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DNS question about forwarding & Zones

DNS question about forwarding & Zones

DNS question about forwarding & Zones

Hi, I work in a NT4.0 environment, we used use an external DNS server from our ISP, but later found this wasn't the best set-up, so I created a new DNS server and and put a forward on to it to point it to our external ISP's DNS server, which seems to work fine.  Howerver when I try resolve a name of a PC on our network using it's ip we get a strange name back link timlaptop.cmrr.umn.edu, it should be Bob's PC or something, so it seems it goes out to the external DNS server on to the internet to resolve this, what can I do to stop this?


RE: DNS question about forwarding & Zones

DNS names are not the same as Windows networking computer names.


RE: DNS question about forwarding & Zones

ok, maybe I didn't explain it properly, when I nslookup in an internal IP it resolves it from an external internet IP somewhere how can I stop this and keep it internally first?

RE: DNS question about forwarding & Zones

Have you created a PTR record for that device?  If not, a reverse lookup will not work correctly.  Also, if it is going out to the Internet DNS server and finding a name to resolve the IP to, what is the IP you are using - sounds like it might be a public IP.

If you want to stop your DNS server from going to the Internet DNS for resolution, disable Forwarding.

RE: DNS question about forwarding & Zones

Hi, all I have done is created a forwarder to our ISP's DNS server, so if it can't find a website etc on our LAN cached DNS server it goes to them, I haven't done anything with a reverse lookup, what do I do with that?


RE: DNS question about forwarding & Zones

Here's what I've done with our servers.  DNS servers have themselves listed and our external dns servers listed.  All clients have only our internal dns servers listed.  If clients don't find name resolution on internals, the internals go to the externals, then once name resolution is in cache, clients only`have to go to the internal servers.  Hope this helps, it works for me.  Good luck.

Glen A. Johnson
Johnson Computer Consulting

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RE: DNS question about forwarding & Zones

WS do not register themselves in DNS NT 4.0.  If you do not have an entry in DNS for each workstation you are needing to resolve, then the DNS has no choice but to look for it elsewhere.  Throw on a WINS server.  This will allow the users to register in WINS and the resolution for local workstations will be resolved.  

Hope this helps.


RE: DNS question about forwarding & Zones

To create a PTR record, you can do two things.  You can go to the specific host in the zone, double-click on the host name and then check the box, "Update Associated PTR Record".

The other thing you can do is go to the reverse lookup zone for that IP (if your subnet were then the zone would be 0.168.192.in-addr.arpa).  Add a new PTR record there.

RE: DNS question about forwarding & Zones

Throw on a wins server anyway.  It can speed up logging in even though microsoft say it is not needed.

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