Authenticate computers with their hostnames

Difan Zhao difan.zhao at
Fri Apr 16 23:37:03 CEST 2010

Good afternoon,


Sorry to bother you guys again! I am trying to authenticate Windows XP
PCs (sp2) with their hostnames. It looks like PC will try to use its
hostname (in format host/<computer_name.domainname>) to authenticate
when no user is logged in.


I configured the "users" file and also the post-auth section of
"default" file to force accepting the request. In the debug it shows it
does accept and send back the response. I also captured the packets in
the wireshark. However the NAS (Cisco 3750 switch with newest firmware)
doesn't take it and simply ignored it and send the request again. It
repeated three times and eventually failed... 


Users file:

host/      Auth-Type := Accept

        Tunnel-Type:0 = VLAN,

        Tunnel-Medium-Type:0 = IEEE-802,

        Tunnel-Private-Group-Id:0 = "3",

        Tunnel-Preference = 0x000000


Sites-available/default file:

post-auth {


        if(request:User-Name == "host/"){

                update reply {

                        Auth-Type := Accept

                        Tunnel-Type = VLAN

                        Tunnel-Medium-Type = IEEE-802

                        Tunnel-Private-Group-ID = 3

                        Tunnel-Preference = 0






Actually it doesn't look like it's Freeradiusd's problem since it did
send back the response. It's the NAS which doesn't process the reply...
However does anybody know why? Did I miss any attributes? Anyway to work
around this problem?  


Alan, I think you told me once that it's not easy to fool the NAS to
accept all requests... Is this one of the case we are talking about??


Thank you and have a good weekend!



Difan Zhao

Network Engineer

difan.zhao at <> 

Office: 403-509-1010 ext 3048

Cell: 403-689-7514










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