I have the following setup:
CoovaChilli accepts user login requests and sends radius packets to freeradius
freeradius then proxies the requests (based on realm) onto a second freeradius server.

If I attempt a login with username "A\" The first freeradius server recieves packets with UserName atribute = "A\\" and sends a packet to the sencond radius server with username attribute = "A\\\\"  (as reported by wireshark)

So it looks like freeradius is not correctly unescaping the username attribute.  (Or incorrectly re-escaping) before the proxy.

How is freeradius expected to behave when escaping backslash and quote characters before proxying?  And is it possible to alter this behavior though configuration?

Thanks,
Murray