Contenido

Introducción

Este documento muestra cómo configurar un escenario de Virtual Private Dialup Network (VPDN) de Layer 2 Tunnel Protocol (L2TP) usando atributos de túnel descargados de un servidor RADIUS. En este ejemplo, el L2TP Access Concentrator (LAC) recibe la conexión entrante y entra en contacto con el servidor RADIUS LAC. El servidor RADIUS busca los atributos del túnel para el dominio del usuario (por ejemplo, cisco.com) y pasa los atributos del túnel al LAC. Según estos atributos, el LAC inicia un túnel con el Servidor de Red L2TP (LNS). Una vez que se establece el túnel, el LNS autentica al usuario final usando su propio servidor RADIUS.

Nota: Este documento asume que el NAS (LAC) se ha configurado para el acceso general del dial. Para más información sobre cómo configurar el dial, refiera a configurar el Basic AAA RADIUS para los clientes dial in.

Para más información sobre el L2TP y los VPDN, refiera a estos documentos:

prerrequisitos

Requisitos

No hay requisitos específicos para este documento.

Componentes Utilizados

La información que contiene este documento se basa en las siguientes versiones de software y hardware.

La información que contiene este documento se creó a partir de los dispositivos en un ambiente de laboratorio específico. Todos los dispositivos que se utilizan en este documento se pusieron en funcionamiento con una configuración verificada (predeterminada). Si la red está funcionando, asegúrese de haber comprendido el impacto que puede tener cualquier comando.

Convenciones

Para obtener más información sobre las convenciones del documento, consulte Convenciones de Consejos Técnicos de Cisco.

Configuración del servidor de RADIUS

En esta sección encontrará la información para configurar las funciones descritas en este documento.

Nota: Para obtener información adicional sobre los comandos que se utilizan en este documento, use la Command Lookup Tool (solo para clientes registrados).

Diagrama de la red

Este documento utiliza la configuración de red que se muestra en el siguiente diagrama.

l2tprad-1.gif

Configuración de RADIUS LAC - Cisco Secure ACS para UNIX

La configuración de RADIUS LAC incluye al usuario “rtp.cisco.com” (que es el dominio usado por el cliente). La contraseña para este usuario debe ser Cisco.

# ./ViewProfile -p 9900 -u rtp.cisco.com
user = rtp.cisco.com{
radius=Cisco {
check_items= {
2="cisco"
} 
reply_attributes= {
6=5
9,1="vpdn:tunnel-id=DEFGH"
9,1="vpdn:tunnel-type=l2tp"
9,1="vpdn:ip-addresses=10.31.1.9"
9,1="vpdn:l2tp-tunnel-password=ABCDE"
} 
} 
}

Para más información sobre la configuración de RADIUS en el LAC, refiera al perfil de RADIUS para uso de la sección LAC dentro del Tunnel Protocol de la capa 2.

Configuración de RADIUS LNS - Cisco Secure ACS para UNIX

# ./ViewProfile -p 9900 -u janedoe@rtp.cisco.com
user = janedoe@rtp.cisco.com{
radius=Cisco {
check_items= {
2="rtp"
} 
reply_attributes= {
6=2
7=1
} 
} 
 
}

Configuración de RADIUS LAC - Cisco Secure ACS for Windows

Complete estos pasos:

  1. En el área de la configuración de red, configure la autenticación del LAC Network Access Server (NAS) para utilizar RADIUS (Cisco IOS/PIX).

  2. Configure al usuario “rtp.cisco.com” con la palabra clave Cisco para el bothplain y AGRIÉTELO. Éste es el nombre de usuario que se utiliza para los atributos del túnel.

  3. Haga clic en el botón de la configuración de grupo en la barra de navegación izquierda. Seleccione al grupo que el usuario pertenece a y el tecleo edita las configuraciones. Navegue hacia abajo a la sección del IETF RADIUS y seleccione el tipo de servicio del atributo 6 como saliente.

    Si no aparece toda la opciones que pueden marcar, entre la configuración de la interfaz y marque los diversos cuadros para hacer que aparecen en el área del grupo.

  4. En la sección de los atributos de RADIUS de Cisco IOS/PIX en la parte inferior, marque el cuadro para el Cisco-av-pair 009\001, y teclee esto en el cuadro:

    vpdn:tunnel-id=DEFGH
    vpdn:tunnel-type=l2tp
    vpdn:ip-addresses=10.31.1.9
    vpdn:l2tp-tunnel-password=ABCDE

    Para más información sobre la configuración de RADIUS en el LAC, refiera al perfil de RADIUS para uso de la sección LAC dentro del Tunnel Protocol de la capa 2.

    l2tprad-2.gif

Configuración de RADIUS LNS - Cisco Secure ACS for Windows

Complete estos pasos:

  1. Configure la identificación del usuario janedoe@rtp.cisco.com y entre cualquier contraseña para el llano y la GRIETA.

  2. Haga clic en el botón Group Setup Button en la barra izquierda. Seleccione al grupo que el usuario pertenece a y el tecleo edita las configuraciones.

