[Openswan Users] NAT problem??

[Rafał Radecki]

Hello. I have two gateways which have Openswan installed on them. My config
file is like this:

# basic configuration
config setup
        # plutodebug / klipsdebug = "all", "none" or a combation from below:
        # "raw crypt parsing emitting control klips pfkey natt x509 private"
        # eg:
        # plutodebug="control parsing"
        #
        # Only enable klipsdebug=all if you are a developer
        #
        # NAT-TRAVERSAL support, see README.NAT-Traversal
        nat_traversal=yes
        virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12
        #
        # enable this if you see "failed to find any available worker"
        nhelpers=0

# Add connections here
conn gda-war
        left=192.168.2.133
        leftsubnet=172.16.1.0/24
        leftid=@vpn2
        leftrsasigkey=0sAQ...
        leftnexthop=%defaultroute
        #leftnexthop=172.16.2.1
        right=192.168.2.183
        rightsubnet=172.16.2.0/24
        rightid=@vpn1
        rightrsasigkey=0sAQ...
        rightnexthop=%defaultroute
        #rightnexthop=172.16.1.1
        keyingtries=2
        auto=start
# sample VPN connections, see /etc/ipsec.d/examples/

#Disable Opportunistic Encryption
include /etc/ipsec.d/examples/no_oe.conf

Gateway 1 (vpn1): eth0: 192.168.2.183   eth1: 172.16.1.1
laptop-connected-to-eth0: 172.16.1.2
Gateway 2 (vpn2): eth0: 192.168.2.133   eth1: 172.16.2.1
laptop-connected-to-eth0: 172.16.2.2
Output of command ipsec verify:

Checking your system to see if IPsec got installed and started correctly:
Version check and ipsec on-path                                 [OK]
Linux Openswan U2.4.6/K2.6.18-4-686 (netkey)
Checking for IPsec support in kernel                            [OK]
NETKEY detected, testing for disabled ICMP send_redirects       [OK]
NETKEY detected, testing for disabled ICMP accept_redirects     [OK]
Checking for RSA private key (/etc/ipsec.secrets)               [OK]
Checking that pluto is running                                  [OK]
Two or more interfaces found, checking IP forwarding            [OK]
Checking NAT and MASQUERADEing
Checking for 'ip' command                                       [OK]
Checking for 'iptables' command                                 [OK]
Opportunistic Encryption Support                                [DISABLED]

Output of command ipsec auto --up gda-war:

vpn2:/usr/share/doc/openswan/doc# ipsec auto --up gda-war
117 "gda-war" #3: STATE_QUICK_I1: initiate
004 "gda-war" #3: STATE_QUICK_I2: sent QI2, IPsec SA established
{ESP=>0xae5372fe <0xb05cebcf xfrm=AES_0-HMAC_SHA1 NATD=none DPD=none}
vpn2:/usr/share/doc/openswan/doc#

Output of command route:

vpn2:/etc/apt# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
172.16.2.0      tygrys.olimp.dg 255.255.255.0   UG    0      0        0 eth0
192.168.2.0     *               255.255.255.0   U     0      0        0 eth0
172.16.1.0      *               255.255.255.0   U     0      0        0 eth1
default         tygrys.olimp.dg 0.0.0.0         UG    0      0        0 eth0
vpn2:/etc/apt#

The problem is that two laptops connected to eth1 interfaces on both
gateways can't ping each other. When i use tcpdump -n -i eth0 there are no
ESP packets in the output despite the fact that the ping command is active
all the time.

Laptop 1 (172.16.2.2, Win2K): ping -t 172.16.1.2
Laptop 2 (172.16.1.2, Win2K): ping -t 172.16.2.2

I tried many things but can't find the bug. Every help will be greatly
appreciated;-)
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