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NAT with cable modems - dynamic IP

I am wondering how OpenBSD works with a cable modem installation running
dynamic IP. The latest entry into the cable modem field in Australia
will be using dynamic IP with an as yet unknown lease time.
If I install an OpenBSD machine as a firewall how does it handle a
changed address from the cable modem side? Will I have to reload ipnat
or reboot the computer if the address changes, or can it detect the
changed address and continue working?