stuck up record in DNS
ivan nepryakhin
nepryakhin.1989 at gmail.com
Thu Aug 22 14:25:34 UTC 2019
hi guys!
I'm encountered with a strange issue:
- host with the name host12-c12-1 one time requested and get the
address 10.10.10.12
- dhcpd correct doing records ( A and PTR ) in DNS
- BUT after host shutdown and in the file dhcpd.leases line "binding
state" become in the "free" - records A and PTR staying stuck in the base
of DNS.
from https://linux.die.net/man/5/dhcpd.conf#Dynamic%20Dns%20Updates
i thinking what DHCP- DDNS work in the next scheme:
- HOST doing request for ip address
- DHCP getting request and try write RR's A and PTR in DNS
- DHCP give out ip address and do a record in the file dhcpd.leases
- when time lease expire DHCP remove RR's A and PTR from DNS
Please give me vector for a searching or suggestion about mistakes.
Thanks!!
P.S unfortunately i can't upgrade my environment
Environment:
isc-dhcp42-server-4.2.6_1
bind-base-9.9.5_8
cuted of the file dhcpd.lease:
lease 10.10.10.12 {
starts 5 2019/08/09 11:00:47;
ends 5 2019/08/09 12:00:47;
tstp 5 2019/08/09 12:00:47;
cltt 5 2019/08/09 11:00:47;
binding state free;
hardware ethernet 18:10:2b:12:db:12;
uid "\001\010\000'\216G\220";
}
cuted from the file /etc/named/tsc/tsc.zone:
$TTL 1800 ; 30 minutes
host12-c12-1 A 10.10.10.12
TXT "00ffa9c88e143752544ac44exxxxxxxxxx"
cuted of the file dhcpd.conf:
## DDNS related configuration
ddns-update-style interim;
ddns-rev-domainname "in-addr.arpa.";
ddns-domainname "tsc.";
update-static-leases on;
group {
option routers 10.10.10.1;
ddns-hostname = host-decl-name;
update-optimization false;
update-conflict-detection false;
# example host
host host12 {
hardware ethernet 18:31:BF:xx:xx:xx;
fixed-address 10.10.10.111;
}
}
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