"Reject Leases From" doesn't seem to be working.

[DerfM]

In the WAN DHCP Settings, there is a setting for "Reject Leases From" described as "If there are certain upstream DHCP servers that should be ignored, place the comma separated list of IP addresses of the DHCP servers to be ignored here. This is useful for rejecting leases from cable modems that offer private IPs when they lose upstream sync."

I have added the IP of my cable modem (Coda 57) "192.168.100.1" to this field.

When my cable carrier drops, my opnSense WAN interface still gets a 192.168.100.xx IP address and doesn't let it go until next DHCP refresh. Today they did some work in my neighborhood and everything went down at 9am and I ran home at lunch to get it back up by simply reloading the interface.

It seems the above setting is meant specifically for this issue, but is not working properly. Has anyone else run into this, have a way to fix it, or any suggestions?

opnSense has been fully updated, and the issue has remained for the year I've had this new provider and this modem.