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Resolve DNS problem

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On the server hosting PRTG monitoring tool (lets call it SERVER1) , the DNS servers were not set.

On the network I am monitoring, i have COMPUTERNAME1(192.168.1.2) and COMPUTERNAME2(192.168.1.3) which are both connected to Internet via the Cisco router that is being monitored.

On the TopLists of my custom Netflow v9 sensor, i am listing the Destination IP.

In my TopList, the local computers are displayed properly : COMPUTERNAME1(192.168.1.2) COMPUTERNAME2(192.168.1.3)

But the websites being visited are displayed without their DNS names :

[209.191.122.70] [209.191.122.71]

Which is logical since the DNS servers are not setup on the server.

But then I decided to setup thos DNS : 202.106.46.151 and 202.106.195.68

Now, the local computers are displayed like this : SERVER1(192.168.1.2) SERVER1(192.168.1.3)

But the websites visited are now displayed correctly : www.yahoo.com(209.191.122.70) www.yahoo.com(209.191.122.71)

Why can't I see the names of my local computers anymore ?

Thanks for the help

dns dns-resolution ip

Created on Feb 10, 2012 3:19:49 AM by  guigui42 (0) 1



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Hello,
as you have provided DNS servers explicit, now these servers are used and therefore your internal computernames cannot be resolved.
If you have only this two machines, the most easy solution would be adding them to the hosts file of the machine to make PRTG resolve them correct.
Best regards

Created on Feb 10, 2012 1:47:07 PM by  Konstantin Wolff [Paessler Support]

Last change on Feb 10, 2012 1:47:26 PM by  Konstantin Wolff [Paessler Support]



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Thanks for your answer. Unfortunately, we have about 100 computers, so this solution is not suitable.

Any other solution ?

Thanks

Created on Feb 14, 2012 7:18:40 AM by  guigui42 (0) 1



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Sorry, no. Apart from of course removing the DNS-Server settings again on the PRTG Host.

Created on Feb 14, 2012 2:16:02 PM by  Torsten Lindner [Paessler Support]



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If you configure your internal DNS Servers to perform forwarding of queries they're not authoritative for, they should be able to resolve both external and internal addresses.
This is not related to PRTG's configuration.

Created on Jun 2, 2015 7:14:04 AM by  Luciano Lingnau [Paessler Support]



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Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.