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VPN DNS problem - 1.Jul.2008 11:57:57 AM

dranizz

Posts: 23
Joined: 5.May2008
Status: offline

I have a trouble that suddenly happend out of nowhere. My Windows XP VPN clients cannot resolve the computers name in the internal network. But Windows Vista VPN clients can do it. Even when using complete names Computer1.domaine.com

What can it be?

Thanks

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RE: VPN DNS problem - 5.Jul.2008 11:57:02 AM

tshinder

Posts: 46971
Joined: 10.Jan.2001
From: Texas
Status: offline

When you do a nslookup on the XP VPN clients when connected, what do you see?

Tom

_____________________________

Thomas W Shinder, M.D.
Sr. Consultant/Technical Writer
Prowess Consulting http://www.prowessconsulting.com/
Blog: http://blogs.isaserver.org/shinder/

GET THE NEW ISA 2006 Book!: http://tinyurl.com/2gpoo8

(in reply to dranizz)

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RE: VPN DNS problem - 7.Jul.2008 4:11:16 PM

dranizz

Posts: 23
Joined: 5.May2008
Status: offline

I get the external NIC card IP address. Not an actual internal server ip.

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RE: VPN DNS problem - 7.Jul.2008 4:15:47 PM

dranizz

Posts: 23
Joined: 5.May2008
Status: offline

and when I do it in Vista, I get the corrects ip address, my internal DNS and the server im looking for.

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Post #: 4

RE: VPN DNS problem - 8.Jul.2008 11:00:31 AM

dranizz

Posts: 23
Joined: 5.May2008
Status: offline

My god this is ackward.

I've tried many things, like configuriing the Internal DNS server ip manually on the VPN connection on the client, it did not work. But when I returned to DHCP option, it made a difference. Now I can nslookup any server. But it still bugs me.

I use the "Use the default gateway" option on the VPN connection. Using this was working correctly untill recently. Now when I uncheck it, I can't resolve any internal computer names, if I check it, it works perfectly. Until recently, I did not have to check on uncheck it to make it work, it did work in both situation...

Thanks for the help

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Post #: 5

RE: VPN DNS problem - 10.Jul.2008 9:47:01 AM

dranizz

Posts: 23
Joined: 5.May2008
Status: offline

Ok, now I know. It's the split DNS VPN issue. Seems that Microsoft fixed that in Vista.

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Post #: 6

RE: VPN DNS problem - 10.Jul.2008 3:21:23 PM

dranizz

Posts: 23
Joined: 5.May2008
Status: offline

I still don't know what happened tho. I think it was working before... Anyone have any ideas?

Thanks

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Post #: 7

RE: VPN DNS problem - 11.Jul.2008 10:36:43 AM

tshinder

Posts: 46971
Joined: 10.Jan.2001
From: Texas
Status: offline

I know what you mean. It almost seems random. However, if you implement the fix in Stefaan Pouseele's blog, you'll fix it permanently.

HTH,
Tom

_____________________________

Thomas W Shinder, M.D.
Sr. Consultant/Technical Writer
Prowess Consulting http://www.prowessconsulting.com/
Blog: http://blogs.isaserver.org/shinder/

GET THE NEW ISA 2006 Book!: http://tinyurl.com/2gpoo8

(in reply to dranizz)

Post #: 8