stuck up record in DNS

Nepryakhin Ivan nepryakhin at
Sun Aug 11 14:40:47 UTC 2019

hi guys!

I'm encountered with a strange issue:

  - host with  the name host12-c12-1 one time requested and  get the  
  - 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.

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.


P.S unfortunately i can't upgrade my environment



cuted of the file

lease {
   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/

$TTL 1800       ; 30 minutes
host12-c12-1    A
                         TXT "00ffa9c88e143752544ac44exxxxxxxxxx"

cuted of the file dhcpd.conf:

## DDNS related configuration

ddns-update-style interim;
ddns-rev-domainname "";
ddns-domainname "tsc.";
update-static-leases on;

group {

         option routers;
         ddns-hostname = host-decl-name;

         update-optimization false;
         update-conflict-detection false;

# example host
             host host12 {
                 hardware ethernet 18:31:BF:xx:xx:xx;


Best regards,
*Nepryakhin Ivan Sergeevich*
system administrator
STC Group
		T: +7 (812) 325-88-48, ext 6225
М: +7 (911) 291-81-68
nepryakhin at <mailto:nepryakhin at> <>

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