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PPTP VPN and routing

Posted on 2012-03-15
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Last Modified: 2012-03-23
I have a dial up VPN setup using RRAS on a Server 2008 machine.  I have no problem connecting and getting an on the local network.  

My problem is that we have a separate subnet in our environment which users can't seem to get to through the VPN.  

Primary subnet: 10.10.10.0/24
Second subnet: 10.10.20.0/24

If I connect using a WinXP machine, I can ping any address on the primary but not the secondary.

If I connect using a Win7 machine, I can ping any address on the primary and the secondary.

Funny thing is that occassionally, the WinXP machine will get a ping response back from a device on the 10.10.20.0 network.  

Am I missing something in the XP configuration?  I've dupliated the setup on the XP machine exactly the same as the Win 7.  The option for "Use default gateway on remote network" is disabled" as internet performance is brutally slow if we enable this option.

If I enable the "Use default gateway on remote network" on the XP machine, I do get ping responses back from both subnets but we are trying to find a way to avoid this.
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Question by:K2NS
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Expert Comment

by:cantoris
ID: 37734541
If you're not using a default gateway on the remote network then you will need to add a static route to the XP machine to tell it that the other subnet is obtainable down the VPN link too.  If you look online, you'll see this is fraught with difficulty.

You may need to use the CMAK to do this.
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Accepted Solution

by:
K2NS earned 0 total points
ID: 37734544
I actually figured out how to do the routing properly.  Basically, the user has to have a static IP assigned for the VPN dialup in ADUC.  Once you've assinged an IP address, a static route has to be added to the user's machine (XP based machines only as Win 7 seems to route it properly).  The static route's gateway has to match the static IP you've assigned and since it should never changed, a persistent route can be created and there is no issue with the user getting a different gateway address the next time he connects.
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Author Closing Comment

by:K2NS
ID: 37756251
Problem was resolved.
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