[Openswan Users] L2TP/IPSec Windows XP Connected but no Traffic

[Peter McGill]

I setup a L2TP/IPSec X.509 connection from my Windows XP Home laptop,
to my Linux 2.4.31 Openswan 2.4.6 xl2tpd 1.1.05 office server.

When I ping the private ip of the office server from the laptop, with the connection
up, using tcpdump on the server, I can see the pings coming and going on the,
ppp0 interface, and the l2tp packets on the ipsec0 interface, and the esp packets
on the eth1 (my public) interface. So everything in the linux server appears to be
fine.

The windows firewall is disabled, however I'm still not receiving any responses back.
So windows is obviously sending through the vpn ok, but not receiving properly.
Any suggestions? I'm stumped.

Peter McGill
Software Developer / Network Administrator
Gra Ham Energy Limited