update undercloud configuration without upgrading

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I have an openstack deployment that I need to change the dhcp range but I am not sure what command to run after updating the undercloud.conf. I want to change these two parameters but I don't want to upgrade the packages or make any other changes. I want to move the 169 to like 180 and move the inspection range from 170 to 181.

dhcp_end = 10.X.X.169
inspection_iprange = 10.X.X.170,10.X.X.220

After make the change what command do I run?

I also already set this parameter a long time ago

undercloud_update_packages = false

Should I be able to just do a Openstack undercloud install again?

TD

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