Problem with remove the realm from User-Name Attribute

[huang allen]

Hi,
I am trying to remove the realm from User-Name when FreeRADIUS receive the
access request.
If it have realm in User-Name, the FR will proxy it to other RADIUS server.
and i wish  the FR will remove the realm from User-Name  when it receive any
access request from NAS-IP-Address=192.168.1.1 ,

if using unlang, how to do it

thanks,

Allen
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