debian / ubuntu vpn / pptp client

# apt-get install pptp-linux


# vi /etc/ppp/chap-secrets

username PPTP password *

# vi /etc/ppp/peers/myvpn

pty "pptp vpn.domain.com --nolaunchpppd"
name username  # 對應到 /etc/ppp/chap-secrets
remotename PPTP
require-mppe-128
file /etc/ppp/options.pptp
ipparam myvpn

連接：
# pon myvpn

或

# pon myvpn debug dump logfd 2 nodetach  # with debug


添加路由表：
# route add -net 192.168.8.0/24 dev ppp0
# route add default gw 192.168.8.254 device ppp0



Reference :
PPTP Client
Linux configure point to point tunneling PPTP VPN client for Microsoft PPTP vpn server