From the native Windows dialog under network connections you can already
click on an adapter and configure multiple DNS servers. Windows will
however only query the next DNS server in the list, if the first DNS
server is not responding. This means that if the first DNS server is
responding but unable to resolve a name, Windows will NOT proceed to
the next server in the list.
...and the solution is?
MultiDNS is a local DNS server that redirects DNS queries to one or more
DNS servers. MultiDNS stops when a successful response is returned or when
all servers in the list have been queried. MultiDNS can be installed on
a laptop or on a server.
Typical scenarios where MultiDNS is used:
On end user laptops in conjunction with remote VPN, thus enabling
remote users to access computers/servers on both networks by name
On servers or end user laptops that need to access multiple NAT
segments that are connected via VPN or other private links. For
example multiple disjoint AD structures.