l2tp vpn by storngwan and xl2tpd

ipsec.conf

config setup
        nat_traversal=yes
        virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12
        charonstart=yes
        plutostart=yes
conn L2TP
        authby=psk
        pfs=no
        rekey=no
        type=tunnel
        esp=aes128-sha1
        ike=aes128-sha-modp1024
        left=x.x.x.x
        leftnexthop=%defaultroute
        leftprotoport=17/1701
        right=%any
        rightprotoport=17/%any
        rightsubnetwithin=0.0.0.0/0
        auto=add

options.xl2tpd

ms-dns 8.8.8.8
asyncmap 0
auth
crtscts
lock
hide-password
modem
mru 1410
debug
mtu 1410
name l2tpd
proxyarp
lcp-echo-interval 30
lcp-echo-failure 4
ipcp-accept-local
ipcp-accept-remote
noipx
idle 1800
connect-delay 5000
noccp
nodefaultroute

xl2tpd.conf

[global]
listen-addr=x.x.x.x
debug network = yes
debug tunnel = yes

[lns default]
ip range = 10.0.0.200-10.0.0.254
local ip = 10.0.0.1
require chap = yes
;refuse chap = yes
refuse pap = yes
require authentication = yes
ppp debug = yes
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes