With the default settings, a duplicate A record gets registered by DHCP with the client’s new IP.
The DDNS standards allow a further method based on an asymmetric cipher called SIG(0).
ISC DHCP does not (as of v4.x) support SIG(0) and it is not discussed further.
To create that file we need put in a flat text file 2 or 3 values: 105 test Host06.testenv.local 220.127.116.11 test Host07.testenv.local 18.104.22.168 test Host08.testenv.local 22.214.171.124 test Host09.testenv.local 126.96.36.199 test Host10.testenv.local 3.168.192.
So, now we can create a script to automatically create many DNS records.
Since there are situations where an IP address can change, it helps to have a way of automatically updating hostnames that point to the new address every time.
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If the TCP/IP settings for a member computer specify the IP address of a public DNS server—perhaps at an ISP or DNS vendor or the company’s public-facing name server—the TCP/IP resolver won’t find Service Locator (SRV) records that advertise domain controller services, LDAP, Kerberos and Global Catalog.
This article explains how to setup the automatic PTR records.
By default, statically configured clients and remote access clients that do not rely on the DHCP server for DNS registration, will re-register their A & PTR records dynamically and periodically every 24 hours.