But, I want to use rlm_rewrite_attr or rewrite_filter.
Look at my comments below.

Nicolas Baradakis wrote: 
kevin wrote:

I want to get some idea about how to manipulate attributes before we 
respond to NAS.

For example, before I send Access-Accept packet to the NAS, I want to 
add two additional attributes (let's say S and T) to NAS-1 and add X, Y, 
and Z to NAS-2.  In short, I want to add some attributes differently 
based on the NAS IP or Client IP.  How can I do that?


In the "users" file:

DEFAULT NAS-IP-Address == 10.0.0.1
	Attribute-S := Value-S,
	Attribute-T := Value-T

DEFAULT NAS-IP-Address == 10.0.0.2
	Attribute-X := Value-X,
	Attribute-Y := Value-Y,
	Attribute-Z := Value-Z
What I want to do is something like
if (Calling-Station-ID == 5045551234) then add some filters to the DEFAULT reply attributes.
It seems that rewrite_filter cannot add some attributes to DEFAULT and rewrite_attr cannot check any condition.  Does anybody know how to do it?

Kevin