  3. En la sección para los atributos de RADIUS de la Fuerza de tareas de ingeniería en Internet (IETF) (IETF), tipo de servicio selecto (atributo 6) = Framed y Protocolo Entramado (atributo 7)=PPP del menú desplegable.

    Nota: Usted debe también hacer clic el checkbox situado al lado de los atributos seleccionados tipo de servicio y Protocolo Entramado.

Configuración de LAC RADIUS – Merit RADIUS

Nota: Los servidores de Livingston y del Merit se deben modificar con frecuencia para soportar los AV-pares específicos del vendedor.

rtp.cisco.com   Password = "cisco"
        Service-Type = Outbound-User,
    cisco-avpair = "vpdn:tunnel-id=DEFGH",
    cisco-avpair = "vpdn:tunnel-type=l2tp",
    cisco-avpair = "vpdn:ip-addresses=10.31.1.9",
    cisco-avpair = "vpdn:l2tp-tunnel-password=ABCDE"

Para más información sobre la configuración de RADIUS en el LAC, refiera al perfil de RADIUS para uso de la sección LAC dentro del Tunnel Protocol de la capa 2.

Configuración de LNS RADIUS - Merit RADIUS

janedoe@rtp.cisco.com   Password = "rtp",
                Service-Type = Framed,
                Framed-Protocol = PPP

Configuración del router

Este documento usa estas configuraciones.

Configuración del router LAC
LAC#show run
Building configuration...

Current configuration:
!
version 12.0
service timestamps debug datetime
service timestamps log uptime
no service password-encryption
!
hostname LAC
!

!--- AAA commands needed to authenticate the user and obtain !--- VPDN tunnel information.

aaa new-model
aaa authentication login default local
aaa authentication ppp default if-needed radius
aaa authorization network default radius
aaa accounting exec default start-stop radius
aaa accounting network default start-stop radius
enable secret level 7 5 $1$Dj3K$9jkyuJR6fJV2JO./Qt0lC1
enable password ww
!
username cse password 0 csecse
username john password 0 doe
ip subnet-zero
no ip domain-lookup
!
jnj00=tfdfr
vpdn enable
!

!--- VPDN tunnel authorization is based on the domain name !--- (the default is DNIS).

vpdn search-order domain 
!
!
!
interface Loopback0
 no ip address
 no ip directed-broadcast
!
interface Ethernet0
 ip address 10.31.1.6 255.255.255.0
 no ip directed-broadcast
!
interface Serial0
 no ip address
 no ip directed-broadcast
 no ip mroute-cache
 shutdown
!
interface Serial1
 no ip address
 no ip directed-broadcast
 shutdown
!
interface Async1
 ip unnumbered Ethernet0
 no ip directed-broadcast
 ip tcp header-compression passive
 encapsulation ppp
 async mode dedicated
 peer default ip address pool async
 no cdp enable
 ppp authentication chap
!
interface Group-Async1
 physical-layer async
 no ip address
 no ip directed-broadcast
!
ip local pool default 10.5.5.5 10.5.5.50
ip local pool async 10.7.1.1 10.7.1.5
ip classless
ip route 0.0.0.0 0.0.0.0 10.31.1.1
!

!--- RADIUS server host and key.

radius-server host 171.68.118.101 auth-port 1645 acct-port 1646
radius-server key cisco
!
line con 0
 transport input none
line 1
 session-timeout 20 
 exec-timeout 0 0
 password ww
 autoselect during-login
 autoselect ppp
 modem InOut
 transport preferred none
 transport output none
 stopbits 1
 speed 38400
 flowcontrol hardware
line 2 16
 modem InOut
 transport input all
 speed 38400
 flowcontrol hardware
line aux 0
line vty 0 4
 password ww
!
end

Configuración del router LNS
LNS#show run
Building configuration...

Current configuration:
!
! Last configuration change at 12:17:54 UTC Sun Feb 7 1999
!==m6knr5yui6yt6egv2wr25nfd1rsion 12.0=4rservice exec-callback
service timestamps debug datetime
service timestamps log uptime
no service password-encryption
!
hostname LNS
!
aaa new-model
aaa authentication login default local
aaa authentication ppp default radius local
aaa authorization network default radius local
aaa accounting exec default start-stop radius
aaa accounting network default start-stop radius
enable secret 5 $1$pnYM$B.FveZjZpgA3C9ZPq/cma/
enable password ww
!
username john password 0 doe

!--- User the_LNS is used to authenticate the tunnel. !--- The password used here must match the vpdn:l2tp-tunnel-password !--- configured in the LAC RADIUS server.

username the_LNS password 0 ABCDE
ip subnet-zero
!

