How to triger an application after a authentication done

[ram]

Hi

iam trying to make some iptables rules to trigger after authentication done
with Radius Server

here is my setup

user--------BRAS------Freeradius---Gateway Router(Linux+iptables)--Internet

when the user intiate pppoe with BRAS, bras send the request to Radius

Radius checks the authentication and send to the user for the authorisation.
when use authenticated and authorised. and same time i want to trigger  the
script to open a
Iptable rules and his bandwidth with TC

can some one give me suggestion

how can i achieve this ?

ram
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