pfSense

I fixed a similar sorting issue recently, IIRC it was something about setting a sorting type for the column.

The sortable library doesn't have a sorting type that can parse the duration in the format output by ndp and I didn't see a viable way to parse it out quickly. There may be a way to parse the output eventually but it's a bit tough since it is in a format of "<hours>h<minutes>m<seconds>s" and some of those values may be omitted if they are zero.

Unfortunately ndp doesn't yet support libxo either, which helped with parsing the ARP table.