> how is telnet via ipv6 supposed to work?
> nc# telnet 2000:0:0:1234::9
> 2000:0:0:1234::9: Unknown host

Are you by any chance using the domestic telnet?  ;-) Only the
international one does ipv6.

Another thing to stub out some logic is tcpwrappers.  You need to
short-circuit any "ALL: unknown paranoid" lines you may have in
hosts.allow.  For example this will do the trick for fingerd:
	
	# for ipv6, which confuses poor tcpd/tcpwrappers
	fingerd:0.0.0.0:allow 

	$ telnet capsicum.ipv6.wsrcc.com finger
	wolfgang
	<cr>
	[tons of finger output snipped]

-wolfgang
-- 
       Wolfgang Rupprecht <wolfgang+gnus@dailyplanet.wsrcc.com>
		    http://www.wsrcc.com/wolfgang/
DGPS signals via the Internet  http://www.wsrcc.com/wolfgang/gps/dgps-ip.html