Configuración de IPSec de IOS a IOS mediante encripción AES

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Actualizado:2 de febrero de 2006

ID del documento:43069

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Contenido

Introducción

Prerequisites

Requirements

Componentes Utilizados

Convenciones

Configurar

Configuraciones

Verificación

Troubleshoot

Comandos para resolución de problemas

Información Relacionada

Introducción

Este documento provee una configuración de ejemplo para un túnel IOS-a-IOS IPSec mediante el encripción del Estándar de encripción avanzado (AES).

Prerequisites

Requirements

La compatibilidad con el cifrado AES se ha introducido en Cisco IOS® 12.2(13)T.

Componentes Utilizados

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

Versión 12.3(10) del software Cisco IOS
Routers Cisco 1721

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). If your network is live, make sure that you understand the potential impact of any command.

Convenciones

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

Configurar

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

Nota: Para encontrar información adicional sobre los comandos utilizados en este documento, utilice la Command Lookup Tool (sólo para clientes registrados) .

Configuraciones

Este documento usa las configuraciones detalladas aquí.

Router 1721-A
Router 1721-B

Router 1721-A
R-1721-A#show run Building configuration... Current configuration : 1706 bytes ! ! Last configuration change at 00:46:32 UTC Fri Sep 10 2004 ! NVRAM config last updated at 00:45:48 UTC Fri Sep 10 2004 ! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname R-1721-A ! boot-start-marker boot-end-marker ! ! memory-size iomem 15 mmi polling-interval 60 no mmi auto-configure no mmi pvc mmi snmp-timeout 180 no aaa new-model ip subnet-zero ip cef ! ! ! ip audit po max-events 100 no ip domain lookup no ftp-server write-enable ! ! ! ! !--- Define Internet Key Exchange (IKE) policy. crypto isakmp policy 10 !--- Specify the 256-bit AES as the !--- encryption algorithm within an IKE policy. encr aes 256 !--- Specify that pre-shared key authentication is used. authentication pre-share !--- Specify the shared secret. crypto isakmp key cisco123 address 10.48.66.146 ! ! !--- Define the IPSec transform set. crypto ipsec transform-set aesset esp-aes 256 esp-sha-hmac ! !--- Define crypto map entry name "aesmap" that will use !--- IKE to establish the security associations (SA). crypto map aesmap 10 ipsec-isakmp !--- Specify remote IPSec peer. set peer 10.48.66.146 !--- Specify which transform sets !--- are allowed for this crypto map entry. set transform-set aesset !--- Name the access list that determines which traffic !--- should be protected by IPSec. match address acl_vpn ! ! ! interface ATM0 no ip address shutdown no atm ilmi-keepalive dsl equipment-type CPE dsl operating-mode GSHDSL symmetric annex A dsl linerate AUTO ! interface Ethernet0 ip address 192.168.100.1 255.255.255.0 ip nat inside half-duplex ! interface FastEthernet0 ip address 10.48.66.147 255.255.254.0 ip nat outside speed auto !--- Apply crypto map to the interface. crypto map aesmap ! ip nat inside source list acl_nat interface FastEthernet0 overload ip classless ip route 0.0.0.0 0.0.0.0 10.48.66.1 ip route 192.168.200.0 255.255.255.0 FastEthernet0 no ip http server no ip http secure-server ! ip access-list extended acl_nat !--- Exclude protected traffic from being NAT'ed. deny ip 192.168.100.0 0.0.0.255 192.168.200.0 0.0.0.255 permit ip 192.168.100.0 0.0.0.255 any !--- Access list that defines traffic protected by IPSec. ip access-list extended acl_vpn permit ip 192.168.100.0 0.0.0.255 192.168.200.0 0.0.0.255 ! ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 ! end R-1721-A#

Router 1721-A

R-1721-A#show run
Building configuration...

Current configuration : 1706 bytes
!
! Last configuration change at 00:46:32 UTC Fri Sep 10 2004
! NVRAM config last updated at 00:45:48 UTC Fri Sep 10 2004
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R-1721-A
!
boot-start-marker
boot-end-marker
!
!
memory-size iomem 15
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
no aaa new-model
ip subnet-zero
ip cef
!
!
!
ip audit po max-events 100
no ip domain lookup
no ftp-server write-enable
!
!
!
!

