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Microsoft DNS requests orders

Posted on 2010-01-07
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Last Modified: 2012-05-08
Microsoft DNS requests orders

1-Can someone describe the DNS requests in orders?
for instance, when the client makes a DNS request, will it look first to its DNS cache,then to host file then to the preferred DNS server specified in the TCP/IP settings of the network adapter,then to DNS forwarders?

2-in the forwared tab if I have a zone XZONE.com that is hosted on DNS1(10.10.10.10) and DNS2(11.11.11.11) and I want the zone to be resolved always by the DNS1(10.10.10.10), in this case putting the 10.10.10.10 on top of the list in forwarders would make DNS1 first  resolve the requests for XZONE.com and DNS2(11.11.11.11) will be used just in case DNS1 is down?

3-if a client is using hostfile for a certain zone.
which command should I run to show that the client is using host file for a certain zone instead of a DNS server?
Thanks

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Question by:jskfan
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by:Chris Dent
ID: 26202470

1. Client:

a. Cache
b. Hosts File
c. Server

The rest of the work is done by the server, the MS DNS Client is a Stub Resolver, it's not capable of more than passing it on.

The server will then do:

a. Cache
b. Local Zones
c. Forwards (if configured)
d. Root Hints (if not disabled)

2. In case DNS1 is down or does not respond within the time-out period (typically a couple of seconds).

3. No such command I'm afraid. The hosts file will only be used if you let the DNS Client find the name. NsLookup on the other hand will never bother considering local cache or hosts file.

You could monitor network traffic and discover that the response was not provided across the network, but it would be far far quicker to check the Hosts file itself.

Chris
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by:jskfan
ID: 26210985
2- in the forwaders tab, does it matter the order of the DNS IP addresses entered for the same zone name?
for instance XZONE.com is hosted on DNS1(10.10.10.10) and DNS2(11.11.11.11) and I want the zone to be always resolved  by the DNS1(10.10.10.10), Do I need to put the 10.10.10.10 on top of the list and 11.11.11.11 on the bottom?
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by:jskfan
ID: 26359670
any updates??
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Chris Dent earned 2000 total points
ID: 26359734

Sorry dude, completely lost track.

2. The order matters, the first is used preferentially, if that times out the second is used.

You won't be able to guarantee that it only ever uses 10.10.10.10 if both are listed, however it will most of the time.

Chris
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by:jskfan
ID: 26408764
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