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DNS routing, two different interfaces

Hi,

I have 2 external interfaces:

a) WAN

b) VPN concentrator

I have my static routing configured correctly to route traffic accordingly. Basically everything goes to a) except for some stuff, which goes to b) (a couple of specific networks).

Pings and access via IP works all nice. But I'd like to configure DNS in a similar way as well. In our internal network (internal interface (LAN)) we have our internal DNS server, which is also configured to forward everything to 8.8.8.8, this all works fine for a)

But out there in b) there are DNS servers that know how to resolve addresses in b). So I would like for resources on our internal network, to be able to use and dns name, and the dns resolution to be either handled by our internal DNS server, and if it can't resolve it (either from the internal DNS server or 8.8.8.8), it should then ask those DNS servers in b).

Is this possible?



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