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I got a problem configuring my company network. The situation is difficult because there are 2 companies with two ISP connections but using the same file server. No security or administrative tool was involved until now, only two subnets and two Win workgroups were used. I would like to introduce a DC (one AD for the two companies, because they are connected in business and have the same owner) and I would like to configure the two companies to use the two different ISP services. How should I configure the network? My idea is that I will create (actually it's already done) two subnets with to default gateways and each connects to a LAN port of the DC. The problem I found that the second subnet simply can't find the DC, at least the DNS does not work. How should I configure my DNS or how should I reconfigure my whole network? Thank you for the suggestions.

András

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I thougth you should install 2 domain controllers in each location (same domain), establish VPN connection between domain controllers and specify a routes to access form one network to other. Configure DNS in the following way: first DNS to own subnet DNS (installed on DC or any other server in subnet), second one to remote and each ISP DNS in forwarders list.

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If each site has 2 DCs, why would you put a remote DC in as your second DNS server? Use the second local DC. –  ThatGraemeGuy May 5 '13 at 20:01

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