crypto isakmp policy 1
  encr 3des
  authentication pre-share
  group 2
  lifetime 3600
crypto isakmp key YOURKEY address 10.20.30.42 no-xauth
!
!
crypto ipsec transform-set hostb-transform esp-3des esp-sha-hmac
  mode transport
!
crypto map hostb-cryptomap 1 ipsec-isakmp
  set peer 10.20.30.42
  set transform-set hostb-transform
  set pfs group2
  match address hostb-list
!
interface FastEthernet0/1
  ip address 10.20.30.40 255.255.255.0
  duplex auto
  speed auto
  crypto map hostb-cryptomap
!
ip access-list extended hostb-list
  permit ip host 10.20.30.40 host 10.20.30.42
!

# enable IKE debugging
debug crypto isakmp

# enable IPSec debugging
debug crypto ipsec

# disable all debugging
no debug all

apt-get install racoon ipsec-tools

/etc/ipsec-tools.conf

#!/usr/sbin/setkey -f

flush;
spdflush;

spdadd 10.20.30.42 10.20.30.40 any -P out ipsec
  esp/transport//require;

spdadd 10.20.30.40 10.20.30.42 any -P in ipsec
  esp/transport//require;

/etc/racoon/racoon.conf

path pre_shared_key "/etc/racoon/psk.txt";
path certificate "/etc/racoon/certs";

remote 10.20.30.40 {
    exchange_mode main;
    lifetime time 1 hour;
    proposal {
        encryption_algorithm 3des;
        hash_algorithm sha1;
        authentication_method pre_shared_key;
        dh_group 2;
    }
}

sainfo anonymous
{
    pfs_group 2;
    lifetime time 1 hour;
    encryption_algorithm 3des;
    authentication_algorithm hmac_sha1;
    compression_algorithm deflate;
}

/etc/racoon/psk.txt

10.20.30.40 YOURKEY

/etc/init.d/setkey restart
/etc/init.d/racoon restart

# kontrola, jestli data jdou tunelem - mely by byt videt jako ESP pakety
tcpdump -i eth0

# pro troubleshooting tunelu
tail -f /var/log/daemon.log

# spuštění racoonu v popředí v debug módu (před tím je dobré zastavit službu)
racoon -d -v -F -f /etc/racoon/racoon.conf

crypto isakmp policy 1
 encr 3des
 authentication pre-share
 group 2
 lifetime 3600
crypto isakmp key KEY-TEST address 192.168.100.2 no-xauth
!
!
crypto ipsec transform-set TS-TEST esp-3des esp-sha-hmac
!
crypto map CRYPTOMAP-TEST 1 ipsec-isakmp
 set peer 192.168.100.2
 set transform-set TS-TEST
 set pfs group2
 match address ACL-TEST
!
interface FastEthernet0/0
 ip address 192.168.100.100 255.255.255.0
 duplex auto
 speed auto
 crypto map CRYPTOMAP-TEST
!
interface Vlan1
 ip address 10.0.0.1 255.255.255.0
!
!
ip access-list extended ACL-TEST
 permit ip host 10.0.0.2 host 192.168.100.2

# enable IKE debugging
debug crypto isakmp

# enable IPSec debugging
debug crypto ipsec

# disable all debugging
no debug all

apt-get install racoon ipsec-tools

/etc/ipsec-tools.conf

flush;
spdflush;


spdadd 192.168.100.2/32 10.0.0.2/32  any -P out ipsec
   esp/tunnel/192.168.100.2-192.168.100.100/require;

spdadd 10.0.0.2/32 192.168.100.2/32 any -P in ipsec
   esp/tunnel/192.168.100.100-192.168.100.2/require;

/etc/racoon/racoon.conf

path pre_shared_key "/etc/racoon/psk.txt";
path certificate "/etc/racoon/certs";

remote 192.168.100.100 {
        exchange_mode main;
        lifetime time 1 hour;
        proposal {
                encryption_algorithm 3des;
                hash_algorithm sha1;
                authentication_method pre_shared_key;
                dh_group 2;
        }
}
 
sainfo address 192.168.100.2/32 any address 10.0.0.2/32 any {
        pfs_group 2;
        lifetime time 1 hour;
        encryption_algorithm 3des;
        authentication_algorithm hmac_sha1;
        compression_algorithm deflate;
}

/etc/racoon/psk.txt

192.168.100.100 KEY-TEST

/etc/init.d/setkey restart
/etc/init.d/racoon restart

# kontrola, jestli data jdou tunelem - mely by byt videt jako ESP pakety
tcpdump -i eth0

# pro troubleshooting tunelu
tail -f /var/log/daemon.log

# spuštění racoonu v popředí v debug módu (před tím je dobré zastavit službu)
racoon -d -v -F -f /etc/racoon/racoon.conf