How to access this attribute

[Jonathan Gazeley]

This is a simple question but I can't find the answer by searching. In 
the following rad_recv block, which variable contains the value 
"137.222.7.113"? I need to access it in unlang to determine whether the 
packet arrived at my RADIUS server from our wireless controllers, or 
from another RADIUS server.

Thanks,
Jonathan


rad_recv: Access-Request packet from host 137.222.7.113 port 53538, 
id=93, length=179
     User-Name = "@bris.ac.uk"
     Calling-Station-Id = "20:10:7a:1a:89:1d"
     Called-Station-Id = "d0:c2:82:ae:ad:00:eduroam"
     NAS-IP-Address = 172.17.107.201
     NAS-Identifier = "wism1 at bristol.ac.uk"
     Framed-MTU = 1300
     Operator-Name = "1bristol.ac.uk"