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"	       *