TL> We don't recommend that you configure FORWARDERS on the
TL> secondary DNS server because all the clients will use the
TL> first DNS server by default. So the FORWARDERS on the
TL> secondary DNS server won't work until the first DNS server
TL> is down. Once the first DNS server is down, the clients will
TL> point to the secondary DNS server if it has been configured
TL> on the clients as the secondary DNS server.
You are conflating "preferred/alternate" with "primary/secondary".
<URL:
http://homepages.tesco.net./~J.deBoynePollard/FGA/dns-database-replication.html>
Forwarding will work (or not work) on the second DNS server
_irrespective_ of whether the first is up or down. The state of
the first DNS server has nothing to do with whether forwarding
works on the second. So your recommendation is based upon an
erroneous premise.
I recommend that the proxy DNS services, in both the first and the
second DNS servers that he has, be configured identically to each
other. In other words: If the first forwards queries to other
proxy DNS servers that are "closer" to Internet, so too should the
second (to the _same_ proxy DNS servers); and if the first performs
query resolution itself, so too should the second.
