Add to your dictionary file at /usr/local/etc/raddb/dictionary:

Same file in Freeradius.

VENDORATTR 7000 Slipstream-Auth 1 string

You will find this in there:

#ATTRIBUTE My-Local-String 3000 string
#ATTRIBUTE My-Local-IPAddr 3001 ipaddr
#ATTRIBUTE My-Local-Integer 3002 integer

Change the first one to:

ATTRIBUTE Slipstream-Auth 3000 string

Restart the server for this to take effect. Use the attribute as
instructed (but correct the first line as per instructions in users file
if you are using a recent freeradius version). Attribute should appear
in the Access-Accept packet if all goes well.

Ivan Kalik
Kalik Informatika ISP

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