!--- Define Internet Key Exchange (IKE) policy.

crypto isakmp policy 10

!--- Specify the 256-bit AES as the !--- encryption algorithm within an IKE policy.

encr aes 256

!--- Specify that pre-shared key authentication is used.

authentication pre-share

!--- Specify the shared secret.

crypto isakmp key cisco123 address 10.48.66.146
!
!

!--- Define the IPSec transform set.

crypto ipsec transform-set aesset esp-aes 256 esp-sha-hmac
!

!--- Define crypto map entry name "aesmap" that will use !--- IKE to establish the security associations (SA).

crypto map aesmap 10 ipsec-isakmp

!--- Specify remote IPSec peer.

set peer 10.48.66.146

!--- Specify which transform sets !--- are allowed for this crypto map entry.

set transform-set aesset

!--- Name the access list that determines which traffic !--- should be protected by IPSec.

match address acl_vpn
!
!
!
interface ATM0
no ip address
shutdown
no atm ilmi-keepalive
dsl equipment-type CPE
dsl operating-mode GSHDSL symmetric annex A
dsl linerate AUTO
!
interface Ethernet0
ip address 192.168.100.1 255.255.255.0
ip nat inside
half-duplex
!
interface FastEthernet0
ip address 10.48.66.147 255.255.254.0
ip nat outside
speed auto

!--- Apply crypto map to the interface.

crypto map aesmap
!
ip nat inside source list acl_nat interface FastEthernet0 overload
ip classless
ip route 0.0.0.0 0.0.0.0 10.48.66.1
ip route 192.168.200.0 255.255.255.0 FastEthernet0
no ip http server
no ip http secure-server
!

ip access-list extended acl_nat

!--- Exclude protected traffic from being NAT'ed.

deny ip 192.168.100.0 0.0.0.255 192.168.200.0 0.0.0.255
permit ip 192.168.100.0 0.0.0.255 any

!--- Access list that defines traffic protected by IPSec.

ip access-list extended acl_vpn
permit ip 192.168.100.0 0.0.0.255 192.168.200.0 0.0.0.255
!
!
line con 0
exec-timeout 0 0
line aux 0
line vty 0 4
!
end

R-1721-A#

Router 1721-B
R-1721-B#show run Building configuration... Current configuration : 1492 bytes ! ! Last configuration change at 14:11:41 UTC Wed Sep 8 2004 ! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname R-1721-B ! boot-start-marker boot-end-marker ! ! memory-size iomem 15 mmi polling-interval 60 no mmi auto-configure no mmi pvc mmi snmp-timeout 180 no aaa new-model ip subnet-zero ip cef ! ! ! ip audit po max-events 100 no ip domain lookup no ftp-server write-enable ! ! ! ! ! !--- Define IKE policy. crypto isakmp policy 10 !--- Specify the 256-bit AES as the !--- encryption algorithm within an IKE policy. encr aes 256 !--- Specify that pre-shared key authentication is used. authentication pre-share !--- Specify the shared secret. crypto isakmp key cisco123 address 10.48.66.147 ! ! !--- Define the IPSec transform set. crypto ipsec transform-set aesset esp-aes 256 esp-sha-hmac ! !--- Define crypto map entry name "aesmap" that uses !--- IKE to establish the SA. crypto map aesmap 10 ipsec-isakmp !--- Specify remote IPSec peer. set peer 10.48.66.147 !--- Specify which transform sets !--- are allowed for this crypto map entry. set transform-set aesset !--- Name the access list that determines which traffic !--- should be protected by IPSec. match address acl_vpn ! ! ! interface Ethernet0 ip address 192.168.200.1 255.255.255.0 ip nat inside half-duplex ! interface FastEthernet0 ip address 10.48.66.146 255.255.254.0 ip nat outside speed auto !--- Apply crypto map to the interface. crypto map aesmap ! ip nat inside source list acl_nat interface FastEthernet0 overload ip classless ip route 0.0.0.0 0.0.0.0 10.48.66.1 ip route 192.168.100.0 255.255.255.0 FastEthernet0 no ip http server no ip http secure-server ! ip access-list extended acl_nat !--- Exclude protected traffic from being NAT'ed. deny ip 192.168.200.0 0.0.0.255 192.168.100.0 0.0.0.255 permit ip 192.168.200.0 0.0.0.255 any !--- Access list that defines traffic protected by IPSec. ip access-list extended acl_vpn permit ip 192.168.200.0 0.0.0.255 192.168.100.0 0.0.0.255 ! ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 ! end R-1721-B#

Router 1721-B

R-1721-B#show run
Building configuration...

