Configuración de VPN Multipunto Dinámica Usando GRE sobre IPSec con EIGRP, NAT y CBAC
Contenido
Introducción
Este documento ofrece un ejemplo de configuración de una VPN multipunto dinámica (DMVPN) para el concentrador y el radio utilizando la encapsulación de ruteo genérico (GRE) sobre IPSec con el Protocolo de ruteo de gateway interior mejorado (EIGRP), la Traducción de dirección de red (NAT) y el Control de acceso basado en contexto (CBAC).
Prerequisites
Requirements
Antes de que un GRE multipunto (mGRE) y un túnel IPSec puedan establecerse, deberá definir una política de intercambio de claves de Internet (IKE) mediante el comando crypto isakmp policy.
Nota: Para encontrar información adicional sobre los comandos usados en este documento, utilice la Command Lookup Tool (sólo clientes registrados) .
Componentes Utilizados
La información que contiene este documento se basa en las siguientes versiones de software y hardware.
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Cisco IOS® Software Release 12.2(15)T1 en el router hub y 12.3(1.6) en los routers radiales
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Cisco 3620 como router de eje de conexión, dos routers Cisco 1720 y un router Cisco 3620 como routers radiales
La información que se presenta en este documento se originó a partir de dispositivos dentro de un ambiente de laboratorio específico. All of the devices used in this document started with a cleared (default) configuration. Si la red está funcionando, asegúrese de haber comprendido el impacto que puede tener un comando antes de ejecutarlo.
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 usados en este documento, utilice la Command Lookup Tool (sólo clientes registrados) .
Diagrama de la red
Este documento utiliza la instalación de red que se muestra en el siguiente diagrama.
Configuraciones
Este documento usa las configuraciones detalladas a continuación.
| Concentrador - 3620-B |
|---|
3620-B#write terminal Building configuration... Current configuration : 2607 bytes ! version 12.2 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname 3620-B ! logging queue-limit 100 ! memory-size iomem 10 ip subnet-zero ! ! ip cef no ip domain lookup ! !--- This is the CBAC configuration and what to inspect. !--- This will be applied outbound on the external interface. ip inspect name in2out rcmd ip inspect name in2out ftp ip inspect name in2out tftp ip inspect name in2out tcp timeout 43200 ip inspect name in2out http ip inspect name in2out udp ip audit po max-events 100 ! ! ! !--- Create an Internet Security Association and Key Management !--- Protocol (ISAKMP) policy for Phase 1 negotiations. ! crypto isakmp policy 5 authentication pre-share group 2 !--- Add dynamic pre-shared key. !--- Here "dmvpn" is the word that is used as the key. crypto isakmp key dmvpnkey address 0.0.0.0 0.0.0.0 crypto isakmp nat keepalive 20 ! ! !--- Create the Phase 2 policy for actual data encryption. crypto ipsec transform-set dmvpnset esp-3des esp-sha-hmac ! !--- Create an IPSec profile to be applied dynamically !--- to the GRE over IPSec tunnels. crypto ipsec profile dmvpnprof set transform-set dmvpnset ! ! no voice hpi capture buffer no voice hpi capture destination ! ! mta receive maximum-recipients 0 ! ! !--- This is the inside interface. interface Loopback1 ip address 192.168.117.1 255.255.255.0 ip nat inside ! !--- This is the mGRE interface for dynamic GRE tunnels. interface Tunnel1 description MULTI-POINT GRE TUNNEL for BRANCHES bandwidth 1000 ip address 172.16.0.1 255.255.255.0 no ip redirects ip mtu 1400 ip nhrp authentication dmvpn ip nhrp map multicast dynamic ip nhrp network-id 99 ip nhrp holdtime 300 no ip split-horizon eigrp 1 no ip mroute-cache delay 1000 tunnel source FastEthernet0/0 tunnel mode gre multipoint tunnel key 100000 tunnel protection ipsec profile dmvpnprof ! !--- This is the outside interface. interface FastEthernet0/0 ip address 14.24.117.1 255.255.0.0 ip nat outside ip access-group 100 in ip inspect in2out out no ip mroute-cache duplex auto speed auto ! interface Serial0/0 no ip address shutdown clockrate 2000000 no fair-queue ! interface FastEthernet0/1 no ip address no ip mroute-cache duplex auto speed auto ! !