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DNS issues with clients connected via AT&T VPN

Posted on 2013-01-23
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Last Modified: 2013-02-12
Hi,

I hope someone can help. I have an issue whereby, when clients connect to the VPN, I cannot ping them or access them via their computer name. This means that when the helpdesk are trying to troubleshoot issues, they have to get end-users to find out their VPN IP address.

I have just tested it with a new client (XP but most are Windows 7). I joined the client to the domain then disconnected it from the corporate network. I connected it to a broadband connection then connected to the VPN. I then tried to ping it by its name from my machine. When I do this I get:

Reply from 10.132.1.185: Destination host unreachable.

10.132.1.185 is my machine that I'm pinging it from so I'm a bit confused by that. So I then tried pinging from another internal server on our network, and it just times out.

I did an NSLookup on the client and it is using our internal DNS server and resolving names correctly. I also checked the bindings and the VPN adaptor is at the top.

Does anyone have any ideas how to resolve this?

DCDiag /test:DNS checks out fine.

Thanks.
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Question by:wiggumc
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Rob Williams earned 500 total points
ID: 38810250
With a VPN connection, even choosing "register this connection's address in DNS", on the connecting  client does not usually allow the connection to register in DNS.  If it did, it could be problematic as each time the client connects they could have a different IP and DNS, if scavenging is enabled, generally only does so every 7 days so you could have many  DNS entries for the same client.

I am not familiar with the AT&T VPN, but with a Windows VPN you can look in RRAS to match the clients login name (not the PC name) with their IP, and you can do the same in the VPN logs for many other types of 3rd party VPN's.  This is usually the best option.
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