Current configuration : 1492 bytes
!
! Last configuration change at 14:11:41 UTC Wed Sep 8 2004
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R-1721-B
!
boot-start-marker
boot-end-marker
!
!
memory-size iomem 15
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
no aaa new-model
ip subnet-zero
ip cef
!
!
!
ip audit po max-events 100
no ip domain lookup
no ftp-server write-enable
!
!
!
! 
!

!--- Define IKE policy.

crypto isakmp policy 10

!--- Specify the 256-bit AES as the !--- encryption algorithm within an IKE policy.

 encr aes 256

!--- Specify that pre-shared key authentication is used.

 authentication pre-share


!--- Specify the shared secret.

crypto isakmp key cisco123 address 10.48.66.147
!
!

!--- Define the IPSec transform set.

crypto ipsec transform-set aesset esp-aes 256 esp-sha-hmac 
!

!--- Define crypto map entry name "aesmap" that uses !--- IKE to establish the SA.

crypto map aesmap 10 ipsec-isakmp 

!--- Specify remote IPSec peer.

 set peer 10.48.66.147

!--- Specify which transform sets !--- are allowed for this crypto map entry.

 set transform-set aesset 

!--- Name the access list that determines which traffic !--- should be protected by IPSec.

 match address acl_vpn
!
!
!
interface Ethernet0
 ip address 192.168.200.1 255.255.255.0
 ip nat inside
 half-duplex
!
interface FastEthernet0
 ip address 10.48.66.146 255.255.254.0
 ip nat outside
 speed auto

!--- Apply crypto map to the interface.

 crypto map aesmap
!
ip nat inside source list acl_nat interface FastEthernet0 overload
ip classless
ip route 0.0.0.0 0.0.0.0 10.48.66.1
ip route 192.168.100.0 255.255.255.0 FastEthernet0
no ip http server
no ip http secure-server
!
ip access-list extended acl_nat

!--- Exclude protected traffic from being NAT'ed.

 deny   ip 192.168.200.0 0.0.0.255 192.168.100.0 0.0.0.255
 permit ip 192.168.200.0 0.0.0.255 any



!--- Access list that defines traffic protected by IPSec.

ip access-list extended acl_vpn
 permit ip 192.168.200.0 0.0.0.255 192.168.100.0 0.0.0.255
!
!
line con 0
 exec-timeout 0 0
line aux 0
line vty 0 4
!
end

R-1721-B#

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.

show crypto isakmp sa—Muestra el estado de la Asociación de seguridad en Internet y el Protocolo de administración de claves (ISAKMP) SA.

Router 1721-A
R-1721-A#show crypto isakmp sa dst src state conn-id slot 10.48.66.147 10.48.66.146 QM_IDLE 1 0

Router 1721-B
R-1721-B#show crypto isakmp sa dst src state conn-id slot 10.48.66.147 10.48.66.146 QM_IDLE 1 0

show crypto ipsec sa — Muestra las estadísticas en los túneles activos.

Router 1721-A
R-1721-A#show crypto ipsec sa interface: FastEthernet0 Crypto map tag: aesmap, local addr. 10.48.66.147 protected vrf: local ident (addr/mask/prot/port): (192.168.100.0/255.255.255.0/0/0) remote ident (addr/mask/prot/port): (192.168.200.0/255.255.255.0/0/0) current_peer: 10.48.66.146:500 PERMIT, flags={origin_is_acl,} #pkts encaps: 30, #pkts encrypt: 30, #pkts digest 30 #pkts decaps: 30, #pkts decrypt: 30, #pkts verify 30 #pkts compressed: 0, #pkts decompressed: 0 #pkts not compressed: 0, #pkts compr. failed: 0 #pkts not decompressed: 0, #pkts decompress failed: 0 #send errors 0, #recv errors 0 local crypto endpt.: 10.48.66.147, remote crypto endpt.: 10.48.66.146 path mtu 1500, ip mtu 1500, ip mtu idb FastEthernet0 current outbound spi: 2EB0BA1A inbound esp sas: spi: 0xFECA28BC(4274661564) transform: esp-256-aes esp-sha-hmac , in use settings ={Tunnel, } slot: 0, conn id: 2000, flow_id: 1, crypto map: aesmap sa timing: remaining key lifetime (k/sec): (4554237/2895) IV size: 16 bytes replay detection support: Y inbound ah sas: inbound pcp sas: outbound esp sas: spi: 0x2EB0BA1A(783333914) transform: esp-256-aes esp-sha-hmac , in use settings ={Tunnel, } slot: 0, conn id: 2001, flow_id: 2, crypto map: aesmap sa timing: remaining key lifetime (k/sec): (4554237/2894) IV size: 16 bytes replay detection support: Y outbound ah sas: outbound pcp sas: R-1721-A#

