Nas-Port-Id as username.

Xbert_badstuber lijo09jj at
Wed Apr 25 15:05:50 CEST 2012

We are using the Cisco ACS 5.3 as a RADIUS for database authentication and
authorization. The purpose is to authenticate incoming users based on the
NAS-PORT-ID. The problem is that we cannot find any solution for the Service
Router (Alcatel 7750) to send the NAS-PORT-ID to act as USERNAME. The
username field is set to the MAC address. 

The ACS requires a USERNAME and there is not a way to manipulate the
User-Name value once it is received.   
We heard that it could be possible to use the freeradius to act as a proxy
for the Cisco secure ACS. 

This is what we want: 

User --> [SR] --> User-Name = “MAC:xx.xx.xx.xx” Password = “secret”
NAS-Port-Id = 1/1/4.1001.129 --> [FR] --> User-Name = “1/1/4.1001.129”
Password = “secret” --> [ACS 5.3] 

Is there a solution for this option in the Freeradius? 

Is there a way to manipulate the User-Name sent from the service router,
(MAC address), and change it to its NAS-Port-Id before it reaches the ACS
RADIUS with help from the freeradius acting as a proxy?

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