!--- Enable VPDN on the LNS.

vpdn enable
!

!--- VPDN group for connection from the LAC.

vpdn-group 1

!--- This command specifies that the router uses !--- virtual-template 1 for tunnel-id DEFGH (which matches the tunnel-id !--- configured in the LAC RADIUS server).

 accept dialin l2tp virtual-template 1 remote DEFGH

!--- The username used to authenticate this tunnel !--- is the_LNS (configured above).

 local name the_LNS
!
interface Ethernet0
 ip address 10.31.1.9 255.255.255.0
 no ip directed-broadcast
!

!--- Virtual-template that is used for the incoming connection.

interface Virtual-Template1
 ip unnumbered Ethernet0
 no ip directed-broadcast
 peer default ip address pool default
 ppp authentication chap
!
interface Serial0
 no ip address
 no ip directed-broadcast
 no ip mroute-cache
 shutdown
 no fair-queue
!
interface Serial1
 no ip address
 no ip directed-broadcast
 shutdown
!
interface Async1
 ip unnumbered Ethernet0
 no ip directed-broadcast
 encapsulation ppp
 async mode interactive
 peer default ip address pool async
 ppp authentication chap
!
ip local pool default 10.6.1.1 10.6.1.5
ip local pool async 10.8.100.100 10.8.100.110
ip classless
ip route 0.0.0.0 0.0.0.0 10.31.1.1
!

!--- RADIUS server host and key information.

radius-server host 171.68.120.194 auth-port 1645 acct-port 1646
radius-server key cisco
!
line con 0
 transport input none
line 1
 session-timeout 20 
 exec-timeout 5 0
 password ww
 autoselect during-login
 autoselect ppp
 modem InOut
 transport input all
 escape-character BREAK
 stopbits 1
 speed 38400
 flowcontrol hardware
line 2 8
line aux 0
line vty 0 4
 password ww
!
end

Verificación

En esta sección encontrará información que puede utilizar para confirmar que su configuración esté funcionando correctamente.

La herramienta Output Interpreter (sólo para clientes registrados) permite utilizar algunos comandos “show” y ver un análisis del resultado de estos comandos.

Troubleshooting

En esta sección encontrará información que puede utilizar para solucionar problemas de configuración.

Comandos para resolución de problemas

Nota: Antes de ejecutar un comando debug, consulte Información Importante sobre Comandos Debug.

‘Resultado de debug’

Para la descripción detallada de los debugs L2TP, refiera a la configuración de túnel y al desmontaje L2TP.

Depuración correcta del router LAC

LAC#show debug
General OS:
  AAA Authentication debugging is on
  AAA Authorization debugging is on
  AAA Accounting debugging is on
VPN:
  L2X protocol events debugging is on
  L2X protocol errors debugging is on
  VPDN events debugging is on
  VPDN errors debugging is on
  L2TP data sequencing debugging is on
VTEMPLATE:
  Virtual Template debugging is on
Radius protocol debugging is on
LAC#
Feb  7 12:22:16: As1 AAA/AUTHOR/FSM: (0): 
    LCP succeeds trivially
2d18h: %LINK-3-UPDOWN: Interface Async1, 
    changed state to up
Feb  7 12:22:17: As1 VPDN: Looking for tunnel 
    -- rtp.cisco.com --
Feb  7 12:22:17: AAA: parse name=Async1 idb 
    type=10 tty=1
Feb  7 12:22:17: AAA: name=Async1 flags=0x11 
    type=4 shelf=0 slot=0 
    adapter=0 port=1 channel=0
Feb  7 12:22:17: AAA/AUTHEN: create_user (0x25BA84) 
    user='rtp.cisco.com' ruser='' port='Async1' rem_addr='' 
    authen_type=NONE service=LOGIN priv=0
Feb  7 12:22:17: AAA/AUTHOR/VPDN (6239469): 
    Port='Async1' list='default' service=NET
Feb  7 12:22:17: AAA/AUTHOR/VPDN:  (6239469) 
    user='rtp.cisco.com'
Feb  7 12:22:17: AAA/AUTHOR/VPDN:  (6239469) 
    send AV service=ppp
Feb  7 12:22:17: AAA/AUTHOR/VPDN:  (6239469) 
    send AV protocol=vpdn
Feb  7 12:22:17: AAA/AUTHOR/VPDN (6239469) 
    found list "default"
Feb  7 12:22:17: AAA/AUTHOR/VPDN:  (6239469) Method=RADIUS
Feb  7 12:22:17: RADIUS: authenticating to get author data
Feb  7 12:22:17: RADIUS: ustruct sharecount=2
Feb  7 12:22:17: RADIUS: Initial Transmit Async1 id 66 
    171.68.118.101:1645, Access-Request, len 77
Feb  7 12:22:17:         Attribute 4 6 0A1F0106
Feb  7 12:22:17:         Attribute 5 6 00000001
Feb  7 12:22:17:         Attribute 61 6 00000000
Feb  7 12:22:17:         Attribute 1 15 7274702E
Feb  7 12:22:17:         Attribute 2 18 6AB5A2B0
Feb  7 12:22:17:         Attribute 6 6 00000005
Feb  7 12:22:17: RADIUS: Received from id 66 
    171.68.118.101:1645, Access-Accept, len 158
Feb  7 12:22:17:         Attribute 6 6 00000005
Feb  7 12:22:17:         Attribute 26 28 0000000901167670
Feb  7 12:22:17:         Attribute 26 29 0000000901177670
Feb  7 12:22:17:         Attribute 26 36 00000009011E7670
Feb  7 12:22:17:         Attribute 26 39 0000000901217670
Feb  7 12:22:17: RADIUS: saved authorization data for user 
    25BA84 at 24C488

