Basically redo https://github.com/oxidecomputer/console/pull/2897/commits/b21f0b159b89d55f88be3715b627a2473b1f56a1 when https://github.com/oxidecomputer/omicron/issues/8761 is in. Also make sure adding IPv6 ranges works.
Basically redo b21f0b1 when oxidecomputer/omicron#8761 is in. Also make sure adding IPv6 ranges works.