Hi Marvin, Thank you very much for the quick & easy method to change the FTD IP. I have a quick query.
Our FTD registered on FMC via hostname (FQDN), in this case, is it sufficient to change the IP address on host record in DNS server and change the IP on FTD without touching the FMC? would FMC detects the new IP with the FQDN? or do I need to follow the above procedure?
If you initially registered the FTD using FQDN, then you should be able to change the IP in the DNS host record without losing connectivity. You should only have a problem if the FTD can't resolve the name. I would first test that the FTD can ping the current FQDN just to make sure it's still seeing the FMC by name before changing the record.
One last update.
If you need to change the management IP address from the FMC, but you dont want to lose the configuration on the FTD you need to visit the FMC and go to the FTD device page and disable management of it. Then go to the FTD device and change your IP address. Then go back to the FMC on the same FTD device page you want to change the management IP then enable the management.
Rodrigo nailed it. This is the answer to the OP's question.
1) From FMC, click Devices > Device Management, and edit the FTD
2) Go to Device tab under that device in "Management" section (as in Rodrigo's screenshot) and switch the toggle to "Disable Management"
Delete the manager from the FTD: configure manager delete
Remove the device from FMC: Devices > Device Management
Change the IPs of the FTD:
configure network ipv4 manual 10.34.45.64 255.255.255.248 10.34.45.1
Add the manager back on FTD: configure manager add 10.2.9.288 password
Add the FTD to the FMC and reapply the configuration: Devices > Device Management