inexplicable Nas Not Found

[Tobias Hachmer]

Try configure your NAS to set the correct IP address in the 
access-request packet for the NAS-IP-Address Attribute.
This is from your debug output:

rad_recv: Access-Request packet from host 20.20.20.17 port 55281,
id=56, length=67
	User-Name = "northpole"
	User-Password = "1234"
	NAS-IP-Address = 127.0.1.1
	NAS-Port = 1812
	Framed-Protocol = PPP

It seems that your script parses only for the NAS-IP-Address Attribute 
to identify the NAS and not the source address of the packet itself.
Well, just a workaround, you might better fix your script.

Regards, Tobias Hachmer