TTL when updating via DDNS

[Glenn Satchell]

>Date: Wed, 09 Jul 2008 15:55:44 +0200
>From: Marc Muehlfeld <Marc.Muehlfeld at medizinische-genetik.de>
>To: dhcp-users at isc.org
>Subject: Re: TTL when updating via DDNS
>
>Glenn Satchell schrieb:
>> If you have hosts being deleted from the zone file then you have a
>> different problem. Are your clients successfully renewing their leases?
>> Are there any log messages indicating that dhcpd asked for the zone
>> entry to be deleted? Is there anything related to this inthe (I assume)
>> bind  logs?
>
>dhcpd.log (without any other messages of this computer before and after):
>Jul  9 13:19:21 nucleus dhcpd: delete 179.0.1.10.in-addr.arpa. IN PTR: success.
>Jul  9 13:19:21 nucleus dhcpd: delete proben-05.clt.mr.lfmg.de IN A 
>10.1.0.179: success.
>
>
>This are the named log entries that appear at the same time:
>09-Jul-2008 13:19:21.000 update: info: client 192.168.29.2#33018: updating 
>zone '0.1.10.in-addr.arpa/IN': deleting rrset at '179.0.1.10.in-addr.arpa' PTR
>09-Jul-2008 13:19:21.049 update: info: client 192.168.29.2#33018: updating 
>zone 'clt.mr.lfmg.de/IN': deleting an RR
>

Are these clients mentioned above able to ping the dhcp server? This is
required as the dhcp renewal messages are sent directly to the dhcp
server rather than using the dhcp relays.

Can you post the 192.168.29.0 subnet definition? Does the same
behaviour apply for hosts with static and dynamic addresses?

regards,
-glenn
>
>
>> Can you please post your dhcpd config file (or a reasonable example if
>> it is huge).
>
>This are just the global options and one subnet declaration of my dhcpd.conf:
>
>
>
>ignore client-updates;
>ddns-update-style ad-hoc;
>update-static-leases true;
>ddns-domainname "mydomain.tld";
>
>key DHCP_UPDATER  { algorithm HMAC-MD5.SIG-ALG.REG.INT; secret ............; };
>
>zone mydomain.tld  .            { primary 192.168.29.2; key DHCP_UPDATER; }
>zone 0.1.10.in-addr.arpa.       { primary 192.168.29.2; key DHCP_UPDATER; }
>
>authoritative;
>
>one-lease-per-client true;
>
>log-facility local7;
>
># Default lease time is 5 days
>default-lease-time 432000;
>
># Maximum lease time is 6 days
>max-lease-time 518400;
>
>option domain-name-servers 192.168.29.2, 192.168.29.4;
>option netbios-name-servers 192.168.29.4;
>
>
>subnet 10.1.0.0 netmask 255.255.255.0 {
>
>         option domain-name "mydomain.tld";
>         option broadcast-address 10.1.0.255;
>         option routers 10.1.0.5;
>
>         # IT-Hosts with fix IPs via DHCP (10.1.0.240/28)
>         pool {
>                 range 10.1.0.241
>                 deny unknown-clients;
>                 host it-01 { hardware ethernet 00:18:F3:08:B0:42; 
>fixed-address 10.1.0.254; }
>         }
>
>         # Printer with fix IPs via DHCP (10.1.0.16/28)
>         pool {
>                 range 10.1.0.17;
>                 deny unknown-clients;
>                 host ZETLP2844-9  { hardware ethernet 00:17:9A:AE:38:F0; 
>fixed-address 10.1.0.25; }
>         }
>
>         # All other DHCP clients
>         pool {
>                 range 10.1.0.100 10.1.0.200;
>         }
>
>}
>
>
>