For a rebuilt master server, the IP address is not critical. The name must match on a rebuilt server.
Now, if you actually want some help, you will need to provide some more information. Such as
I hope this helps
Hello @thamogovender ,
be more descriptive in the subject name. "NetBackup" is not very specific description of a problem on a forum which is dealing with NetBackup. Best to introduce exact error message which you are getting - "cannot access media server catalogs" is also very generic description of your problem. You even did not specify which type of disk you use for catalog backups.
If your catalog backups are on a MSDP try to follow this first: https://www.veritas.com/support/en_US/article.100049485.
Also refer to Disaster Recovery chapter here - https://www.veritas.com/content/support/en_US/doc/15179611-151832780-0/v95648490-151832780.