DNS Forwarding

  • Thread starter Thread starter compunow
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compunow

I have two DNS servers setup. Primary and Secondary. The secondary is setup
to forward from the ISP's two DNS servers. I have to configure the Secondary
as the first DNS in Ipconfiguration or DHCP to access the Internet. The
Secondary DNS server is just a copy of the Primary. If I place the primary
first in Ipconfiguration or DHCP it will not allow me to access the
Internet. Should the Primary be queried first and the secondary with
forwarding enabled and no recursion?

compunow
 
Generally both the Primary and the Secondary (as you have
described them) should both FORWARD TO the same
forwarders on the Internet.

This is the root of your problem in resolving the Internet
namespace -- one server forwards correctly while the other
does not.

Clients make no "CONTRACT" nor "PROMISE" about whether
they will query the first or second DNS listed -- they do typically
try the first one listed first, but they will switch if the other is faster
or more reliable at answering.
 
I think Herb nailed the problem for you.
I'd suggest that you enable DNS forwarding on both Primary and Secondary
DNS servers so that you have a redundant environment and the clients will
be able to resolve hostnames even if one of the DNS servers is offline.
----
Thanks,
Rakesh Chanana [MSFT]

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