apt-get install xl2tpd ppp lsof

service xl2tpd restart

#debug

tail -f /var/log/syslog

.

vim /etc/xl2tpd/xl2tpd.conf

[lns default]

ip range = 192.168.88.100-200

local ip = 192.168.88.1

require chap = yes

refuse pap = yes

require authentication = yes

name = LinuxVPNserver

ppp debug = yes

pppoptfile = /etc/ppp/options.xl2tpd

length bit = yes

.

.

vim /etc/ppp/options.xl2tpd

ipcp-accept-local

ipcp-accept-remote

ms-dns 8.8.8.8

noccp

auth

idle 1800

mtu 1410

mtu 1410

nodefaultroute

debug

proxyarp

connect-delay 5000