--- Enable a routing protocol to send/receive dynamic !--- updates about the private networks over the tunnels. router eigrp 1 network 172.16.0.0 0.0.0.255 network 192.168.117.0 no auto-summary ! !--- Perform NAT on local traffic !--- going directly out FastEthernet0/0. ip nat inside source list 110 interface FastEthernet0/0 overload ip http server no ip http secure-server ip classless ip route 0.0.0.0 0.0.0.0 14.24.1.1 ip route 2.0.0.0 255.0.0.0 14.24.121.1 ! ! ! !--- Allow ISAKMP, ESP, and GRE traffic inbound. !--- CBAC will open other inbound access as needed. access-list 100 permit udp any host 14.24.117.1 eq 500 access-list 100 permit esp any host 14.24.117.1 access-list 100 permit gre any host 14.24.117.1 access-list 100 deny ip any any access-list 110 permit ip 192.168.117.0 0.0.0.255 any ! ! call rsvp-sync ! ! mgcp profile default ! dial-peer cor custom ! ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! ! end 3620-B# |
| Spoke 1 - 3620-A |
|---|
3620-A#write terminal Building configuration... Current configuration : 2559 bytes ! version 12.2 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname 3620-A ! boot system flash slot0:c3620-ik9o3s7-mz.122-15.T1.bin logging queue-limit 100 ! memory-size iomem 15 ip subnet-zero ! ! ip cef no ip domain lookup ! !--- This is the CBAC configuration and what to inspect. !--- This will be applied outbound on the external interface. ip inspect name in2out rcmd ip inspect name in2out tftp ip inspect name in2out udp ip inspect name in2out tcp timeout 43200 ip inspect name in2out realaudio ip inspect name in2out vdolive ip inspect name in2out netshow ip audit po max-events 100 ! ! ! !--- Create an ISAKMP policy for !--- Phase 1 negotiations. crypto isakmp policy 5 authentication pre-share group 2 !--- Add dynamic pre-shared key. crypto isakmp key dmvpnkey address 0.0.0.0 0.0.0.0 ! ! !--- Create the Phase 2 policy for actual data encryption. crypto ipsec transform-set dmvpnset esp-3des esp-sha-hmac ! !--- Create an IPSec profile to be applied dynamically !--- to the GRE over IPSec tunnels. crypto ipsec profile dmvpnprof set transform-set dmvpnset ! ! no voice hpi capture buffer no voice hpi capture destination ! ! mta receive maximum-recipients 0 ! ! !--- This is the inside interface. interface Loopback1 ip address 192.168.118.1 255.255.255.0 ip nat inside ! !--- This is the mGRE interface for dynamic GRE tunnels. interface Tunnel1 description HOST DYNAMIC TUNNEL bandwidth 1000 ip address 172.16.0.2 255.255.255.0 no ip redirects ip mtu 1400 ip nhrp authentication dmvpn ip nhrp map 172.16.0.1 14.24.117.1 ip nhrp map multicast 14.24.117.1 ip nhrp network-id 99 ip nhrp holdtime 300 ip nhrp nhs 172.16.0.1 no ip mroute-cache delay 1000 tunnel source Ethernet0/0 tunnel mode gre multipoint tunnel key 100000 tunnel protection ipsec profile dmvpnprof ! !--- This is the outside interface. interface Ethernet0/0 ip address 14.24.118.1 255.255.0.0 ip nat outside ip inspect in2out out ip access-group 100 in no ip mroute-cache half-duplex ! interface Ethernet0/1 no ip address half-duplex ! interface Ethernet0/2 no ip address shutdown half-duplex ! interface Ethernet0/3 no ip address shutdown half-duplex ! !--- Enable a routing protocol to send/receive dynamic !--- updates about the private networks over the tunnel. router eigrp 1 network 172.16.0.0 0.0.0.255 network 192.168.118.0 no auto-summary ! !--- Perform NAT on local traffic !--- going directly out Ethernet0/0. ip nat inside source list 110 interface Ethernet0/0 overload ip http server no ip http secure-server ip classless ip route 0.0.0.0 0.0.0.0 14.24.1.1 ! ! !--- Allow ISAKMP, ESP, and GRE traffic inbound. !--- CBAC will open inbound access as needed. access-list 100 permit udp any host 14.24.118.1 eq 500 access-list 100 permit esp any host 14.24.118.1 access-list 100 permit gre any host 14.24.118.1 access-list 100 deny ip any any access-list 110 permit ip 192.168.118.0 0.0.0.255 any ! ! call rsvp-sync ! ! mgcp profile default ! dial-peer cor custom ! ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! ! end 3620-A# |
