Logging UDP port

[Jonathan Gazeley]

We've got several RADIUS clients behind a NAT, so we can't distinguish 
them by source IP. We do not control those NAS (or the NAT) so we can't 
insert arbitrary attributes, either.

Is there a way radiusd can log the UDP port on which a packet entered a 
virtual server? I think this might be our only way of distinguishing 
these clients.

Thanks,
Jonathan