In 'man unlang' it says: !* Delete all occurances of the named attribute, no matter what the value. I've just found that update reply { Framed-IP-Address !* "" } generates a run-time error: ERROR: Failed parsing value "" for attribute Framed-IP-Address: Failed to find IP address for You also can't write update reply { Framed-IP-Address !* ANY } as this generates an error on startup: Module: Loading virtual module applyFilterOnPasswordError /etc/freeradius/policy.conf[162]: ERROR: Failed to find IP address for ANY /etc/freeradius/policy.conf[158]: Failed to parse "update" subsection. What you apparently need is: update reply { Framed-IP-Address !* 0.0.0.0 } If this isn't considered a bug, I suggest the manpage is updated. e.g. "Delete all occurances of the name attribute, no matter what the value. However, the value you provide must still be consistent with the type of the attribute being removed, e.g. Framed-IP-Address !* 0.0.0.0 Regards, Brian.