| Spoke 2 - 1720-b |
|---|
1720-b#write terminal Building configuration... Current configuration : 2543 bytes ! version 12.2 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname 1720-b ! boot system flash flash:c1700-ny-mz.122-8.YJ logging queue-limit 100 enable password cisco ! username 7206-B password 0 cisco ip subnet-zero ! ! no ip domain lookup ! ip cef !--- This is the CBAC configuration and what to inspect. !--- This will be applied outbound on the external interface. ip inspect name in2out rcmd ip inspect name in2out tftp ip inspect name in2out udp ip inspect name in2out tcp timeout 43200 ip inspect name in2out realaudio ip inspect name in2out vdolive ip inspect name in2out netshow ip audit po max-events 100 ! ! vpdn-group 1 request-dialin protocol pppoe ! ! !--- Create an ISAKMP policy for !--- Phase 1 negotiations. crypto isakmp policy 5 authentication pre-share group 2 !--- Add dynamic pre-shared key. crypto isakmp key dmvpnkey address 0.0.0.0 0.0.0.0 ! ! !--- Create the Phase 2 policy for actual data encryption. crypto ipsec transform-set dmvpnset esp-3des esp-sha-hmac ! !--- Create an IPSec profile to be applied dynamically !--- to the GRE over IPSec tunnels. crypto ipsec profile dmvpnprof set transform-set dmvpnset ! ! !--- This is the inside interface. interface Loopback1 ip address 192.168.116.1 255.255.255.0 ip nat inside ! !--- This is the mGRE interface for dynamic GRE tunnels. interface Tunnel1 description HOST DYNAMIC TUNNEL bandwidth 1000 ip address 172.16.0.3 255.255.255.0 no ip redirects ip mtu 1400 ip nhrp authentication dmvpn ip nhrp map 172.16.0.1 14.24.117.1 ip nhrp map multicast 14.24.117.1 ip nhrp network-id 99 ip nhrp holdtime 300 ip nhrp nhs 172.16.0.1 no ip mroute-cache delay 1000 tunnel source Dialer1 tunnel mode gre multipoint tunnel key 100000 tunnel protection ipsec profile dmvpnprof ! interface Ethernet0 no ip address half-duplex ! interface FastEthernet0 no ip address no ip mroute-cache speed auto pppoe enable pppoe-client dial-pool-number 1 ! !--- This is the outside interface. interface Dialer1 ip address 2.2.2.10 255.255.255.0 ip inspect in2out out ip access-group 100 in encapsulation ppp dialer pool 1 dialer-group 1 ppp authentication pap chap callin ! !--- Enable a routing protocol to send/receive dynamic !--- updates about the private networks. router eigrp 1 network 172.16.0.0 0.0.0.255 network 192.168.116.0 no auto-summary ! !--- Perform NAT on local traffic !--- going directly out Dialer1. ip nat inside source list 110 interface Dialer1 overload ip classless ip route 0.0.0.0 0.0.0.0 Dialer1 no ip http server no ip http secure-server ! ! ! !--- Allow ISAKMP, ESP, and GRE traffic inbound. !--- CBAC will open inbound access as needed. access-list 100 permit udp any host 14.24.116.1 eq 500 access-list 100 permit esp any host 14.24.116.1 access-list 100 permit gre any host 14.24.116.1 access-list 100 deny ip any any access-list 110 permit ip 192.168.116.0 0.0.0.255 any dialer-list 1 protocol ip permit ! ! ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! no scheduler allocate end 1720-b# |
| Spoke 3 – 1720-A |
|---|
1720-A#write terminal Building configuration... Current configuration : 1770 bytes ! version 12.2 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname 1720-A ! logging queue-limit 100 ! memory-size iomem 25 ip subnet-zero ! ! ! ip cef !--- This is the CBAC configuration and what to inspect. !--- This will be applied outbound on the external interface. ip inspect name in2out rcmd ip inspect name in2out tftp ip inspect name in2out udp ip inspect name in2out tcp timeout 43200 ip inspect name in2out realaudio ip inspect name in2out vdolive ip inspect name in2out netshow ip audit po max-events 100 ! ! !--- Create an ISAKMP policy for !--- Phase 1 negotiations. crypto isakmp policy 5 authentication pre-share group 2 !--- Add dynamic pre-shared key. crypto isakmp key dmvpnkey address 0.0.0.0 0.0.0.0 ! ! !--- Create the Phase 2 policy for actual data encryption. crypto ipsec transform-set dmvpnset esp-3des esp-sha-hmac ! !--- Create an IPSec profile to be applied dynamically !