Router 1721-A

R-1721-A#show crypto ipsec sa

interface: FastEthernet0
    Crypto map tag: aesmap, local addr. 10.48.66.147

   protected vrf: 
   local  ident (addr/mask/prot/port): (192.168.100.0/255.255.255.0/0/0)
   remote ident (addr/mask/prot/port): (192.168.200.0/255.255.255.0/0/0)
   current_peer: 10.48.66.146:500
     PERMIT, flags={origin_is_acl,}
    #pkts encaps: 30, #pkts encrypt: 30, #pkts digest 30
    #pkts decaps: 30, #pkts decrypt: 30, #pkts verify 30
    #pkts compressed: 0, #pkts decompressed: 0
    #pkts not compressed: 0, #pkts compr. failed: 0
    #pkts not decompressed: 0, #pkts decompress failed: 0
    #send errors 0, #recv errors 0

     local crypto endpt.: 10.48.66.147, remote crypto endpt.: 10.48.66.146
     path mtu 1500, ip mtu 1500, ip mtu idb FastEthernet0
     current outbound spi: 2EB0BA1A

     inbound esp sas:
      spi: 0xFECA28BC(4274661564)
        transform: esp-256-aes esp-sha-hmac ,
        in use settings ={Tunnel, }
        slot: 0, conn id: 2000, flow_id: 1, crypto map: aesmap
        sa timing: remaining key lifetime (k/sec): (4554237/2895)
        IV size: 16 bytes
        replay detection support: Y

     inbound ah sas:

     inbound pcp sas:

     outbound esp sas:
      spi: 0x2EB0BA1A(783333914)
        transform: esp-256-aes esp-sha-hmac ,
        in use settings ={Tunnel, }
        slot: 0, conn id: 2001, flow_id: 2, crypto map: aesmap
        sa timing: remaining key lifetime (k/sec): (4554237/2894)
        IV size: 16 bytes
        replay detection support: Y

     outbound ah sas:

     outbound pcp sas:
R-1721-A#

Router 1721-B
R-1721-B#show crypto ipsec sa interface: FastEthernet0 Crypto map tag: aesmap, local addr. 10.48.66.146 protected vrf: local ident (addr/mask/prot/port): (192.168.200.0/255.255.255.0/0/0) remote ident (addr/mask/prot/port): (192.168.100.0/255.255.255.0/0/0) current_peer: 10.48.66.147:500 PERMIT, flags={origin_is_acl,} #pkts encaps: 30, #pkts encrypt: 30, #pkts digest 30 #pkts decaps: 30, #pkts decrypt: 30, #pkts verify 30 #pkts compressed: 0, #pkts decompressed: 0 #pkts not compressed: 0, #pkts compr. failed: 0 #pkts not decompressed: 0, #pkts decompress failed: 0 #send errors 5, #recv errors 0 local crypto endpt.: 10.48.66.146, remote crypto endpt.: 10.48.66.147 path mtu 1500, ip mtu 1500, ip mtu idb FastEthernet0 current outbound spi: FECA28BC inbound esp sas: spi: 0x2EB0BA1A(783333914) transform: esp-256-aes esp-sha-hmac , in use settings ={Tunnel, } slot: 0, conn id: 2000, flow_id: 1, crypto map: aesmap sa timing: remaining key lifetime (k/sec): (4583188/2762) IV size: 16 bytes replay detection support: Y inbound ah sas: inbound pcp sas: outbound esp sas: spi: 0xFECA28BC(4274661564) transform: esp-256-aes esp-sha-hmac , in use settings ={Tunnel, } slot: 0, conn id: 2001, flow_id: 2, crypto map: aesmap sa timing: remaining key lifetime (k/sec): (4583188/2761) IV size: 16 bytes replay detection support: Y outbound ah sas: outbound pcp sas: R-1721-B#

