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DNS Issues

i am seeing some strange DNS isssues. We have two AD integrated DNS Windows 2008 R2 servers and a non-AD DNS. The Non-DNS is used for non AD and non truseted systems. It does however copy the information from the AD DNS servers. Just doesn twrite to them. Once a week a get servers loosing thier DNS registeration and I ahve to go into the server by ip and run an ipconfig /registerdns before it shows up again. Any thoughts?
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bdseymou
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bdseymou
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1 Solution
 
Adam BrownSr Solutions ArchitectCommented:
Might want to check the DNS Properties of the TCP/IP v4 properties on the NICs. Go to the Properties screen of the NIC -> Internet Protocol Version 4 -> Properties -> Advanced -> DNS Tab -> Make sure Register this connection's addresses in DNS is checked.
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bdseymouAuthor Commented:
This is set on all the servers already.
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bdseymouAuthor Commented:
What port needs to be opened for DNS to reach the client?
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Adam BrownSr Solutions ArchitectCommented:
DNS uses port 53. You may also want to check your DNS scavenging settings. If scavenging is set to occur too frequently, the DNS server may be deleting the records before the servers can refresh it. At the very least, a work-around for the issue you're experiencing could be to create static DNS records for all of your servers and devices that aren't obtaining addresses from DHCP.
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AkeenerCommented:
Be sure the DHCP Client Service is running on the Servers not registering their IP. If the Service isn't running and you get a Access Denied error trying to start them, Open Regdit and go to HKLM\system\CurrentControlSet\Services\Dhcp and make sure Local Service and Network Service has permissions. If not add them.
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Adam BrownSr Solutions ArchitectCommented:
Akeener, It's usually best to avoid using DHCP to assign IP addresses to servers. Servers should really have static addresses (particularly DCs and Exchange servers). If servers are set with Static Addresses, the status of the DHCP client service won't affect anything.
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AkeenerCommented:
Its the DHCP Client Service and needs to run on all systems. Its not assigning the IP, but its this service that also updated the DNS record.
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bdseymouAuthor Commented:
Okay so I am aware of the DHCP Client and that it needs to run on all the servers and is. The servers are assigned a static IP which should be set in DNS to not scavenge but seems to be.

As for more info on the DNs setup. I only have scavenging running on one of the AD servers. The zones are set for no-refresh interval of 7 days and a refresh of 6 hours. The Enable Automatic scavenging of stale records is set to 7 days under the server properties. The non -AD DNS server for non-AD related object is also set the same.

the NON-AD gets information from the two AD DNS servers and also hosts zones for external stuff.

I am not sure why the DNS records for servers would disappear.

@acbrown2010: I thought that 53 was the case and that is opened bi-directional.
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bdseymouAuthor Commented:
Okay so I went through the DHCP server and set the Leases to 8 days default and then set the no-refresh to 7 and the refresh to 7. See if going back to default helps since i am not understanding the 7 and 6 that was set.
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bdseymouAuthor Commented:
I had previously tried what others were suggesting before asking for help.
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