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Old 04-24-2006, 09:56 AM   #1
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Registered: Feb 2004
Posts: 1

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problem with dynamical DNS updates

Hi all and thanks a lot for your patience....I apologize for my bad english.

I've this big problem, I haven't before.

I've configured my FC3 server to run DNS and DHCP simultaneously, giving an "UPDATE_KEY" that permit to DHCPD to overwrite NAMED zone files.

All worked fine until few days ago.

Now, as I can see from log files, DHCP give addresses to my clients and
write on log file that named zone files have been updated...but isn't true!!!

Cleaing, addresses and all other right informations are passed to my clients, but no record has been added to zone files...

The last updates I make on my system regard DHCPD, NAMED and kernel, but I made this using Fedora Update Manager....Is that a possible reason for this problem???

Thanks for your help!!!


....what about my english???
Old 04-25-2006, 07:36 PM   #2
Registered: Nov 2001
Location: London, UK
Distribution: Fedora
Posts: 161

Rep: Reputation: 43
English OK, problem more difficult!

DHCP/DNS breaks VERY easily - it relies on TXT records: DHCP keeps a copy of the TXT keys it sets and DNS has the TXT records in the zone file. If they get out-of-step, DNS refuses to update.

Maybe the Fedora update wrote a new, empty /var/lib/dhcp/dhcpd.leases or moved the file to /var/lib/dhcpd?

If they are out-of-step, stop the named service (to update the zone files from the journal files) and edit the forward and revers zone files to remove all of the old DHCP A, PTR and TXT records. Stop the dhcpd service and empty the leases file (rename it and create a new one). Start both services again and test to see what happens. If you use DNS replication, remember to increment the SOA serial numbers.


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