Basic DNS Question

[Fred Elliot]

I have a 2K AD structure in place for a couple or years now and all seems
ok, I have an internal DNS server which is configured with a forwarder to my
ISP's external DNS server for external DNS requests (funnilly enough!!) all
my client on the LAN use the internal DNS server for name resolution.

A while ago I noticed that when I do an nslookup from an internal client I
get the following:

*** Can't find server name for address 172.16.0.14: Non-existent domain
*** Default servers are not available
Default Server: UnKnown
Address: 172.16.0.14

However, all lookups seems to work - except when I set type to MX?

Has anyone any ideas, I would of been expecting the Default Server to be the
name of my DNS server and that there would be no error on the first line.

Thanks

 

[Simon Geary]

Try installing a reverse lookup zone. nslookup will produce this error
message if one is not available. Read the error message again, what it is
trying to do is resolve an IP address of 172.16.0.14 to a server name, this
is a reverse lookup.

 

[Fred Elliot]

I'm not too sure what you mean, I have reserve lookup zones installed, this
error is occuring when I first run nslookup, usually nslookup when started
returns the name of the DNS server - this is not happening?

 

[Ace Fekay [MVP]]

In

I'm not too sure what you mean, I have reserve lookup zones
installed, this error is occuring when I first run nslookup, usually
nslookup when started returns the name of the DNS server - this is
not happening?

Then check and make sure there is a PTR entry for you DNS server IP address.
Upon intialization, nslookup is doing you a favor by trying to find the name
of your DNS server's IP address and it "looks" in the reverse zone.
Otherwise, you can ignore it and subsequent commans will work fine.

So in your case, your server is 172.16.0.14. Is there a PTR in your reverse
zone for that?

Also, if forwarding, maybe it's trying to resolve that with the SOA of who
owns the zone, but it shouldn';t since you said it';s created on your
machine, that is if it was created correctly.


--
Regards,
Ace

Please direct all replies to the newsgroup so all can benefit.
This posting is provided "AS IS" with no warranties.

Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
Microsoft Windows MVP - Active Directory

 

[Jonathan de Boyne Pollard]

FE> *** Can't find server name for address 172.16.0.14: Non-existent domain
FE> *** Default servers are not available

<URL:http://homepages.tesco.net./~J.deBoynePollard/FGA/nslookup-daft-error-message.html>