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?
Mike
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