have a look at NRPT (which is "name resolution policy table")

https://technet.microsoft.com/ru-ru/library/ee649207%28v=ws.10%29.aspx

however, openvpn doesn't yet support that

2015-01-20 15:56 GMT+05:00 Frank, Petric (Petric)
<petric.fr...@alcatel-lucent.com>:
> Hello,
>
> this is not exactly a OpenVPN problem.
>
> I connect via VPN to a network (own subnet). There is a DNS server serving 
> hosts of some (specific) domains in this subnet.
>
> Problem is how to keep the locally configured DNS, but tell the system to ask 
> the DNS behind the VPN tunnel when it requests hosts from the (known) domains 
> of this DNS server.
>
> For example:
>   Lookup of google.com -> ask preconfigured DNS
>   Lookup of *.local.dom -> ask DNS behind VPN tunnel (local.dom is managed by 
> him)
>
> As far as I know I can only replace the configured DNS server by adding the 
> line
>   push "dhcp-option DNS a.b.c.d"
>
> but I would like to have something like
>   push "dhcp-option DNS local.dom a.b.c.d"
> telling that all lookups of local.dom should be directed to a.b.c.d.
>
> I don't know whether this is possible as such.
>
> Local host is Windows 7
> VPN server is Linux
>
> Regards
>   Petric
>
>
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------------------------------------------------------------------------------
New Year. New Location. New Benefits. New Data Center in Ashburn, VA.
GigeNET is offering a free month of service with a new server in Ashburn.
Choose from 2 high performing configs, both with 100TB of bandwidth.
Higher redundancy.Lower latency.Increased capacity.Completely compliant.
http://p.sf.net/sfu/gigenet
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