run field this one C:/windows/system32/drivers/etc open the hosts folder ,and add under the 127.0.0.1 localhost line the following lines:
xxx.xxx.xxx l2authd.lineage2.com
xxx.xxx.xxx L2testauthd.lineage2.com
[xxx.xxx.xxx=ur Wan ip]P.S:your friends have to do that too to connect
Second choice:Download L2Fileedit and a patched system,Run your Fileedit and Press the button Open and Decrypt and search for your l2 patched system
Well now when you find the line ServerAdrr:[Add your WAN ip here] and press Save and Encrypt,you are ready now the only thing you have to do is the Share of this system to others in order to connect
P.S:Sorry for bad english :D