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How to stop S2S IPsec DNS Leak?

Hello,

I have configured VPN Server on Sophos UTM over IPsec on S2S.

When i connect to the server using OpenVPN Client on my windows laptop, and run Extended test to check for DNS Leaks - http://dnsleaktest.com/ - I can see DNS servers and server detected see my Client ISP DNS'es.

Config is as follow:

OpenVPN Client "ISP A" -> WAN Sophos UTM Gateway "ISP B" -> Site to Site VPN Server over IPsec -> Office LAN -> WAN Sophos UTM Gateway "ISP B" -> Internet -> DNS LEAK containing DNS from ISP A and ISP B.

I would like to force limit DNS usage to ISP B on the office network. 

Whats the best way to configure Sophos UTM for that purpose, and how can i configure client to harden VPN communication?

Thanks.



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