But dualbox will be posible here or not ? how many box etc ?
About protection all people know how to open l2 2 times. but not all know about debug / hacking or doing virtual machines. so you could have 1 or 2 buthurts doing dualbox instead of 10 average players. so you will have much less people to control maybe even nobody
About Lan party those modules use Mac or other metods so IP is not needed
I dont recommend this one is just a example
http://www.kasha-malaga.es/screenshots.html
Regards
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BTW L2.bat is maded by you ? not bad