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Cisco 802 config and MS IAS / Radius Server

Georg Dingler
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I configured a Cisco 3750 for Radius Authentification for LAN Access in
combination with the MS IAS (Radius) Server. The XP Client has DHCP
configured. The Windows Eventlog tells that Access is granted, but the
XP Client fails to get an IP address. Are additional attributes on the
IAS Server necessary ? Thanks for a tip !

Config of the IAS Server:

Service-Type: Framed
Tunnel-Medium-Type: 802
Tunnel-Pvt-Group-ID: 0x03
Tunnel-Type: Virtual LANs(VLAN)

Certificate is configured and selected on the Windows XP Client.

Config of the 3750:


aaa new-model
aaa authentication login local_authen local
aaa authentication dot1x default group radius
aaa authorization exec local_author local
aaa authorization network default group radius


interface FastEthernet1/0/24
switchport access vlan 3
switchport mode access
switchport port-security
dot1x pae authenticator
dot1x port-control auto


radius-server host auth-port 1812 acct-port 1646 key radius
radius-server source-ports 1645-1646


Windows Eventlog:

Benutzer "DOM\USER_TEST" wurde Zugriff gewährt.
Vollqualifizierter Benutzername =
NAS-IP-Adresse =
NAS-Kennung = <nicht vorhanden>
Clientanzeigename = 3750
Client-IP-Adresse =
Kennung der Anruferstation = [MAC address of the XP Client NIC]
NAS-Porttyp = Ethernet
NAS-Port = 50124
Proxyrichtlinienname = Windows-Authentifizierung für alle Benutzer
Authentifizierungsanbieter = Windows
Authentifizierungsserver = <unbestimmt>
Richtlinienname = 3750
Authentifizierungstyp = PEAP
EAP-Typ = Sicheres Kennwort (EAP-MSCHAP v2)

IAS Server Logfile:,DOM\USER_TEST,11/06/2006,21:38:47,IAS,server,4128,3750,6,2,12,1500,30, 00-13-C3-CE-F2-9A,31,[MAC

address of the XP Client
NIC],5,50124,61,15,4,,4108,, 4116,9,4155,1,4154,Windows-Authentifizierung

für alle Benutzer verwenden,4129,DOM\USER_TEST,4149,3750,25,311 1 11/06/2006 16:54:04 264,4132,Sicheres Kennwort (EAP-MSCHAP
1 11/06/2006 16:54:04 264,4132,Sicheres Kennwort (EAP-MSCHAP
v2),4127,11,8100,0,4108,,4116,9,4155, 1,4154,Windows-Authentifizierung

für alle Benutzer
verwenden,4129,DOM\USER_TEST,4149,3750,6,2,65,6,81 ,0x03,64,13,4130,,4120,0x0148,4136,2,4142,0

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