1. download
2. 展開(vpnclient)
3. /usr/local/ 配下に移動
4. sudo make

sudo /usr/local/vpnclient/vpnclient start
sudo /usr/local/vpnclient/vpncmd 

niccreate
accountcreate
accountpasswordset
accountstartupset
accountconnect
accountstatusget

sudo vi /etc/network/interfases

iface vpn_nic inet dhcp

ネットワークリスタート

/etc/init.d/networking restart 
もしくは
sudo ifdown vpn_nic
sudo ifup vpn_nic

#!/bin/bash
cd /usr/local/vpnclient/
sudo ./vpnclient start
sudo ifdown vpn_nic1
sudo ifup vpn_nic1