Locking realm access to a specific huntgroup

[Jonathan De Graeve]

Hello, 

I have different NAS and each type of NAS is grouped together in a
huntgroup.

I need to make an addition to my radius setup to proxy requests with a
certain realm to a specified server.

Proxying is already working but I want to lock the users using that
specific realm to a specific huntgroup so that its only possible for
them to login on predefined NASgroup.

I don't have access to the remote proxy server. Using attr_filter isn't
an option since this only filters replys.

Anyone knows how to do this?

Thx in advance and kind regards,

Jonathan