Reply with group attribute

[Markus Wernig]

Hello all

I'm terribly new to RADIUS, so please excuse my ignorance.

What I'm looking for (and can't find in neither man nor wiki nor google) 
is how to send back the group an authenticated user is in together with 
the authentication result.

I have a VPN gateway that authenticates users against freeradius, using 
the unix authentication scheme (the users are all real unix users on the 
freeradius server). All ok, works a charme. Now we have the requirement 
to apply different security settings to different user groups. The user 
groups are the unix groups the different users are in on the freeradius 
server. So I need the radius server to return the user's group 
information together with the Access-Accept.
I'm sorry but for the life of me I can't find any information on how 
this is done.

Could somebody please point me to the right direction?

Thanks /markus