Resolving DNS queries for two disconnected, private, networks

Posted by Mikeage on Server Fault See other posts from Server Fault or by Mikeage
Published on 2010-03-21T07:35:22Z Indexed on 2010/03/21 7:41 UTC
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Filed under:

Windows

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linux

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dns

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networking

I'm trying to setup two PCs (one Windows, one Linux, but my understanding is that this problem is more DNS and less OS) as follows:

Home network: 192.168.1.0/24
VPN (via OpenVPN server not within the home network): 192.168.2.0/24 .

I would like a PC on both networks to be able to access three different types of site:

Internet addresses
Addresses on the home network
Addresses on the vpn

However, I'm not sure how/which DNS servers to use. If I prioritize my home DNS server, I can resolve (1) and (2), but not (3). If I prioritize my VPN DNS server, I can't resolve addresses of type (2). Of course, looking up addresses via nslookup and explicitly setting the correct server works, so I know my local DNS servers are OK.

Is there any way I can set up my PCs to fallback on the second DNS server if there is no response? Alternatively, is there any way I can tell different queries to go to different servers [maybe by setting up different subdomains; foo.local.something vs. bar.vpn.something]?

Thanks

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