freeradius & redback sms

[Samson Martinez]

We are currently using a Redback SMS 500 to terminate PPPoE sessions for
client desktops. Up until now an older Steelbelted Radius server has
been used to authenticate RADIUS requests forwarded by the Redback and
it's worked ok. We want to transfer the RADIUS support to a freeradius
installation but I am having a bit of a fit trying to get it to work.

We are running freeradius version 1.0.1, I've added the
dictionary.redback reference to the dictionary file, added the secret &
shortname to the clients.conf file, and I get this on the redback when
trying to authenticate:

09:10:40 9May2007: %RAD-7-SEND_IPADDR: Sent to 10.103.0.4:  port 1812
09:10:40 9May2007: %RAD-7-SPKT: Sent packet:
  0x01 00 00 4f 65 0f 55 dd 7c a2 0b 7d a4 bf a0 b3
    85 37 a3 4e 01 0d 6a 61 6b 65 31 40 6c 6f 63 61
    6c 03 13 01 c7 24 7a b9 3e 1f 8d ec bc ea 4d 35
    84 10 2d cf 20 09 52 65 64 42 61 63 6b 06 06 00
    00 00 02 07 06 00 00 00 01 05 06 07 00 00 01
09:10:40 9May2007: %RAD-7-RPKT: Received packet:
  0x02 00 00 20 c8 c3 8a c4 dc d3 6a 6b 59 a4 25 57
    ea 1a ba 06 06 06 00 00 00 02 07 06 00 00 00 01

09:10:41 9May2007: %RAD-7-RATTR_I: Received attr type 6, val 2, status
0.
09:10:41 9May2007: %RAD-7-RATTR_I: Received attr type 7, val 1, status
0.
09:10:41 9May2007: %RAD-7-RATTR_NO_CN: Global authentication configured,
but no Context-Name provided.

Speaking of which, what should my nastype in the clients.conf file be? I
entered redback but I couldn't confirm if that was correct.

Thanks!

-Samson