You want to change IP address of the Inbound and / or Outbound interface on Symantec Messaging Gateway.
After a few moments the following message will display: (Perform the instructions noted in this message.)
The Control Center is being assigned a new IP address. This may take several minutes. The process is complete when you can access the Control Center in your browser using the new IP address. After that, log into the command line interface and restart the Control Center by typing
service controlcenter restart. If you are already connected via ssh then do not expect the message of the controlcenter restarted since the destination IP is unreachable due to the change of IP configuration. You migh ping the old and new IP to see which one is up. Then close ssh client and the browser to log in to the Control Center using the new IP address.
If the IP address of the Control Center is changed, log into each of the scanners via command-line interface.
Messaging Gateway 8.x:
agentconfig --add <IP address of new control center>
Messaging Gateway 9.x or later:
agent-config --add <IP address of new control center>
No further configuration on the SMG is required. Other devices may need to be reconfigured in your network, such as switches, routers, and/or firewalls.