I am trying to configure a site-to-site VPN between TMG 2010 (Local, ext. 126.96.36.199) and Windows Server 2008 R2 RRAS (Remote, ext. 188.8.131.52) //both IPs are fake for just an example.
The internal network protected by TMG is defined as following:
Internal [network] object is defined as a scope of 192.168.112.1 - 192.168.112.240
The scope of 192.168.112.241 - 192.168.112.254 is reserved for a client-to-site VPN which works perfectly.
At the other side there is a RRAS with the defined internal network 192.168.111.1 - 192.168.111.254.
I created a site-to-site VPN between two external interfaces as suggested by TMG/RRAS guidelines and now I am trying to ping/tracert internal machines in both networks. However all attempts in either way fail with "Request timed out". I assume the packet might
even reach the destination but doesn't know the route back. I have no clue what (static?) routes I shall define on both VPN servers to make packets return.
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