If you need to assign a new IP address to the server(s) hosting OracleAS (for example, when moving the server(s) to another network segment), there are a few things to keep in mind:

* Read the Oracle Application Server 10g Online Documentation(http://download.oracle.com/docs/cd/B14099_19/core.1012/b13995/host.htm)
* If you're running OracleAS version 10.1.2.3 on Linux, then apply patch 7000666(http://updates.oracle.com/download/7000666.html) to the Oracle homes you are going to reconfigure (e.g. Middle-Tier and Infrastructure)
* Disable automatic restart of processes, in case you need to restart the OS
* If the Infrastructure and Middle-Tier are hosted on separate servers, you first reconfigure the Middle-Tier and then the Infrastructure
* If the Infrastructure and Middle-Tier are hosted on the same server, you need to reconfigure the Infrastructure before you reconfigure the Middle-Tier
* The database does not need any reconfiguring[@more@]In short, these are the steps to reconfigure an OracleAS home:

1. If it's an Infrastructure home, then shut down all associated Middle-Tier homes
2. If it's a Middle-Tier home, then ensure that the associated OID is running
3. Set environment variable ORACLE_HOME
4. Shut down all processes
5. Change IP Address
6. If it's an Infrastructure home, then start OID
7. Set parameter java.util.logging.ConsoleHandler.level to CONFIG in file $ORACLE_HOME/chgip/config/chgip.log.properties
8. Run $ORACLE_HOME/chgip/scripts/chgiphost.sh with either "-infra", "-idm", or "-mid" as parameter, depending on installation type
9. Check log: $ORACLE_HOME/chgip/log/chgip0.log

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