FireBrick to Openswan Strongswan IPsec (Howto)

Linux (CentOS Openswan) Example Using IKE2 and Preshared keys

yum install openswan

(strongswan is much nicer, but not in yum on centos5. On centos6, use strongswan)

In /etc/ipsec.conf uncomment

include /etc/ipsec.d/*.conf

Put following two files in /etc/ipsec.d/ :

myFireBrick.conf:
conn myFireBrick
       authby=secret
       auto=start
       ikev2=insist
       left=CentOS.IP.Address
       leftid=CentOS.IP.Address
       leftsubnet=CentOS.IP.Address/32
       right=FireBrick.IP.Address
       rightid=FireBrick.IP.Address
       rightsubnet=FireBrick.LAN.SUBNET/24

in: myFireBrick.secrets:

CentOS.IP.Address FireBrick.IP.Address : PSK "YourSecretHere"

chkconfig ipsec on
service ipsec start

Put the following in the FB at the other end:

<connection name="IPSec" peer-ips=CentOS.IP.Address" auth-method="Secret" secret="YourSecretHere" internal-ipv4="FireBrick.LAN.IP.Address" routes="CentOS.IP.Address" log="default"/>

strongSwan

file: /etc/ipsec.conf

conn myFireBrick
      authby=secret
      auto=start
      left=strongSwan.IP
      leftid=strongSwan.IP
      leftsubnet=strongSwan.IP
      right=FireBrick.IP
      rightid=FireBrick.IP
      rightsubnet=SUBNET.ON.FireBrick.LAN
      lifetime=2m

file: /etc/ipsec.secrets

strongSwan.IP FireBrick.IP : PSK "YourSecretHere"