[Openvpn-users] strange routing issues with 2 LANs

[Silver Salonen <silver@xxxxxxxxxxxx>]

Hi.

I've tied together multiple LANs with OpenVPN: there's an OpenVPN server (with 
device tap and bridging) running on FreeBSD-6.1 (with PF firewall) and 2 
clients running on Windows 2003. 
LAN behind FreeBSD is 192.168.1.0/24, LANs behind Windowses' are 
192.168.2.0/24 and 192.168.3.0/24.

The Windows machines are not gateways so there are static routes in these 
LANs' default gateway to route all the traffic for 192.168.1.0/24 into that 
Windows machines. In FreeBSD (which happens to be a default gateway for 
192.168.1.0/24) there are also routes for the other LANs to route these 
through OpenVPN ;)

OpenVPN connections are established and everything seems to work.. well, 
almost :)
The strange issue is that even though LAN behind the FreeBSD (192.168.1.0/24) 
can be reached perfectly by these 2 other LANs, machines in these other LANs 
can't be pinged: tcpdump on tap0 shows me that packets go to the servers, but 
nothing comes back. Once I try to reach some TCP port of the same machines I 
tried to ping, connection is established and after that I can even ping it.

So I'm wondering why is it so - is the problem in PF states or these Windows 
machines being OpenVPN clients. Any thoughts, suggestions for what I might 
try?
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