/etc/ipsec.d/examples/mast-l2tp-psk.conf is in openswan 1:2.6.37-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# assumes 192.168.1.0/24 is our L2TP range
interfaces="%defaultroute"
protostack=mast
nat_traversal=yes
# T-Mobile and Rogers/FIDO now use 25/8 as "private space" too :(
virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:!192.168.1.0/24
conn L2TP-PSK-NAT
rightsubnet=vhost:%priv
also=L2TP-PSK-noNAT
conn L2TP-PSK-noNAT
#
# Configuration for one user with any type of IPsec/L2TP client
# including the updated Windows 2000/XP (MS KB Q818043), but
# excluding the non-updated Windows 2000/XP.
#
#
# Use a Preshared Key. Disable Perfect Forward Secrecy.
#
# PreSharedSecret needs to be specified in /etc/ipsec.secrets as
# YourIPAddress %any: "sharedsecret"
authby=secret
pfs=no
auto=add
keyingtries=3
# we cannot rekey for %any, let client rekey
rekey=no
# Apple iOS doesn't send delete notify so we need dead peer detection
# to detect vanishing clients
dpddelay=10
dpdtimeout=90
dpdaction=clear
# Set ikelifetime and keylife to same defaults windows has
ikelifetime=8h
keylife=1h
# l2tp-over-ipsec is transport mode
type=transport
#
# MAST parameters - requires
# ipsec saref = yes in /etc/xl2tpd/xl2tpd.conf
sareftrack=yes
overlapip=yes
#
left=YourGatewayIP
#
# For updated Windows 2000/XP clients,
# to support old clients as well, use leftprotoport=17/%any
leftprotoport=17/1701
#
# The remote user.
#
right=%any
# Using the magic port of "%any" means "any one single port". This is
# a work around required for Apple OSX clients that use a randomly
# high port.
rightprotoport=17/%any
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