--- to the GRE over IPSec tunnels. crypto ipsec profile dmvpnprof set transform-set dmvpnset ! ! !--- This is the inside interface. interface Loopback1 ip address 192.168.120.1 255.255.255.0 ip nat inside ! !--- This is the mGRE interface for dynamic GRE tunnels. interface Tunnel1 description HOST DYNAMIC TUNNEL bandwidth 1000 ip address 172.16.0.4 255.255.255.0 no ip redirects ip mtu 1400 ip nhrp authentication dmvpn ip nhrp map 172.16.0.1 14.24.117.1 ip nhrp map multicast 14.24.117.1 ip nhrp network-id 99 ip nhrp holdtime 300 ip nhrp nhs 172.16.0.1 no ip mroute-cache delay 1000 tunnel source FastEthernet0 tunnel mode gre multipoint tunnel key 100000 tunnel protection ipsec profile dmvpnprof ! interface Ethernet0 no ip address no ip mroute-cache half-duplex ! !--- This is the outside interface. interface FastEthernet0 ip address 14.24.120.1 255.255.0.0 ip nat outside ip inspect in2out out ip access-group 100 in no ip mroute-cache speed auto ! !--- Enable a routing protocol to send/receive dynamic !--- updates about the private networks. router eigrp 1 network 172.16.0.0 0.0.0.255 network 192.168.120.0 no auto-summary ! !--- Perform NAT on local traffic !--- going directly out FastEthernet0. ip nat inside source list 110 interface FastEthernet0 overload ip classless ip route 0.0.0.0 0.0.0.0 14.24.1.1 no ip http server no ip http secure-server ! ! ! !--- Allow ISAKMP, ESP, and GRE traffic inbound. !--- CBAC will open inbound access as needed. access-list 100 permit udp any host 14.24.116.1 eq 500 access-list 100 permit esp any host 14.24.116.1 access-list 100 permit gre any host 14.24.116.1 access-list 100 deny ip any any access-list 110 permit ip 192.168.120.0 0.0.0.255 any ! ! ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! no scheduler allocate end 1720-A# |
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.
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show crypto isakmp sa: muestra el estado de la asociación de seguridad ISAKMP (SA).
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show crypto engine connections active: muestra los cifrados/descifrados totales por SA.
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show crypto ipsec sa — Muestra las estadísticas en los túneles activos.
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show ip route — Muestra la tabla de ruteo.
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show ip eigrp neighbor—Muestra los vecinos EIGRP.
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show ip nhrp — Muestra la memoria caché del Protocolo de resolución de salto siguiente (NHRP) de IP, opcionalmente limitado a entradas de caché estáticas o dinámicas para un determinada interfaz.
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show crypto socket—Muestra la tabla de zócalo de criptografía entre NHRP e IPSec.
Troubleshoot
En esta sección encontrará información que puede utilizar para solucionar problemas de configuración.
Comandos para resolución de problemas
Nota: Antes de ejecutar comandos debug, consulte Información Importante sobre Comandos Debug.
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debug crypto ipsec — Muestra eventos de IPSec.
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debug crypto isakmp — Muestra mensajes acerca de eventos IKE.
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debug crypto engine — Muestra información del motor de criptografía.
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debug crypto socket—Muestra información sobre la tabla de zócalo entre NHRP e IPSec.
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debug nhrp packet—Muestra información sobre paquetes NHRP.
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debug nhrp packet—Muestra información sobre paquetes NHRP.
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debug tunnel protection—Muestra información acerca de los túneles GRE dinámicos.
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.
Información Relacionada
Historial de revisiones
| Revisión | Fecha de publicación | Comentarios |
|---|---|---|
1.0 |
14-Jan-2008 |
Versión inicial |
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