!--- RADIUS server supplies the VPDN tunnel attributes.

Feb  7 12:22:17: RADIUS: cisco AVPair 
    "vpdn:tunnel-id=DEFGH"
Feb  7 12:22:17: RADIUS: cisco AVPair 
    "vpdn:tunnel-type=l2tp"
Feb  7 12:22:17: RADIUS: cisco AVPair 
    "vpdn:ip-addresses=10.31.1.9,"
Feb  7 12:22:17: RADIUS: cisco AVPair 
    "vpdn:l2tp-tunnel-password=ABCDE"
Feb  7 12:22:17: AAA/AUTHOR (6239469): Post 
    authorization status = PASS_ADD
Feb  7 12:22:17: AAA/AUTHOR/VPDN: Processing 
    AV service=ppp
Feb  7 12:22:17: AAA/AUTHOR/VPDN: Processing 
    AV protocol=vpdn
Feb  7 12:22:17: AAA/AUTHOR/VPDN: Processing 
    AV tunnel-id=DEFGH
Feb  7 12:22:17: AAA/AUTHOR/VPDN: Processing 
    AV tunnel-type=l2tp
Feb  7 12:22:17: AAA/AUTHOR/VPDN: Processing AV 
    ip-addresses=10.31.1.9,
Feb  7 12:22:17: AAA/AUTHOR/VPDN: Processing AV 
    l2tp-tunnel-password=ABCDE
Feb  7 12:22:17: As1 VPDN: Get tunnel info for 
    rtp.cisco.com with LAC DEFGH, IP 10.31.1.9
Feb  7 12:22:17: AAA/AUTHEN: free_user (0x25BA84) 
    user='rtp.cisco.com' ruser='' port='Async1' rem_addr='' 
    authen_type=NONE service=LOGIN priv=0
Feb  7 12:22:17: As1 VPDN: Forward to address 10.31.1.9
Feb  7 12:22:17: As1 VPDN: Forwarding...
Feb  7 12:22:17: AAA: parse name=Async1 idb 
    type=10 tty=1
Feb  7 12:22:17: AAA: name=Async1 flags=0x11 type=4 
    shelf=0 slot=0 adapter=0 port=1 channel=0
Feb  7 12:22:17: AAA/AUTHEN: create_user (0xB7918) 
    user='janedoe@rtp.cisco.com' ruser='' port='Async1' 
    rem_addr='async' authen_type=CHAP service=PPP priv=1
Feb  7 12:22:17: As1 VPDN: Bind interface direction=1
Feb  7 12:22:17: Tnl/Cl 51/1 L2TP: Session FS enabled
Feb  7 12:22:17: Tnl/Cl 51/1 L2TP: Session state change 
    from idle to wait-for-tunnel
Feb  7 12:22:17: As1 51/1 L2TP: Create session
Feb  7 12:22:17: Tnl 51 L2TP: SM State idle
Feb  7 12:22:17: Tnl 51 L2TP: O SCCRQ 
Feb  7 12:22:17: Tnl 51 L2TP: Tunnel state change 
    from idle to wait-ctl-reply
Feb  7 12:22:17: Tnl 51 L2TP: SM State wait-ctl-reply
Feb  7 12:22:17: As1 VPDN: janedoe@rtp.cisco.com 
    is forwarded
Feb  7 12:22:17: Tnl 51 L2TP: I SCCRP from the_LNS

!--- Tunnel authentication is successful.

