# vi /etc/ipsec.conf
config setup
interfaces="ipsec0=eth1"
klipsdebug=all
plutodebug=all
plutoload=%search
plutostart=%search
uniqueids=yes
conn cisco831
af=inet
spi=0x200
type=tunnel
auth=esp
authby=secret
esp=3des-md5-96
auto=start
left=128.12.2.10
leftsubnet=128.12.3.0/24
leftnexthop=128.12.2.1
right=128.12.1.155
rightsubnet=192.168.1.0/24
rightnexthop=128.12.1.10
# end /etc/ipsec.conf Linux FreeSwan IPSEC configuration file