VPN client can ping the VPN
Situation: one of our
clients setup a VPN on windows server. The VPN client can ping the VPN
server without problem. However, they can’t access other network resources
and ping receives ”time out” message.
Investigation: 1. The
Windows server is behind a router with PPTP pass-through.
2. The server comes with two NICs and both are enabled.
3. The ipconfig /all display both NICs’ IPs are in the
same IP range, 10.0.0.0/8.
Analysis: Any windows
multihomed servers should not use the same IP range if it comes with two or
more NICs. In general, if you have a router or firewall protecting your
LAN, you can create a VPN using just one NIC; if you don’t have a router or
firewall protecting your LAN, you should enable RRAS on a Windows server
with two NICs using the different IP ranges. In some cases, you may want to
have more secure LAN even the LAN is behind a router or firewall, you can
setup a Windows server as VPN using two NICs. But, they must be in the
different subnets. For example, one NIC is 192.168.0.2/255.255.255.0 and
another is 10.0.0.2/255.0.0.0.
How to setup VPN
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