Reverse DNS Lookup 0.0.0.0

[ess07]

Hello Everyone,

I have been suffering with this for a little while now. Seems we are having some random issues with dns lookup popping up. I am not entirely sure if this has to do with virtual host on these some of these servers or not. The following is a small piece from our reports.

drvc4n1:/devices (pid 7479): Reverse DNS lookup failed for address 0.0.0.0
drvc4n1: /devices level=full, 189 KB 00:03:15 882 files

drvc4n2:/var (pid 21850): Reverse DNS lookup failed for address 0.0.0.0
drvc4n2: /var level=full, 1636 MB 00:10:34 55233 files


Seems to me that the system actually does backup but the reports are getting crammed with these dns failures.
Can anyone give me some suggestions on what could maybe fix this.Btw we are using networker 7.3.2. We backup a mixture of unix,linex,and windows machines.

Thanks in advance.

 

[Rif123]

Hi,

Have you tried to use hosts-files instead to see if you get rid of the messages?

One guess would be that the not all hosts are set up in the reverse lookup zone in the DNS, but that is just a longshot.

 

[ess07]

Thanks for the response.
But yes actually we are using the hosts file now.
We were having all sorts of issue without it.
This error actually is coming up even with using the hosts file.
I thought that the hosts file bypasses the dns lookup.

 

[GunnarD]

That depends on whats is on hosts row i /etc/nsswitch.conf

If the row is something like this

hosts: dns files

Then dns is used first, then hosts file.

 

[ess07]

thanks for that bit of info. i didnt actually know that. But yes it does state:
hosts: files dns

 

[Rif123]

Hi,

I've not seen this before and using hosts-files usually clear things up. So, yet another long shot, but on the backup server, is there a line in the hosts-file for the server itself and all its IP addresses? The same on your clients?

 

[denisfr]

Yes, I join Rif123 :

Networker needs to have ANY network interface resolved :
- either by naming service (e.g : dns)
- either by host file (/etc/hosts on unix)

for both client and server.

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