Re: [BackupPC-users] DNS problem Can someone explain

On Mon, Dec 19, 2011 at 11:10 AM, Michael Conner <mdc1952 AT gmail DOT com> 
wrote:
> I run backuppc on about 15 computers and one networked Buffalo drive in a 
> small museum. I've had it working well for about a year on an old computer 
> running Centos 5.6 despite not knowing a great deal about Linux and 
> networking, just the IT guy by default. The clients are mostly Windows XP, 
> some Vista and Windows 7; also an iMac and a Centos web server. I've got 
> DeltaCopy running on most of the Windows computers and use rsyncd; other 
> windows use smb.
>
> Last week I had occasion to change the DNS servers used by our router from 
> those hosted by the network that controls our T1 line to OpenDNS when 
> exploring a problem unrelated to backuppc. However, after making the change, 
> I saw that a lot of the backups were failing due to slow ping times. When I 
> increased the ping wait, they failed with messages like: Error connecting to 
> rsync daemon at educationoffice:873: inet connect: Connection timed out. The 
> xfer log on the Buffalo said: timeout connecting to 67.215.65.132:445, which 
> is related to a OpenDNS.The linux and mac clients had no problems; they use 
> rsync for xfer method. The one Windows 7 machine, which uses smb, also 
> worked. Pings and nmblookups run from the command line in Mac OS 10.6.8 also 
> were fine.
>
> I changed the DNS servers back and everything is normal again.
>
> Can someone explain what was going on just for my edification?

That looks like you forgot to include your own domain in a 'search'
directive in your resolv.conf file when you changed nameservers.  Or
you were using a local dns server that handles an unregistered/private
domain and switched to something that only knows registered domains.

-- 
  Les Mikesell
    lesmikesell AT gmail DOT com

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