Feb  7 12:22:17: Tnl 51 L2TP: Got a challenge from remote 
    peer, the_LNS
Feb  7 12:22:17: Tnl 51 L2TP: Got a response from remote 
    peer, the_LNS
Feb  7 12:22:17: Tnl 51 L2TP: Tunnel Authentication 
    success
Feb  7 12:22:17: Tnl 51 L2TP: Tunnel state change from 
    wait-ctl-reply to established
Feb  7 12:22:17: Tnl 51 L2TP: O SCCCN  to the_LNS tnlid 38
Feb  7 12:22:17: Tnl 51 L2TP: SM State established
Feb  7 12:22:17: As1 51/1 L2TP: O ICRQ to the_LNS 38/0
Feb  7 12:22:17: As1 51/1 L2TP: Session state change from 
    wait-for-tunnel to wait-reply
Feb  7 12:22:17: As1 51/1 L2TP: O ICCN to the_LNS 38/1
Feb  7 12:22:17: As1 51/1 L2TP: Session state change from 
    wait-reply to established
2d18h: %LINEPROTO-5-UPDOWN: Line protocol on Interface 
    Async1, changed state to up
LAC#

Depuración correcta del router LNS

LNS#show debug
General OS:
  AAA Authentication debugging is on
  AAA Authorization debugging is on
  AAA Accounting debugging is on
VPN:
  L2X protocol events debugging is on
  L2X protocol errors debugging is on
  VPDN events debugging is on
  VPDN errors debugging is on
  L2TP data sequencing debugging is on
VTEMPLATE:
  Virtual Template debugging is on
Radius protocol debugging is on
LNS#
Feb  7 12:22:16: L2TP: I SCCRQ from DEFGH tnl 51

Feb  7 12:22:16: Tnl 38 L2TP: New tunnel created for 
    remote DEFGH, address 10.31.1.6
Feb  7 12:22:16: Tnl 38 L2TP: Got a challenge in SCCRQ, 
    DEFGH
Feb  7 12:22:16: Tnl 38 L2TP: O SCCRP  to DEFGH tnlid 51
Feb  7 12:22:16: Tnl 38 L2TP: Tunnel state change from 
    idle to wait-ctl-reply
Feb  7 12:22:16: Tnl 38 L2TP: I SCCCN from DEFGH tnl 51
Feb  7 12:22:16: Tnl 38 L2TP: Got a Challenge Response 
    in SCCCN from DEFGH
Feb  7 12:22:16: Tnl 38 L2TP: Tunnel Authentication 
    success
Feb  7 12:22:16: Tnl 38 L2TP: Tunnel state change from 
    wait-ctl-reply to established
Feb  7 12:22:16: Tnl 38 L2TP: SM State established
Feb  7 12:22:17: Tnl 38 L2TP: I ICRQ from DEFGH tnl 51
Feb  7 12:22:17: Tnl/Cl 38/1 L2TP: Session FS enabled
Feb  7 12:22:17: Tnl/Cl 38/1 L2TP: Session state change 
    from idle to wait-for-tunnel
Feb  7 12:22:17: Tnl/Cl 38/1 L2TP: New session created
Feb  7 12:22:17: Tnl/Cl 38/1 L2TP: O ICRP to DEFGH 51/1
Feb  7 12:22:17: Tnl/Cl 38/1 L2TP: Session state change 
    from wait-for-tunnel to wait-connect
Feb  7 12:22:17: Tnl/Cl 38/1 L2TP: I ICCN from DEFGH tnl 
    51, cl 1
Feb  7 12:22:17: Tnl/Cl 38/1 L2TP: Session state change 
    from wait-connect to established
Feb  7 12:22:17: Vi1 VTEMPLATE: Reuse Vi1, recycle 
    queue size 0
Feb  7 12:22:17: Vi1 VTEMPLATE: Hardware address 
    00e0.1e68.942c

!--- Use Virtual-template 1 for this user.

Feb  7 12:22:17: Vi1 VPDN: Virtual interface created for 
    janedoe@rtp.cisco.com
Feb  7 12:22:17: Vi1 VPDN: Set to Async interface
Feb  7 12:22:17: Vi1 VPDN: Clone from Vtemplate 1 
    filterPPP=0 blocking
Feb  7 12:22:17: Vi1 VTEMPLATE: Has a new cloneblk vtemplate, 
    now it has vtemplate
Feb  7 12:22:17: Vi1 VTEMPLATE: ************* CLONE 
    VACCESS1 *****************
Feb  7 12:22:17: Vi1 VTEMPLATE: Clone from 
    Virtual-Template1
interface Virtual-Access1
default ip address
no ip address
encap ppp
ip unnum eth 0
no ip directed-broadcast
peer default ip address pool default
ppp authen chap
end

