Aruba AP and Option 43 on ISC DHCP

I wanted a slightly more independent DHCP server in my lab so I went looking for options. I ended up landing on CentOS 7 / Webmin / ISC DHCP rather than using my existing Windows Server setup (I wanted to be able to blow away that machine and not take down all addressing) or pfSense (can’t be a server and relay, and I need to send those packets to ClearPass).

New DHCP server means new learning opportunity, right? First opportunity: configuring option 43 to support an Aruba AP. Snippet from the dhcpd.conf is below.

subnet 192.168.200.0 netmask 255.255.255.0 {
	option domain-name "network.lab";
	option routers 192.168.200.1;
	option ntp-servers 192.168.200.1;
	option domain-name-servers 192.168.200.10;
	# Aruba - Normal Campus AP
	subclass "vendor-class" "ArubaAP" {
		option vendor-class-identifier "ArubaAP";
		option vendor-encapsulated-options "192.168.200.20";
		}
	# Aruba - Unified AP
	subclass "vendor-class" "ArubaInstantAP" {
		option vendor-class-identifier "ArubaAP";
		option vendor-encapsulated-options "192.168.200.20";
		}
	range 192.168.200.41 192.168.200.254;
	}