V4.2.1 dont delete DNS entry on DHCPRELEASE

[Jean-Michel Repond]

Since V4.2.1, DHCP doesn't delete immediatly the entry on DNS server
when the client release his address.

It works well from V3.0.5 to V4.2.0-P2, but since V4.2.1 (and also
V4.2.1-P1) the server don't delete the DNS entry!

See the log on V4.2.0-P2:
May 30 14:04:47 zone92 dhcpd: [ID 702911 local7.info] DHCPDISCOVER from
00:17:42:13:c5:05 via 10.174.232.11
May 30 14:04:48 zone92 dhcpd: [ID 702911 local7.info] DHCPOFFER on
10.174.232.229 to 00:17:42:13:c5:05 (POLT007) via 10.174.232.11
May 30 14:04:48 zone92 dhcpd: [ID 702911 local7.info] DHCPREQUEST for
10.174.232.229 (10.174.228.92) from 00:17:42:13:c5:05 (POLT007) via
10.174.232.11
May 30 14:04:48 zone92 dhcpd: [ID 702911 local7.info] DHCPACK on
10.174.232.229 to 00:17:42:13:c5:05 (POLT007) via 10.174.232.11
May 30 14:04:49 zone92 dhcpd: [ID 702911 local7.info] DHCPREQUEST for
10.174.232.229 (10.174.228.92) from 00:17:42:13:c5:05 (POLT007) via
10.174.232.12
May 30 14:04:49 zone92 dhcpd: [ID 702911 local7.info] DHCPACK on
10.174.232.229 to 00:17:42:13:c5:05 (POLT007) via 10.174.232.12
May 30 14:04:49 zone92 dhcpd: [ID 702911 local7.info] Added new forward
map from lifebook.dyn-pp.bger.admin.ch. to 10.174.232.229
May 30 14:04:49 zone92 dhcpd: [ID 702911 local7.info] Added reverse map
from 229.232.174.10.in-addr.arpa. to lifebook.dyn-pp.bger.admin.ch.
.
.
May 30 14:05:02 zone92 dhcpd: [ID 702911 local7.info] DHCPRELEASE of
10.174.232.229 from 00:17:42:13:c5:05 (POLT007) via nxge3 (found)
May 30 14:05:02 zone92 dhcpd: [ID 702911 local7.info] Removed forward
map from lifebook.dyn-pp.bger.admin.ch. to 10.174.232.229
May 30 14:05:02 zone92 dhcpd: [ID 702911 local7.info] Removed reverse
map on 229.232.174.10.in-addr.arpa.


And on V4.2.1-P1:
May 30 13:46:19 zone88 dhcpd: [ID 702911 local7.info] DHCPDISCOVER from
00:17:42:13:c5:05 via 10.174.232.11
May 30 13:46:20 zone88 dhcpd: [ID 702911 local7.info] DHCPOFFER on
10.174.232.229 to 00:17:42:13:c5:05 (POLT007) via 10.174.232.11
May 30 13:46:20 zone88 dhcpd: [ID 702911 local7.info] DHCPREQUEST for
10.174.232.229 (10.174.228.88) from 00:17:42:13:c5:05 (POLT007) via
10.174.232.11
May 30 13:46:20 zone88 dhcpd: [ID 702911 local7.info] DHCPACK on
10.174.232.229 to 00:17:42:13:c5:05 (POLT007) via 10.174.232.11
May 30 13:46:20 zone88 dhcpd: [ID 702911 local7.info] DHCPREQUEST for
10.174.232.229 (10.174.228.88) from 00:17:42:13:c5:05 (POLT007) via
10.174.232.12
May 30 13:46:20 zone88 dhcpd: [ID 702911 local7.info] DHCPACK on
10.174.232.229 to 00:17:42:13:c5:05 (POLT007) via 10.174.232.12
May 30 13:46:20 zone88 dhcpd: [ID 702911 local7.info] Added new forward
map from lifebook.dyn-pp.bger.admin.ch. to 10.174.232.229
May 30 13:46:20 zone88 dhcpd: [ID 702911 local7.info] Added reverse map
from 229.232.174.10.in-addr.arpa. to lifebook.dyn-pp.bger.admin.ch.
.
.
May 30 13:46:31 zone88 dhcpd: [ID 702911 local7.info] DHCPRELEASE of
10.174.232.229 from 00:17:42:13:c5:05 (POLT007) via nxge0 (found)

As you can see the DHCP server doesn't remove the DNS entry.

Any idea about this change?

Thanks in advance

J-M Repond