You can check the below note id's for changing the hostname
11i: How to change the hostname and/or port of the Database Tier using AutoConfig (Doc ID 338003.1)
11i: How To Change the Hostname of an Applications Tier using AutoConfig (Doc ID 341322.1)
Preparing For Changing the IP Address, Hostname or Domain Of Oracle Database Servers (Doc ID 363609.1)
How To Change the Hostname In E-Business Suite R12.2.x? (Doc ID 1963018.1)
For R12.2 there is no specific docs available, database node steps still same for application you have to go with adcfgclone.pl
Right now we are testing on Our instance is 11i 188.8.131.52 with datbase 9i and RHEL4.
Which of the above docs is for EBS 11i?
The two 11i Notes has mentioned steps specific to Application Tier and Database Tier separately
You can choose accordingly if you have different Application and DB Tier nodes
Hope it helps
Thanks Jibu and Shaik,
I will check the note....brb