Query next server if unresolvable

[Guest]

Situation:

Server with a public in, a public out and a private interface. External DNS
must be the prefered DNS Server in Nameserver order since we dont want to
stress the internal dns too much. but i have to be able to resolve both,
public and private hostnames. the public dns of course cant resolve internal
hosts. i dont want to enter all the hosts into a hostfile since they change
frequently.

i added the internal dns as 2nd dns server but if i understand it correctly
the dns query ends if the client gets answer from the 1st server that the
host is unresolvable and querys to the 2nd server only if 1st one isnt
reachable within timeout period.

i dont want to install a local dns server on this one. can i configure the
dns client somehow that the client queries the 2nd dns server if 1st one
responds unresolvable ?

thx in advance

Peter

 

[Kevin D. Goodknecht Sr. [MVP]]

Situation:

Server with a public in, a public out and a private interface.
External DNS must be the prefered DNS Server in Nameserver order
since we dont want to stress the internal dns too much. but i have to
be able to resolve both, public and private hostnames. the public dns
of course cant resolve internal hosts. i dont want to enter all the
hosts into a hostfile since they change frequently.

i added the internal dns as 2nd dns server but if i understand it
correctly the dns query ends if the client gets answer from the 1st
server that the host is unresolvable and querys to the 2nd server
only if 1st one isnt reachable within timeout period.

The DNS client service gives the Preferred DNS server one second to respond,
if it responds with either a positive or negative answer, the query stops.
If the preferred doesn't respond, then the query goes to the Alternate, if
the Alternate responds with any answer, the DNS client will begin using the
Alternate DNS as the preferred DNS until TCP/IP is reset or the system is
restarted.

i dont want to install a local dns server on this one. can i
configure the dns client somehow that the client queries the 2nd dns
server if 1st one responds unresolvable ?

If you have an internal and an external DNS server, the internal DNS server
should be the ONLY DNS server you should use on internal clients, especially
if you are in an Active Directory environment.

The internal DNS can forward to the external DNS to resolve domains that do
not exist on the internal DNS. But do NOT forward back to the internal DNS
or you will be setting up a DNS loop.

300202 - HOW TO: Configure DNS for Internet Access in Windows 2000
http://support.microsoft.com/?id=300202&sd=RMVP

825036 - Best practices for DNS client settings in Windows 2000 Server and
in Windows Server 2003
http://support.microsoft.com/default.aspx?scid=kb;en-us;825036&sd=RMVP

323380 - HOW TO: Configure DNS for Internet Access in Windows Server 2003
http://support.microsoft.com/default.aspx?scid=kb;en-us;323380&sd=RMVP