Xl2tpd-strongswan

Installation

apt-get install  xl2tpd ppp strongswan

strongswan

ipsec.conf complete

conn l2tp
    keyexchange=ikev1
    left=10.84.252.32
    auto=add
    authby=secret
    type=transport
    leftprotoport=17/1701
    rightprotoport=17/%any
    right=%any

cat /etc/ipsec.secrets 
10.84.252.32 %any : PSK "1234"

XL2TP

cat /etc/xl2tpd/xl2tpd.conf 

[global]
ipsec saref = yes
debug avp = yes
debug network = yes
debug state = yes
debug tunnel = yes

[lns default]
ip range = 10.1.2.2-10.1.2.255
local ip = 10.1.2.1
refuse chap = yes
refuse pap = yes
require authentication = yes
ppp debug = yes
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes

PPP

cat /etc/ppp/options.xl2tpd

require-mschap-v2
ms-dns 192.168.240.21
ms-dns 192.168.240.22
asyncmap 0
auth
crtscts
lock
hide-password
modem
#for ppp3 
unit 3
debug
name l2tpd
proxyarp
lcp-echo-interval 30
lcp-echo-failure 4

cat /etc/ppp/chap-secrets 

xinux        l2tpd       "geheimes-passwort"	       *
#l2tpd        xinux	  "geheimes-passwort"	       *