Configuration VPN multipoint dynamique à l'aide de GRE sur IPsec avec OSPF, NAT et pare-feu Cisco IOS
Contenu
Introduction
Ce document fournit un exemple de configuration du VPN multipoint dynamique (DMVPN) par l'utilisation de l'Encapsulation de routage générique (GRE) pour IPsec avec l'Open Shortest Path First (OSPF), la Traduction d'adresses réseau (NAT), et le pare-feu Cisco IOS®.
Conditions préalables
Conditions requises
Avant d'établir un tunnel GRE (mGRE) multipoint et IPsec, vous devez définir une stratégie IKE (Internet Key Exchange) à l'aide de la commande crypto isakmp policy.
Remarque : utilisez l'outil de recherche de commandes (clients enregistrés uniquement) pour obtenir plus d'informations sur les commandes utilisées dans cette section.
Components Used
Les informations contenues dans ce document sont basées sur les versions de matériel et de logiciel suivantes :
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Logiciel Cisco IOS® Version 12.2(15)T1 sur le routeur concentrateur et Logiciel Cisco IOS Version 12.3(1.6) sur les routeurs en étoile
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Cisco 3620 comme routeur concentrateur, deux routeurs Cisco 1720 et un routeur Cisco 3620 comme routeur en étoile
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
Conventions
Pour plus d'informations sur les conventions utilisées dans ce document, reportez-vous à Conventions relatives aux conseils techniques Cisco.
Configuration
Cette section vous fournit des informations pour configurer les fonctionnalités décrites dans ce document.
Remarque : utilisez l'outil de recherche de commandes (clients enregistrés uniquement) pour obtenir plus d'informations sur les commandes utilisées dans cette section.
Diagramme du réseau
Ce document utilise cette configuration du réseau.
Configurations
Ce document utilise les configurations suivantes.
| Concentrateur - 3620-B |
|---|
W2N-6.16-3620-B#write terminal Building configuration... Current configuration : 2613 bytes ! version 12.2 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname W2N-6.16-3620-B ! logging queue-limit 100 ! memory-size iomem 10 ip subnet-zero ! ! ip cef no ip domain lookup ! !--- This is the Cisco IOS Firewall configuration and what to inspect. !--- This is 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. 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 inbound interface. interface Loopback1 ip address 192.168.117.1 255.255.255.0 ip nat inside ! !--- Create a GRE tunnel template to be applied !--- to all the dynamically created 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 1416 ip nhrp authentication dmvpn ip nhrp map multicast dynamic ip nhrp network-id 99 ip nhrp holdtime 300 no ip route-cache ip ospf network broadcast 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 outbound 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. router ospf 1 log-adjacency-changes network 172.16.0.0 0.0.0.255 area 0 network 192.168.117.0 0.0.0.255 area 0 ! !--- Except the private network traffic from the NAT process. ip nat inside source route-map nonat 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. !--- Cisco IOS Firewall opens other inbound access as needed. access-list 100 permit udp any host 14.24.117.1 eq 500 access-list 100 premit 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 !--- Except the private network traffic from the NAT process. access-list 110 deny ip 192.168.117.0 0.0.0.255 192.168.118.0 0.0.0.255 access-list 110 deny ip 192.168.117.0 0.0.0.255 192.168.116.0 0.0.0.255 access-list 110 deny ip 192.168.117.0 0.0.0.255 192.168.120.0 0.0.0.255 access-list 110 permit ip 192.168.117.0 0.0.0.255 any ! !--- Except the private network traffic from the NAT process. route-map nonat permit 10 match ip address 110 ! 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 W2N-6.16-3620-B# |
| Spoke 1 - 3620-A |
|---|
W2N-6.16-3620-A#write terminal Building configuration... Current configuration : 2678 bytes ! version 12.2 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname W2N-6.16-3620-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 Cisco IOS Firewall configuration and what to inspect. !--- This is 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 inbound interface. interface Loopback1 ip address 192.168.118.1 255.255.255.0 ip nat inside ! !--- Create a GRE tunnel template to be applied to !--- all the dynamically created 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 1416 ip nhrp authentication dmvpn ip nhrp map multicast dynamic 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 route-cache ip ospf network broadcast 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 outbound interface. interface Ethernet0/0 ip address 14.24.118.1 255.255.0.0 ip nat outside ip access-group 100 in ip inspect in2out out 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. router ospf 1 log-adjacency-changes redistribute connected network 172.16.0.0 0.0.0.255 area 0 network 192.168.118.0 0.0.0.255 area 0 ! !--- Except the private network traffic from the NAT process. ip nat inside source route-map nonat 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 ip route 2.0.0.0 255.0.0.0 14.24.121.1 ! ! ! !--- Allow ISAKMP, ESP, and GRE traffic inbound. !--- Cisco IOS Firewall opens inbound access as needed. access-list 100 permit udp any host 14.24.118.1 eq 500 access-list 100 premit 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 !--- Except the private network traffic from the NAT process. access-list 110 deny ip 192.168.118.0 0.0.0.255 192.168.117.0 0.0.0.255 access-list 110 deny ip 192.168.118.0 0.0.0.255 192.168.116.0 0.0.0.255 access-list 110 deny ip 192.168.118.0 0.0.0.255 192.168.120.0 0.0.0.255 access-list 110 permit ip 192.168.118.0 0.0.0.255 any ! !--- Except the private network traffic from the NAT process. route-map nonat permit 10 match ip address 110 ! 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 W2N-6.16-3620-A# |
| Spoke 2 - 1720-b |
|---|