Router 1721-B

R-1721-B#show crypto ipsec sa

interface: FastEthernet0
    Crypto map tag: aesmap, local addr. 10.48.66.146

   protected vrf: 
   local  ident (addr/mask/prot/port): (192.168.200.0/255.255.255.0/0/0)
   remote ident (addr/mask/prot/port): (192.168.100.0/255.255.255.0/0/0)
   current_peer: 10.48.66.147:500
     PERMIT, flags={origin_is_acl,}
    #pkts encaps: 30, #pkts encrypt: 30, #pkts digest 30
    #pkts decaps: 30, #pkts decrypt: 30, #pkts verify 30
    #pkts compressed: 0, #pkts decompressed: 0
    #pkts not compressed: 0, #pkts compr. failed: 0
    #pkts not decompressed: 0, #pkts decompress failed: 0
    #send errors 5, #recv errors 0

     local crypto endpt.: 10.48.66.146, remote crypto endpt.: 10.48.66.147
     path mtu 1500, ip mtu 1500, ip mtu idb FastEthernet0
     current outbound spi: FECA28BC

     inbound esp sas:
      spi: 0x2EB0BA1A(783333914)
        transform: esp-256-aes esp-sha-hmac ,
        in use settings ={Tunnel, }
        slot: 0, conn id: 2000, flow_id: 1, crypto map: aesmap
        sa timing: remaining key lifetime (k/sec): (4583188/2762)
        IV size: 16 bytes
        replay detection support: Y

     inbound ah sas:

     inbound pcp sas:

     outbound esp sas:
      spi: 0xFECA28BC(4274661564)
        transform: esp-256-aes esp-sha-hmac ,
        in use settings ={Tunnel, }
        slot: 0, conn id: 2001, flow_id: 2, crypto map: aesmap
        sa timing: remaining key lifetime (k/sec): (4583188/2761)
        IV size: 16 bytes
        replay detection support: Y

     outbound ah sas:

     outbound pcp sas:
R-1721-B#

show crypto engine connections active—Muestra el total de cifrados/descifrados por SA.

Router 1721-A
R-1721-A#show crypto engine connections active ID Interface IP-Address State Algorithm Encrypt Decrypt 1 FastEthernet0 10.48.66.147 set HMAC_SHA+AES_256_C 0 0 2000 FastEthernet0 10.48.66.147 set HMAC_SHA+AES_256_C 0 30 2001 FastEthernet0 10.48.66.147 set HMAC_SHA+AES_256_C 30 0

Router 1721-A

R-1721-A#show crypto engine connections active 

  ID Interface       IP-Address      State  Algorithm           Encrypt  Decrypt
   1 FastEthernet0   10.48.66.147    set    HMAC_SHA+AES_256_C        0        0
2000 FastEthernet0   10.48.66.147    set    HMAC_SHA+AES_256_C        0       30
2001 FastEthernet0   10.48.66.147    set    HMAC_SHA+AES_256_C       30        0

Router 1721-B
R-1721-B#show crypto engine connections active ID Interface IP-Address State Algorithm Encrypt Decrypt 1 FastEthernet0 10.48.66.146 set HMAC_SHA+AES_256_C 0 0 2000 FastEthernet0 10.48.66.146 set HMAC_SHA+AES_256_C 0 30 2001 FastEthernet0 10.48.66.146 set HMAC_SHA+AES_256_C 30 0

Router 1721-B

R-1721-B#show crypto engine connections active 

  ID Interface       IP-Address      State  Algorithm           Encrypt  Decrypt
   1 FastEthernet0   10.48.66.146    set    HMAC_SHA+AES_256_C        0        0
2000 FastEthernet0   10.48.66.146    set    HMAC_SHA+AES_256_C        0       30
2001 FastEthernet0   10.48.66.146    set    HMAC_SHA+AES_256_C       30        0

Troubleshoot

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

Comandos para resolución de problemas

Nota: Antes de ejecutar los comandos debug, consulte Información Importante sobre Comandos Debug.

debug crypto ipsec — Muestra eventos de IPSec.
debug crypto isakmp — Muestra mensajes acerca de eventos IKE.
debug crypto engine — Muestra información del motor de criptografía.

Puede encontrar información adicional sobre la resolución de problemas de IPSec en Resolución de problemas de seguridad IP – Introducción y uso de los comandos de depuración.