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ASA & Router VPN (DNS Issues)

Posted on 2008-09-30
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Last Modified: 2012-05-05
Hello All,

Back again&

Ok I have a L2L vpn going between an ASA5505 and a Cisco 851W router. I am having problems with the DNS (split DNS?).  Note: the 851 is the DHCP server.

When going to the internet I would like the clients to use the ISP DNS servers, when access domain names that exist over the VPN I will need the client to use the DNS behind the ASA.

Any help? Thanks!!
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Question by:dehmerl
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Expert Comment

by:Pugglewuggle
ID: 22608799
You need an Internal DNS server for everything. Just setup your internal DNS server to "forward" requests to the internet. The ISP's DNS servers when configured in your DNS server should be setup as "forwarders".
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Author Comment

by:dehmerl
ID: 22608862
Sorry - I may have been a little misleading...
I do not have a DNS server on the LAN side of the 851, it is for a single person remote office. I need the LAN clients on the 851W to have access to the DNS server back in the Corporate office, when I was reading about split DNS it sounded like I could setup something that said for mydomain.com look at corporate DNS  otherwise use ISP DNS servers. I have to admit I have never done that and I am still not sure how after reading about it.
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Pugglewuggle earned 2000 total points
ID: 22609128
You don't need split DNS. Just setup the user behind the 851W to use the IP of the local DNS server at the main office as it's DNS server. This will then work and allow the user to access internal resources by DNS name and internet sites as well (assuming that split tunneling is setup or you have a proxy server).
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LVL 12

Expert Comment

by:Pugglewuggle
ID: 22609136
When I say split tunneling I mean on the 851W. This allows internet access AND secure access to the corporate LAN. Still use the corporate DNS server for everything though.
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Author Closing Comment

by:dehmerl
ID: 31501691
Ok, I will go with that!

I now have the clients accessing DNS only via the VPN and it seems to be working just fine.

Guess I was just looking to over complicate things!

Thanks!
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Expert Comment

by:Pugglewuggle
ID: 22609799
No prob! :-)
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