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While my WinXP box (in a test DMZ area, 192.168.1.15) can connect to my Debian (Sarge) server on my LAN (10.42.42.146), I cannot access other servers on the LAN. (Which, of course, is the whole purpose.)
I can ping over the VPN to the server (10.42.5.1), but I cannot ping to other internal boxes (e.g. 10.42.42.20, which is pingable within my LAN).
Since an initial connection and a direct ping work just fine, I belive my firewall is directing 188.8.131.52.75 UDP:1194 to 10.42.42.146 just fine.
I have executed the following on the Debian server, which should allow for packet forwarding:
key server.key # This file should be kept secret
server 10.42.5.0 255.255.255.0
push "route 10.42.42.0 255.255.255.0"
keepalive 10 120
remote 192.168.1.75 1194
0x1 ........................... MS TCP Loopback interface
0x2 ...00 ff 70 6c 63 de ...... TAP-Win32 Adapter V8 - Packet Scheduler Miniport