Comparison between different access servers / captive portals

	StockholmOpen/Oasis	NoCat	NetLogon
License	BSD	GNU GPL	GNU GPL
Multiple upstream support	Yes	No	No
Client software needed	No	No	No
Authentication type	any, through PAM	local passwd file, MySQL DB	SSH/POP3/IMAP/NIS
Supported platforms	Linux/(FreeBSD)	UN*X	Linux
Access verification	IP/MAC filtering	IP/MAC filtering	IP filtering
Disconnection detection	ARP/ICMP ping, plugin or traffic monitoring	timeout	ARP ping, SNMP to switch
IP address type(s)	public/private	public/private	public/private