Feb  7 12:22:18: janedoe@rtp.cisco.com 38/1 L2TP: Session 
    with no hwidb
02:23:59: %LINK-3-UPDOWN: Interface Virtual-Access1, 
    changed state to up
Feb  7 12:22:19: Vi1 AAA/AUTHOR/FSM: (0): LCP succeeds 
    trivially
Feb  7 12:22:19: Vi1 VPDN: Bind interface direction=2
Feb  7 12:22:19: Vi1 VPDN: PPP LCP accepted rcv CONFACK
Feb  7 12:22:19: Vi1 VPDN: PPP LCP accepted sent CONFACK
Feb  7 12:22:19: Vi1 L2X: Discarding packet because of 
    no mid/session
Feb  7 12:22:19: AAA: parse name=Virtual-Access1 idb 
    type=21 tty=-1
Feb  7 12:22:19: AAA: name=Virtual-Access1 flags=0x11 
    type=5 shelf=0 slot=0 adapter=0 port=1 channel=0
Feb  7 12:22:19: AAA/AUTHEN: create_user (0x2462A0) 
    user='janedoe@rtp.cisco.com' ruser='' port='Virtual-Access1' 
    rem_addr='' authen_type=CHAP service=PPP priv=1
Feb  7 12:22:19: AAA/AUTHEN/START (2229277178): 
    port='Virtual-Access1' list='' action=LOGIN 
    service=PPP
Feb  7 12:22:19: AAA/AUTHEN/START (2229277178): 
    using "default" list
Feb  7 12:22:19: AAA/AUTHEN/START (2229277178): 
    Method=RADIUS
Feb  7 12:22:19: RADIUS: ustruct sharecount=1
Feb  7 12:22:19: RADIUS: Initial Transmit Virtual-Access1 
    id 78 171.68.120.194:1645, Access-Request, len 92
Feb  7 12:22:19:         Attribute 4 6 0A1F0109
Feb  7 12:22:19:         Attribute 5 6 00000001
Feb  7 12:22:19:         Attribute 61 6 00000005
Feb  7 12:22:19:         Attribute 1 23 6464756E
Feb  7 12:22:19:         Attribute 3 19 34A66389
Feb  7 12:22:19:         Attribute 6 6 00000002
Feb  7 12:22:19:         Attribute 7 6 00000001
Feb  7 12:22:19: RADIUS: Received from id 78 
    171.68.120.194:1645, Access-Accept, len 32
Feb  7 12:22:19:         Attribute 6 6 00000002
Feb  7 12:22:19:         Attribute 7 6 00000001
Feb  7 12:22:19: AAA/AUTHEN (2229277178): status = PASS
Feb  7 12:22:19: Vi1 AAA/AUTHOR/LCP: Authorize LCP
Feb  7 12:22:19: AAA/AUTHOR/LCP Vi1 (1756915964): 
    Port='Virtual-Access1' list='' service=NET
Feb  7 12:22:19: AAA/AUTHOR/LCP: Vi1 (1756915964) 
    user='janedoe@rtp.cisco.com'
Feb  7 12:22:19: AAA/AUTHOR/LCP: Vi1 (1756915964) 
    send AV service=ppp
Feb  7 12:22:19: AAA/AUTHOR/LCP: Vi1 (1756915964) 
    send AV protocol=lcp
Feb  7 12:22:19: AAA/AUTHOR/LCP (1756915964) found 
    list "default"
Feb  7 12:22:19: AAA/AUTHOR/LCP: Vi1 (1756915964) 
    Method=RADIUS
Feb  7 12:22:19: AAA/AUTHOR (1756915964): Post 
    authorization status = PASS_REPL
Feb  7 12:22:19: Vi1 AAA/AUTHOR/LCP: Processing 
    AV service=ppp
Feb  7 12:22:19: AAA/ACCT/NET/START User 
    janedoe@rtp.cisco.com, Port Virtual-Access1, List ""
Feb  7 12:22:19: AAA/ACCT/NET: Found list "default"
Feb  7 12:22:19: Vi1 AAA/AUTHOR/FSM: (0): Can we 
    start IPCP?
Feb  7 12:22:19: AAA/AUTHOR/FSM Vi1 (1311872588): 
    Port='Virtual-Access1' list='' service=NET
Feb  7 12:22:19: AAA/AUTHOR/FSM: Vi1 (1311872588) 
    user='janedoe@rtp.cisco.com'
Feb  7 12:22:19: AAA/AUTHOR/FSM: Vi1 (1311872588) 
    send AV service=ppp
