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Device domain name is not consistant in DHCP

Posted on 2011-03-08
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Last Modified: 2013-11-13
Under the list of leases in DHCP, not all of the devices appear with the same domain extension.  For example, one device may be named device1.domain. and another named device2.publicdomain.com.  One has a 'com' and one does not.  The one with the .com is the domain address as it appears publically.  Why is this?  Is it normal?  Is something wrong?
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Question by:tmaususer
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Expert Comment

by:vivigatt
ID: 35082271
This depends on how your devices are treating DNS registration.

Check in TCPIP settings/advanced/DNS.
This is a settings for each client (device) .
You can also configure DHCP option 15 (domain name) but, depending on each client's behavior, this.will be taken into account differently
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Author Comment

by:tmaususer
ID: 35083468
I am a little dense this morning.  I am not sure where  to find 'TCPIP settings/advanced/DNS'.
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Expert Comment

by:vivigatt
ID: 35083634
On windows, in network properties.
Select the network card that gets the IP configuration from DHCP.
Properties
Select TCPIP protocol
Properties
Advanced
DNS
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Author Comment

by:tmaususer
ID: 35083773
I entered the address of our DNS servers and did an ipconfig /flushdns on the client.  That didn't seem to help.  I will try checking the DHCP option 15.
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Author Comment

by:tmaususer
ID: 35083818
Here is what I have. (i took i ip addresses out)
Snap9.bmp
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Author Comment

by:tmaususer
ID: 35083870
option 15 (DNS domain name) is set to publicdomain.com
option 40 (INS domain name) is set to domain.
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vivigatt earned 1000 total points
ID: 35084621
Option 40 is NIS domain name.
Do you have a NIS infrastructure ?
NIS is also sometimes called "YP or Yellow Page):
http://en.wikipedia.org/wiki/Network_Information_Service
AFAICT, mostly Unix based devices are using NIS. I don't think that NIS can interfere here...

Now for your settings, as they appear in DHCP lease, it depends on how the client registers its own DNS entry.
If you want the Option 15 supplied domain information is the one in use, you should check the option "use this connection's DNS suffix in DNS registration".
This can be pushed with policies.

Now beware, if your computers are domain members, the domain name will be appended to some of the DNS entries.
You can check what is the domain entry in "Computer Name" tab of "System" property:

 PC-name1a.jpg


But if you check the option, "use this connection's DNS suffix in DNS registration", you should always get the DHCP option 15 as the "domain" part in the list of DHCP leases
 
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