You can try to use the Auto Tunnel GG software its easy to use software that does all that automatically.

I believe they have a free trail for 5 days. Check it out to see if it works for you

AutoTunnel GG service - Download to play MapleStory, Cabal Online, GunBound, Silkroad Online, Lineage, Ragnarok from behind firewalls and proxy servers at school or university - free trial available.

Let me know if it works for you