Feb  7 12:22:19: AAA/AUTHOR/FSM: Vi1 (1311872588) 
    send AV protocol=ip
Feb  7 12:22:19: AAA/AUTHOR/FSM (1311872588) 
    found list "default"
Feb  7 12:22:19: AAA/AUTHOR/FSM: Vi1 (1311872588) 
    Method=RADIUS
Feb  7 12:22:19: AAA/AUTHOR (1311872588): Post 
    authorization status = PASS_REPL
Feb  7 12:22:19: Vi1 AAA/AUTHOR/FSM: We can start 
    IPCP
Feb  7 12:22:19: RADIUS: ustruct sharecount=2
Feb  7 12:22:19: RADIUS: Initial Transmit Virtual-Access1 
    id 79 171.68.120.194:1646, Accounting-Request, len 101
Feb  7 12:22:19:         Attribute 4 6 0A1F0109
Feb  7 12:22:19:         Attribute 5 6 00000001
Feb  7 12:22:19:         Attribute 61 6 00000005
Feb  7 12:22:19:         Attribute 1 23 6464756E
Feb  7 12:22:19:         Attribute 40 6 00000001
Feb  7 12:22:19:         Attribute 45 6 00000001
Feb  7 12:22:19:         Attribute 6 6 00000002
Feb  7 12:22:19:         Attribute 44 10 30303030
Feb  7 12:22:19:         Attribute 7 6 00000001
Feb  7 12:22:19:         Attribute 41 6 00000000
Feb  7 12:22:19: Vi1 AAA/AUTHOR/IPCP: Start.  Her 
    address 0.0.0.0, we want 0.0.0.0
Feb  7 12:22:19: Vi1 AAA/AUTHOR/IPCP: Processing 
    AV service=ppp
Feb  7 12:22:19: Vi1 AAA/AUTHOR/IPCP: Authorization 
    succeeded
Feb  7 12:22:19: Vi1 AAA/AUTHOR/IPCP: Done.  Her 
    address 0.0.0.0, we want 0.0.0.0
Feb  7 12:22:19: RADIUS: Received from id 79 
    171.68.120.194:1646, Accounting-response, 
    len 20
Feb  7 12:22:19: Vi1 AAA/AUTHOR/IPCP: Start.  
    Her address 0.0.0.0, we want 10.6.1.1
Feb  7 12:22:19: Vi1 AAA/AUTHOR/IPCP: Processing 
    AV service=ppp
Feb  7 12:22:19: Vi1 AAA/AUTHOR/IPCP: Authorization 
    succeeded
Feb  7 12:22:19: Vi1 AAA/AUTHOR/IPCP: Done.  
    Her address 0.0.0.0, we want 10.6.1.1
Feb  7 12:22:19: Vi1 AAA/AUTHOR/IPCP: Start.  
    Her address 10.6.1.1, we want 10.6.1.1
Feb  7 12:22:19: AAA/AUTHOR/IPCP Vi1 (2909132255): 
    Port='Virtual-Access1' list='' service=NET
Feb  7 12:22:19: AAA/AUTHOR/IPCP: Vi1 (2909132255) 
    user='janedoe@rtp.cisco.com'
Feb  7 12:22:19: AAA/AUTHOR/IPCP: Vi1 (2909132255) 
    send AV service=ppp
Feb  7 12:22:19: AAA/AUTHOR/IPCP: Vi1 (2909132255) 
    send AV protocol=ip
Feb  7 12:22:19: AAA/AUTHOR/IPCP: Vi1 (2909132255) 
    send AV addr*10.6.1.1
Feb  7 12:22:19: AAA/AUTHOR/IPCP (2909132255) 
    found list "default"
Feb  7 12:22:19: AAA/AUTHOR/IPCP: Vi1 (2909132255) 
    Method=RADIUS
Feb  7 12:22:19: AAA/AUTHOR (2909132255): Post 
    authorization status = PASS_REPL
Feb  7 12:22:19: Vi1 AAA/AUTHOR/IPCP: Reject 
    10.6.1.1, using 10.6.1.1
Feb  7 12:22:19: Vi1 AAA/AUTHOR/IPCP: Processing 
    AV service=ppp
Feb  7 12:22:19: Vi1 AAA/AUTHOR/IPCP: Processing 
    AV addr*10.6.1.1
Feb  7 12:22:19: Vi1 AAA/AUTHOR/IPCP: Authorization 
    succeeded
Feb  7 12:22:19: Vi1 AAA/AUTHOR/IPCP: Done.  
    Her address 10.6.1.1, we want 10.6.1.1
02:24:00: %LINEPROTO-5-UPDOWN: Line protocol on 
    Interface Virtual-Access1, changed state to up
LNS#

