distinction between users on different AP (talking to the same radius server)

Phil Mayers p.mayers at imperial.ac.uk
Tue Nov 21 11:40:30 CET 2006

liran tal wrote:
> Hey everyone,
> I was just wondering for your opinion on this issue-
> I want to spread several access points in different locations (they all 
> talk to a central radius) and then i want to distinct one location from 
> another for example user foo can login from either location but id like 
> to make the distinction from which ap he got connected from... whats the 
> best way to do that?

The radius auth and accounting packets should contain Client-IP-Address 
(which FreeRadius adds) which will differ between APs. The APs 
themselves almost certainly will put one of NAS-IP-Address or 
NAS-Identifier in the auth/acct packets, which again will allow you to 

> I was thinking of one method which is to configure in each AP a 
> different subnet mask for the DHCP allocations
> and then make the distinction based on that but I'm looking for a more 
> elegant way.

Don't do that. Use the standard Radius attributes (NAS-IP-Address, 
NAS-Identifier) or the Freeradius-supplied one (Client-IP-Address)

> Thanks guys,
> Liran.
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