2006-05-14 vpn 2 sfc http://itc.sfc.keio.ac.jp/pukiwiki/index.php?IPSec-VPN%A5%B5%A1%BC%A5%D3%A5%B9%CD%F8%CD%D1%CA%FD%CB%A1%28Windows%20XP%A4%CE%CE%E3%29 to achieve my objective, i should use IPSec-VPN(established by cisco vpn client), not L2TP-VPN.