dns - dhcp fixed address problem

[rblenis@…]

if I add a dhcp fixed ip address for a client, then latter remove the fixed mapping so that the client will get a dynamic address, dns still returns the fixed address, even after rebooting ebox and client. this is with ebox 1.4 (DHCP module 1.4.1-0ubuntu1~ppa1~hardy1, DNS module 1.4-0ubuntu1~ppa1~hardy1).

[effgee]

I think I encountered the same problem here:

 http://forum.zentyal.org/index.php?topic=5012.msg20526#msg20526

My solution which isn't good one is to remove the previous configs from bind and ebox-dns and start from scratch..

[jsoriano@…]

Hi,

I think that the current behaviour is the correct one. The DNS daemon maintains a database for dynamic domains, when a host with a fixed address claims its IP throught DHCP, the database is updated. The entries in this database are removed after some time, so if you remove the fixed address, after some time the DNS server won't resolve it. It's also updated if the DHCP server is configured to assign the fixed address to a different host after this host requests it.

The only solution would be to remove this cache and restart the module, but then all the hosts whose dynamic domains are assigned throught DHCP would need to request their addresses again.

To remove the cache and restart the module you can do:

sudo rm /var/lib/bind/db.<domain>*
sudo /etc/init.d/ebox dns restart

Thanks for reporting.