How to disable DNS updates on LINUX server?

[nsvora]

Hi All,
I am working on Dynamic DNS client implementation. I have the following
scenario:
1) The target under test gets the IP Address from the DHCP server.
2) After getting the IP Address, my DDNS client would send the update
request to the DDNS server directly.

But currently, DHCP server is sending the update to the DNS server
directly.
Any idea of how to disable DHCP sending DDNS updates ?

With Regards,
Nirav