1720-b#write terminal Building configuration... Current configuration : 2623 bytes ! version 12.2 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname 1720-b ! 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 Cisco IOS Firewall configuration and what to inspect. !--- This is 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 inbound interface. interface Loopback1 ip address 192.168.116.1 255.255.255.0 ip nat inside ! !--- Create a GRE tunnel template to be applied to !--- all the dynamically created 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 1416 ip nhrp authentication dmvpn ip nhrp map multicast dynamic 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 route-cache ip ospf network broadcast 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 outbound 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 ospf 1 log-adjacency-changes redistribute connected network 172.16.0.0 0.0.0.255 area 0 network 192.168.116.0 0.0.0.255 area 0 ! !--- Except the private network traffic from the NAT process. ip nat inside source route-map nonat interface Dialer1 overload ip classless ip route 0.0.0.0 0.0.0.0 14.24.1.1 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. !--- Cisco IOS Firewall opens inbound access as needed. access-list 100 permit udp any host 14.24.116.1 eq 500 access-list 100 premit 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 !--- Except the private network traffic from the NAT process. access-list 110 deny ip 192.168.116.0 0.0.0.255 192.168.117.0 0.0.0.255 access-list 110 deny ip 192.168.116.0 0.0.0.255 192.168.118.0 0.0.0.255 access-list 110 deny ip 192.168.116.0 0.0.0.255 192.168.120.0 0.0.0.255 access-list 110 permit ip 192.168.116.0 0.0.0.255 any dialer-list 1 protocol ip permit ! !--- Except the private network traffic from the NAT process. route-map nonat permit 10 match ip address 110 ! ! 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 |
|---|
W2N-6.16-1720-A#write terminal Building configuration... Current configuration : 2303 bytes ! version 12.2 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname W2N-6.16-1720-A ! logging queue-limit 100 ! memory-size iomem 25 ip subnet-zero ! ! no ip domain lookup ! ip cef !--- This is the Cisco IOS Firewall configuration and what to inspect. !--- This is 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 notify log 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 inbound interface. interface Loopback1 ip address 192.168.120.1 255.255.255.0 ip nat inside ! !--- Create a GRE tunnel template to be applied to !--- all the dynamically created 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 1416 ip nhrp authentication dmvpn ip nhrp map multicast dynamic 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 ip ospf network broadcast 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 outbound 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 ospf 1 log-adjacency-changes redistribute connected network 172.16.0.0 0.0.0.255 area 0 network 192.168.120.0 0.0.0.255 area 0 ! !--- Except the private network traffic from the NAT process. ip nat inside source route-map nonat interface FastEthernet0 overload 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 no ip http server no ip http secure-server ! ! ! !--- Allow ISAKMP, ESP, and GRE traffic inbound. !--- Cisco IOS Firewall opens inbound access as needed. access-list 100 permit udp any host 14.24.116.1 eq 500 access-list 100 premit 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 !--- Except the private network traffic from the NAT process. access-list 110 deny ip 192.168.120.0 0.0.0.255 192.168.116.0 0.0.0.255 access-list 110 deny ip 192.168.120.0 0.0.0.255 192.168.117.0 0.0.0.255 access-list 110 deny ip 192.168.120.0 0.0.0.255 192.168.118.0 0.0.0.255 access-list 110 permit ip 192.168.120.0 0.0.0.255 any ! !--- Except the private network traffic from the NAT process. route-map nonat permit 10 match ip address 110 ! ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! end W2N-6.16-1720-A# |
Vérification
Référez-vous à cette section pour vous assurer du bon fonctionnement de votre configuration.
L'Outil Interpréteur de sortie (clients enregistrés uniquement) (OIT) prend en charge certaines commandes show. Utilisez l'OIT pour afficher une analyse de la sortie de la commande show .
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show crypto isakmp sa : affiche l'état de l'association de sécurité ISAKMP (SA).
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show crypto engine connections active : affiche le nombre total de chiffrement/déchiffrement par SA.
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show crypto ipsec sa : affiche les statistiques sur les tunnels actifs.
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show ip route : affiche la table de routage.
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show ip ospf neighbor : affiche les informations de voisinage OSPF par interface.
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show ip nhrp - Affiche le cache NHRP (Next Hop Resolution Protocol) IP, éventuellement limité aux entrées de cache dynamique ou statique pour une interface spécifique.
Dépannage
Cette section fournit des informations que vous pouvez utiliser pour dépanner votre configuration.
Dépannage des commandes
Note : Reportez-vous à Informations importantes sur les commandes de débogage avant d'émettre des commandes de débogage.
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debug crypto ipsec — Affiche des événements IPsec.
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debug crypto isakmp—Affichage de messages d'événements IKE.
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debug crypto engine — Affiche des informations du moteur de chiffrement.
Vous trouverez les informations supplémentaires pour dépanner IPSec à la section Dépannage de sécurité IP - Présentation et utilisation des commandes de débogage.
Informations connexes
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