‘Lo que puede salir mal – mala depuración desde LAC’

LAC#show debug
General OS:
  AAA Authentication debugging is on
  AAA Authorization debugging is on
  AAA Accounting debugging is on
VPN:
  L2X protocol events debugging is on
  L2X protocol errors debugging is on
  VPDN events debugging is on
  VPDN errors debugging is on
  L2TP data sequencing debugging is on
VTEMPLATE:
  Virtual Template debugging is on
Radius protocol debugging is on

El usuario entra como janedoe@sj.cisco.com (en vez de janedoe@rtp.cisco.com), pero el servidor de RADIUS LAC no reconoce este dominio.

Feb  7 13:26:48: RADIUS: Received from id 86 
    171.68.118.101:1645, Access-Reject, len 46
Feb  7 13:26:48:         Attribute 18 26 41757468
Feb  7 13:26:48: RADIUS: failed to get 
    authorization data: authen status = 2
%VPDN-6-AUTHORFAIL: L2F NAS LAC, AAA authorization 
    failure for As1 user janedoe@sj.cisco.com

Estos debugs muestran una situación donde se recibe la información del túnel, pero con una dirección IP no válida para el otro extremo del túnel. El usuario intenta establecer una sesión, pero no puede conectar.

Feb  7 13:32:45: As1 VPDN: Forward to 
    address 1.1.1.1
Feb  7 13:32:45: As1 VPDN: Forwarding...
Feb  7 13:32:45: Tnl 56 L2TP: Tunnel state 
    change from idle to wait-ctl-reply
Feb  7 13:32:46: As1 56/1 L2TP: Discarding data 
    packet because tunnel is not open

Estos debugs muestran una situación cuando hay una discordancía de la contraseña del túnel. En el LNS, “la contraseña ABCDE del the_LNS del nombre de usuario” se cambia “al password garbage del the_LNS del nombre de usuario” de modo que la autenticación de túnel falle cuando esté intentada.

Feb  7 13:39:35: Tnl 59 L2TP: Tunnel Authentication 
    fails for the_LNS
Feb  7 13:39:35: Tnl 59 L2TP: Expected 
    E530DA13B826685C678589250C0BF525
Feb  7 13:39:35: Tnl 59 L2TP: Got 
   E09D90E8A91CF1014C91D56F65BDD052
Feb  7 13:39:35: Tnl 59 L2TP: O StopCCN  
    to the_LNS tnlid 44
Feb  7 13:39:35: Tnl 59 L2TP: Tunnel state 
    change from wait-ctl-reply to shutting-down
Feb  7 13:39:35: Tnl 59 L2TP: Shutdown tunnel

Lo que puede salir mal – Mala depuración desde LNS

LNS#show debug
General OS:
  AAA Authentication debugging is on
  AAA Authorization debugging is on
  AAA Accounting debugging is on
VPN:
  L2X protocol events debugging is on
  L2X protocol errors debugging is on
  VPDN events debugging is on
  VPDN errors debugging is on
  L2TP data sequencing debugging is on
VTEMPLATE:
  Virtual Template debugging is on
Radius protocol debugging is on
LNS#

En este ejemplo, el “accept dialing l2tp virtual-template 1 remote defgh” se cambia al “accept dialin l2tp virtual-template 1 remote junk”. El LNS puede encontrar no más el túnel DEFGH (es “desperdicios” en lugar de otro).

Feb  7 13:45:32: L2TP: I SCCRQ from 
    DEFGH tnl 62
Feb  7 13:45:32: L2X: Never heard of 
    DEFGH
Feb  7 13:45:32: L2TP: Could not find info 
    block for DEFGH

Registros contables LNS

10.31.1.9 janedoe@rtp.cisco.com 1 - start 
    server=rtp-cherry time=09:23:53 
    date=02/ 6/1999 task_id=0000001C 
Sat Feb 6 12:23:53 1999
        Client-Id = 10.31.1.9
        Client-Port-Id = 1
        NAS-Port-Type = Virtual
        User-Name = "janedoe@rtp.cisco.com"
        Acct-Status-Type = Start
        Acct-Authentic = RADIUS
        User-Service-Type = Framed-User
        Acct-Session-Id = "0000001C"
        Framed-Protocol = PPP
        Acct-Delay-Time = 0
 
 
10.31.1.9 janedoe@rtp.cisco.com 1 - stop 
    server=rtp-cherry time=09:24:46 
    date=02/ 6/1999 task_id=0000001C        
Sat Feb  6 12:24:46 1999
        Client-Id = 10.31.1.9
        Client-Port-Id = 1
        NAS-Port-Type = Virtual
        User-Name = "janedoe@rtp.cisco.com"
        Acct-Status-Type = Stop
        Acct-Authentic = RADIUS
        User-Service-Type = Framed-User
        Acct-Session-Id = "0000001C"
        Framed-Protocol = PPP
        Framed-Address = 10.6.1.1
        Acct-Terminate-Cause = Lost-Carrier
        Acct-Input-Octets = 678
        Acct-Output-Octets = 176
        Acct-Input-Packets = 17
        Acct-Output-Packets = 10
        Acct-Session-Time = 53
        Acct-Delay-Time = 0

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