Domain controller IP Address has intermittent connection issues

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BonnieWhalon-5214 asked Nov 9, '20 BonnieWhalon-5214 answered Nov 10, '20

Domain controller IP Address has intermittent connection issues

This domain controller has been running for three years. It is a standalone Windows Sever 2012R2. It is used for Active directory and file and print sharing.

It has been dropping packets for a couple of days. At first we felt it was the issue with the ISP, had them put new lines from the pole. Stopped for about 8 hours and started again. We tried several other diagnose and thought it was the ethernet card. The system has two ethernet cards.

Card 1 IP Address 192.168.1.2 -- Static Ping losing packets.
```
  Card 2 No IP Address and disabled
```

  Configured Card 2-- IP Address 192.168.1.3 and disabled Card 1

  Connected the cable to it.  The system stayed up and running for 24 hours.

```
  Static Ping no loss of packets
```

  Issue is the DNS server is on  IP Address 192.168.1.2.

  Tried to change the IP Addresses making Card 2-- 192.168.16.2 and it started dropping packet again.

  Note:  Each time I have disabled the card not being used.

  Configure the original Card 1 IP Address 192.168.16.3 and put the ethernet cable back into it.

  Have been receiving a static ping internally and externally without error.

  Enable Card 2 --IP address 192.168.1.2 have no network wire in it

  Issue I need the DNS so the server can see the workstations.

I have a couple of questions:

 Is there away to forward 192.168.1.3?
 Can I move the DNS to 192.168.1.3 on the domain controller? 
 The only change on this network was an external IP Address change!

This is an emergency management system and I must keep it up and running. Can you point me in the right direction to get help. Your help is greatly appreciated.

windows-server-2012 windows-dhcp-dns

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Answer 1 · 2020-11-09T19:48:08.597Z

DSPatrick answered Nov 9, '20

Please run;

Dcdiag /v /c /d /e /s:%computername% >c:\dcdiag.log
repadmin /showrepl >C:\repl.txt
ipconfig /all > C:\dc1.txt
ipconfig /all > C:\dc2.txt
ipconfig /all > C:\problemworkstation.txt

then put unzipped text files up on OneDrive and share a link.

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Answer 2 · 2020-11-09T14:27:31.027Z

DSPatrick answered Nov 9, '20 BonnieWhalon-5214 commented Nov 9, '20

Multi-homing a domain controller will always cause no end to grief for active directory domain DNS. I'd disable the second NIC, then do ipconfig /flushdns, ipconfigregisterdns, restart the netlogon service.

--please don't forget to Accept as answer if the reply is helpful--

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BonnieWhalon-5214 · Nov 09, 2020 at 07:36 PM

I'm sorry, I must not have explained this correctly.

I do not want to do multi-homing. I only have one network wire installed.

The network IP address was 192.168.1.2. When doing a static ping on this IP Address on either card loses packets.
When changing the IP address to 192.168.1.3 No packet are lost.

It is a Domain Controller with DNS installed and when I try to change it; the server states the IP Address cannot be changed. I understand there is a way to change the number using Power Shell. I would rather not.

I have never heard of an IP # becoming corrupt what could cause this issue?

0 ·

Answer 3 · 2020-11-09T23:18:17.607Z

BonnieWhalon-5214 answered Nov 9, '20

https://1drv.ms/u/s!Agucruy6CbKnj1KNfkUdUTqmQqnn?e=9u4jMs

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Answer 4 · 2020-11-09T23:24:44.943Z

DSPatrick answered Nov 9, '20

Police01 remove the public DNS (75.75.75.75) from connection properties, then do ipconfig /flushdns, ipconfig /registerdns, then restart the netlogon service. If problems persist then put up a new set of files to look at.

--please don't forget to Accept as answer if the reply is helpful--

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Answer 5 · 2020-11-10T12:23:27.297Z

BonnieWhalon-5214 answered Nov 10, '20

I want to thank you for your help. The issue was the router needed the firmware updated. You helped me confirm this. The server has been up and running all night without loosing the internet intermittently. When I remove the public DNS Address from the network card I do loose my ability to connect to the server. I need to go through a workstation and do remote desktop.

Thank you again.

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Answer 6 · 2020-11-10T13:30:47.75Z

DSPatrick answered Nov 10, '20

A domain controller needs to have own static ip address plus loopback listed for DNS and no others such as router or public DNS. The public DNS server knows nothing of your private domain.

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Answer 7 · 2020-11-10T13:34:53.933Z

BonnieWhalon-5214 answered Nov 10, '20

Thank you. It's been awhile and I forgot about the loopback.

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