DNS Request Routing Over IPsec

I hope this is the right spot for this. I did a ton of searching but came up empty. Closest I found was this but there was never a solution.

I'm trying to get DNS queries to our work LAN to route through the VPN tunnel. So if I ping say server.work.lan it should resolve to that IP address through the IPsec tunnel. However this isn't working. I can access all machine on the work LAN through the tunnel via IP but DNS requests aren't working. I have the routing defined to look at our 3 DNS servers at work.

I think I know where the problem lies but am unable to fix it. If I try to ping one of the work DNS servers by IP from the Astaro box itself I get a:
where the 71.x.x.201 is the IP address of my WAN interface. It seems that Astaro isn't using the IPsec tunnel for requests that originate from itself.

Is there a way to fix this so that the Request Routing works as desired? I'm running the latest version, 9.003-16. Thanks so much!