Proper way to perform the dhcp release/renew via script?

GPz1100

The webui has function under Status/Interfaces/WAN to release WAN and perform renew.

What is the command line equivalent of this to use in script?

/etc/rc.d/dhclient forcerestart igb0

/etc/rc.linkup stop igb0
/etc/rc.linkup start igb0

I notice ipv6 does not restart properly with dhclient forcerestart.

To bypass my isp's (att) gateway box, I'm using wpa_supplicant to handle 802.1x eapol auth. This runs at boot and appears to be generally stable.

With my old firewall I had a cron task that ran every 10 minutes to verify connectivity and kill/restart the wpa_supplicant if it was unresponsive. Part of the script was to initiate a dhcp renew once eapol authorized successfully.

stephenw10

It does this:

if ($_POST['ifdescr'] && $_POST['submit']) {
	$interface = $_POST['ifdescr'];
	if ($_POST['status'] == "up") {
		if ($_POST['relinquish_lease']) {
			dhcp_relinquish_lease($_POST['if'], $_POST['ifdescr'], $_POST['ipv']);
		}
		interface_bring_down($interface);
		restart_interface_services($interface);
		filter_configure();
		system_routing_configure();
		send_event("service reload packages");
	} else {
		interface_configure($interface);
	}
	header("Location: status_interfaces.php");
	exit;
}

So you could just include those php functions in your script.

I would probably try rc.linkup stop and start as you showed though. That will likely run a bunch of other things but if it doesn't cause an issue I'd go with it.

GPz1100

@stephenw10 The original script is in bash, but is fairly simple so should be easily adaptable to tcsh.

I know lots of other folks with similar configurations don't even bother with a watchdog script for wpa_supplicant. This is fine if it works. I rather have something in there that ensures there's network connectivity and the supplicant is not stalled.