[Openswan Users] OpenSwan Tunnel Established - Communication only passing in one direction

[Trev Lerks]

Good Afternoon and I immediately apologize if this has been sent to the wrong distribution list -
Currently I have a tunnel up from OpenSwan to an ASA using Nat-T.
Host A (172.20.1.15) --> OpenSwan --> Internet <-- ASA  <-- Host B (192.168.1.2)
What is working:Ping/RDP from Host B to Host APing from OpenSwan to Host B
What isn't working:Ping/RDP from Host A to Host B
I seem to be struggling with the iptables setup on the OpenSwan Server, however this is my current setup:
Table: mangleChain PREROUTING (policy ACCEPT)num  target     prot opt source               destination
Chain INPUT (policy ACCEPT)num  target     prot opt source               destination
Chain FORWARD (policy ACCEPT)num  target     prot opt source               destination1    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED2    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0
Chain OUTPUT (policy ACCEPT)num  target     prot opt source               destination
Chain POSTROUTING (policy ACCEPT)num  target     prot opt source               destination
Table: filterChain INPUT (policy ACCEPT)num  target     prot opt source               destination1    ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0           udp spt:500 dpt:5002    ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0           udp spt:50 dpt:503    ACCEPT     esp  --  0.0.0.0/0            0.0.0.0/0
Chain FORWARD (policy ACCEPT)num  target     prot opt source               destination
Chain OUTPUT (policy ACCEPT)num  target     prot opt source               destination1    ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0           udp spt:500 dpt:5002    ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0           udp spt:50 dpt:503    ACCEPT     esp  --  0.0.0.0/0            0.0.0.0/0
Table: natChain PREROUTING (policy ACCEPT)num  target     prot opt source               destination
Chain OUTPUT (policy ACCEPT)num  target     prot opt source               destination
Chain POSTROUTING (policy ACCEPT)num  target     prot opt source               destination1    MASQUERADE  all  --  0.0.0.0/0           !192.168.1.0/24
And my ipsec.conf:
config setup        nat_traversal=yes        virtual_private=%v4:192.168.1.0/24,%v4:!172.20.1.0/24        oe=off        protostack=netkeyconn os-to-cisco        connaddrfamily=ipv4        type=tunnel        authby=secret        esp=3DES-SHA1        ike=3des-sha1        forceencaps=yes        pfs=yes        compress=no        left=%defaultroute        leftid=x.x.x.x        leftsubnet=172.20.1.0/24        leftnexthop=%defaultroute        right=x.x.x.x        rightsubnet=192.168.1.0/24        rightnexthop=%defaultroute        auto=add
At this point, I'm not sure if it's a routing issue or a firewall issue. When I attempt to ping from Host A to Host B and perform a tcpdump icmp on the OpenSwan server, I don't see any traffic coming from Host A (however I'm not sure if I should). I have setup a static route on Host A pointing all traffic destined to 192.168.1.0 to the OpenSwan server. I've been working at this for 2 days now, have read countless forums and OpenSwan documentation, and am about out of ideas. Any assistance is much appreciated!!!
Thank you!
Trevor
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