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Why is my VPN issuing a strange SubNet Mask?

Posted on 2008-11-03
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Last Modified: 2012-05-05
I log onto my VPN, I run ipconfig, and it gives me a proper IP address, but the subnet mask is 255.255.255.255, whats going on? I cannot find neither on the client or server side any spot where I can specify subnet mask for the VPN connection.
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Question by:CF_PRO
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by:theras2000
ID: 22872381
I think that's normal mate.  Just like a dialup connection.  Your gateway is the same as your IP right?
I always figured it was a secure way to make sure the clients can't communicate with each other.
I'll go install one now and see what I get.
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by:CF_PRO
ID: 22872410
I get assigned 192.168.5.240 / 255.255.255.255 / no gateway (I told it that)
I am not able to access my webserver sitting on 192.168.5.2 (I am able to access it on the server itself, but not from the VPN client side)
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by:theras2000
ID: 22874747
Yeah you're right, no gateway.  I was finally able to connect to my company's vpn using the Cisco VPN client.  Although I got a mask of 255.255.252.0 (which is what we normally use at work).  Some quick googling has shown me that certainly is common for VPNs to get all 255s like you have, for security reasons.  A few notes have suggested it could it be permissions on the VPN server or something.
Anyway I obviously don't have enough xp with VPNs and I know there's a million different ways to set them up, so I'll get out of the way and hope someone else can help you.  Can you ping anything BTW, like the VPN server or the webserver?
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by:CF_PRO
ID: 22877692
I can ping some things, but I cannot reach across other subnets.  (I am able to when I am physically logged on the file server where VPN is being hosted).
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theras2000 earned 2000 total points
ID: 22879420
Hmmm, well then it sounds like the VPN is OK and it may just be your routing that's not right.  Sounds like your routing box is not letting people from on the VPN network get across to other LANs.
Pardon my lack of knowledge as I've never setup a VPN server, but have you done it on Win2003?  And do you have the RRAS role installed?  If my guessing is correct, then this is where you could alter the access.

See this guy here has the same mask thing as you http://www.tech-archive.net/Archive/Windows/microsoft.public.windows.server.networking/2008-10/msg00114.html but I think his situation and solution are different to you anyway.
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by:CF_PRO
ID: 22879514
I am thinking I need to setup a static route, but I dont have enough experience to say for sure.
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by:theras2000
ID: 22879796
me neither
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by:theras2000
ID: 23024432
Hey did you solve it in the end?  Thanks for the points.  It'd be nice if you could post what you did, so that people can look here for the solution in years to come.
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by:CF_PRO
ID: 23024873
Nope, nobody was able to help me figure out the problem.  I tried updating my routing table with deleting and adding entries and that did not work either, so I gave up on it.  
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