Blank usernames

[Marat Rysbekov]

Good day, everyone.

I'm trying to setup FreeRadius 1.1.3 to assing IP-addresses based on
what NAS the authorization request came from, no matter what
username or password was supplied.

Some of my configuration:

<huntgroups>
...
Alpha          NAS-IP-Address == 192.168.10.1

Beta            NAS-IP-Address == 192.168.20.1
...

<users>
...
DEFAULT    Auth-Type := Accept, Huntgroup-Name == "Alpha", Pool-Name := "PoolA"

DEFAULT    Auth-Type := Accept, Huntgroup-Name == "Beta", Pool-Name := "PoolB"
...

I specify the IP-pools in <radiusd.conf>, and it works fine, except
for one thing:
I get no Access-Accept reply whenever the username is left blank (any non-empty
username is accepted by the server).

So, my question: is there a way to make FreeRadius use the DEFAULT entries
when the username is not supplied at all?

Thanks.