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Cisco VPN Client using wrong DNS server

Posted on 2010-11-16
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Last Modified: 2012-05-10
Hi All,

I am having a strange issue with a number of our Cisco VPN clients.  The VPN clients connect into a Cisco ASA 5510 which is setup to send all traffic for clients via the company network. I.E no split tunnelling!

This works fine for 90% of the clients but strangely the othe 10% are using their local DNS (rather than the company DNS servers) when connected.  Consequently they cannot connect to any company servers etc by name - i.e intranet and mapped drives don't work.

We have tried a number of versions of the VPN client including the latest and are not closer to a solution - does anyone know how to resolve this?!

Many thanks

Rob
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Question by:robclarke41
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by:Anglo
ID: 34145019
WHat OS are they using?  We have had DNS issues with Vista & 7 and have to disable IPv6 on the network interfaces.
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by:robclarke41
ID: 34145029
We are using XP so are not having any IPv6 problems
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diprajbasu earned 500 total points
ID: 34145113
There is a known and old problem within Windows, where it will by default query "local" DNS servers before it queries DNS servers that are on "WAN" (which is what VPN connections appear to be) links.

Refer to : http://support.microsoft.com/?id=311218

You can try using the script here:

http://blogs.technet.com/brucecowper/archive/2005/03/28/403043.aspx

that will change the binding order.  This will cause the DNS queries to go to the DNS servers provide the the DHCP server of for the VPN.  Please note that any unqiue host names resolved by the "local" DNS (192.168.1.5) will NO longer get resolved properly unless they are also defined on 10.21.0.100.


docs from EE
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by:diprajbasu
ID: 34145127
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by:robclarke41
ID: 34145700
That was it thanks!
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