Currently there is no facility in dhclient(8) to issue RELEASE messages. I had no recollection of adding such a thing, and a quick
confirmed there is no DHCPRELEASE related code.
Ergh. OK thanks, that's super annoying that it's not there.
Which signal(s) are used elsewhere to trigger RELEASE? Goggle is not coughing up an obvious answer. :-)
It varies, IIRC on at least on other linux or bsd distro sending HUP took a more literal approach ("hang up and leave") and sent a DHCP release before nuking its lease cache, and I'm pretty sure somewhere else you could send "SIGUSR2" or something.
