Unable to add forward map from client.db.net.db.net

[rahulvishwa81]

hi to all, I've centos 7.5 as server and centos 6.10 as client in VMware/winodws10. I am comnfiguring DDNS on server. everythng is ok except there is a problem of " centos6client.db.net.db.net" <-- why it is double "db.net" ( db.net is mine doamin name).

/var/log/messages:-
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Jan  7 19:17:12 server75 dhcpd: DHCPREQUEST for 192.168.30.10 from 00:0c:29:76:ac:8d (centos6client.db.net) via ens33
Jan  7 19:17:12 server75 dhcpd: DHCPACK on 192.168.30.10 to 00:0c:29:76:ac:8d (centos6client.db.net) via ens33
Jan  7 19:17:24 server75 dhcpd: Unable to add forward map from centos6client.db.net.db.net to 192.168.30.10: timed out

output of dhcpd -cf /etc/dhcp/dhcpd.conf :-
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[root@server75 rahul]# dhcpd -cf /etc/dhcp/dhcpd.conf 
Internet Systems Consortium DHCP Server 4.2.5
Copyright 2004-2013 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Not searching LDAP since ldap-server, ldap-port and ldap-base-dn were not specified in the config file
Wrote 1 leases to leases file.

No subnet declaration for virbr0 (192.168.122.1).
** Ignoring requests on virbr0.  If this is not what
   you want, please write a subnet declaration
   in your dhcpd.conf file for the network segment
   to which interface virbr0 is attached. **

Listening on LPF/ens33/00:0c:29:8c:f7:d2/192.168.30.0/24
Sending on   LPF/ens33/00:0c:29:8c:f7:d2/192.168.30.0/24
Sending on   Socket/fallback/fallback-net

/var/log/message: -
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Jan  7 18:27:06 server75 named[5888]: command channel listening on 127.0.0.1#953
Jan  7 18:27:06 server75 named[5888]: managed-keys-zone: journal file is out of date: removing journal file
Jan  7 18:27:06 server75 named[5888]: managed-keys-zone: loaded serial 3
Jan  7 18:27:06 server75 named[5888]: zone 0.in-addr.arpa/IN: loaded serial 0
Jan  7 18:27:06 server75 named[5888]: zone 1.0.0.127.in-addr.arpa/IN: loaded serial 0
Jan  7 18:27:06 server75 named[5888]: zone 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa/IN: loaded serial 0
Jan  7 18:27:06 server75 named[5888]: zone db.net/IN: loaded serial 2019120906
Jan  7 18:27:06 server75 named[5888]: zone localhost.localdomain/IN: loaded serial 0
Jan  7 18:27:06 server75 named[5888]: zone localhost/IN: loaded serial 0
Jan  7 18:27:06 server75 named[5888]: zone 60.168.192.in-addr.arpa/IN: loaded serial 2019120906
Jan  7 18:27:06 server75 named[5888]: all zones loaded
Jan  7 18:27:06 server75 named[5888]: running
Jan  7 18:27:06 server75 named[5888]: zone db.net/IN: sending notifies (serial 2019120906)
Jan  7 18:27:06 server75 named[5888]: zone 60.168.192.in-addr.arpa/IN: sending notifies (serial 2019120906)
Jan  7 18:27:06 server75 systemd: Started Berkeley Internet Name Domain (DNS).
Jan  7 18:27:08 server75 dhcpd: DHCPDISCOVER from 00:0c:29:76:ac:8d via ens33
Jan  7 18:27:09 server75 dhcpd: DHCPOFFER on 192.168.30.10 to 00:0c:29:76:ac:8d (centos6client.db.net) via ens33
Jan  7 18:27:09 server75 dhcpd: DHCPREQUEST for 192.168.30.10 (192.168.30.1) from 00:0c:29:76:ac:8d (centos6client.db.net) via ens33
Jan  7 18:27:09 server75 dhcpd: DHCPACK on 192.168.30.10 to 00:0c:29:76:ac:8d (centos6client.db.net) via ens33
Jan  7 18:27:14 server75 dhcpd: DHCPREQUEST for 192.168.30.10 from 00:0c:29:76:ac:8d (centos6client.db.net) via ens33
Jan  7 18:27:14 server75 dhcpd: DHCPACK on 192.168.30.10 to 00:0c:29:76:ac:8d (centos6client.db.net) via ens33
Jan  7 18:27:26 server75 dhcpd: Unable to add forward map from centos6client.db.net.db.net to 192.168.30.10: timed out

[TrevorH]

7.5 is 2 years out of date. Run yum update to get up to date on 7.7

Have you set up the necessary keys etc to allow nsupdate to work with your DNS server? Have you told dhcpd about the keys?