Problem with IPsec Host to Host Configuration
 

Hi all,
i am trying to configure an IPsec based Host to Host Vpn (PSK) using openswan 2.6 on my Centos machines.Me having two Static IPs and and is coming through two ADSL modems.my lan Configuartion is 192.168.20.0/24 for one modem and modem's nternal Ip is 192.168.20.254 and Second is configured as 192.168.1.0/24 and Modem's internal Ip is 192.168.1.254.So i am trying to configure IPSEC host to Host between two these networks.Configuration is made on 192.168.1.81 ans 192.168.20.50.In both modem Port 500 (UDP) is NAT towards corresponding IP.here is my Configuartion.Also enabled ip forwarding in both machines.

/etc/ipsec.conf
config setup
nat_traversal=yes
conn net-to-net
authby=secret
left=122.*.*.* (Static IP)
leftsubnet=192.168.20.0/24
leftnexthop=%defaultroute
right=69.*.*.* (Static IP)
rightsubnet=192.168.1.0/24
rightnexthop=%defaultroute
auto=start

/etc/ipsec.secrets
122.*.*.*.* 69.*.*.* : PSK "linuxisbetterthanwindows"

The same configuration is made on the right hand side.I think its problem with working behind the NAT.How can i solve the Issue.Any hep wil be appreciated.

Thanks,
Ajayan