server IP change

We are planning to change the IP address of our root server.
The masthead is configured with the hostname.
I want to verify if would there be an impact on the DB2 level?

If You are migrating the DB2 instance on another machine You need modify the references within DB2:
https://www.ibm.com/support/pages/db2-server-ip-address-change

then the besserver.config file to permit the Bigfix server to point to the new DB2 position.

This second step is not necessary if the DB2 is installed on the same machine and referred as ‘localhost’ or it is referred using the hostname …

If You are migrating just the Bigfix server and not DB2, not need something special to do for the database instead

In any case please have a check to the Bigfix documentation:
https://help.hcltechsw.com/bigfix/10.0/platform/Platform/Config/r_mgrt_server_linux.html