Het configureren van dynamisch multipoint VPN met GRE via IPSec met DHCP, NAT en CBAC
Inhoud
Inleiding
Dit document biedt een voorbeeldconfiguratie voor Hub and-Spoke Dynamic Multipoint VPN (DMVPN) met behulp van generieke Routing Encapsulation (GRE) via IPSec met Enhanced Interior Gateway Routing Protocol (DHCP), Network Address Translation (NAT) en Context-Based Access Control (CBAC).
Voorwaarden
Vereisten
Voordat u een GRE-tunnel (mGRE) met meerdere punten en een IPSec-tunnel kunt realiseren, moet u een IKE-beleid (Internet Key Exchange) definiëren via de opdracht crypto-isakmp-beleid.
N.B.: Als u aanvullende informatie wilt vinden over de opdrachten in dit document, gebruikt u het Opdrachtplanningprogramma (alleen geregistreerd klanten).
Gebruikte componenten
De informatie in dit document is gebaseerd op de volgende software- en hardware-versies:
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Cisco IOS® softwarerelease 12.2(15)T1 op de router van het hub en 12.3(1.6) op de gemaakte routers
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Cisco 3620 als hubrouter, twee Cisco 1720 routers en één Cisco 3620 router zoals spraakrouters
De informatie in dit document is gebaseerd op apparaten in een specifieke laboratoriumomgeving. Alle apparaten die in dit document worden beschreven, hadden een opgeschoonde (standaard)configuratie. Als u in een levend netwerk werkt, zorg er dan voor dat u de potentiële impact van om het even welke opdracht begrijpt alvorens het te gebruiken.
Conventies
Raadpleeg voor meer informatie over documentconventies de technische Tips van Cisco.
Configureren
Deze sectie bevat informatie over het configureren van de functies die in dit document worden beschreven.
N.B.: Als u aanvullende informatie wilt vinden over de opdrachten in dit document, gebruikt u het Opdrachtplanningprogramma (alleen geregistreerd klanten).
Netwerkdiagram
Dit document gebruikt de netwerkinstellingen die in het onderstaande schema zijn weergegeven.
Configuraties
Dit document maakt gebruik van de onderstaande configuraties.
| Hub 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# |
Verifiëren
Deze sectie verschaft informatie die u kunt gebruiken om te bevestigen dat uw configuratie correct werkt.
Bepaalde opdrachten met show worden ondersteund door de tool Output Interpreter (alleen voor geregistreerde klanten). Hiermee kunt u een analyse van de output van opdrachten met show genereren.
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toon crypto isakmp sa-Toont de staat voor de ISAKMP security association (SA).
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tonen de cryptomotorverbindingen actief — Geeft de totale versleuteling/decrypts per SA weer.
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Laat crypto ipsec sa-displays de statistieken op de actieve tunnels zien.
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toon ip route-Toont de routingtabel.
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toon ip eigrp buurman-toont de buren EurEur.
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toon ip Nhrp-Toont het IP Next Hop Resolutie Protocol (NHRP) cache, optioneel beperkt tot dynamische of statische cache items voor een specifieke interface.
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toon crypto socket-displays de crypto socket tabel tussen NHRP en IPSec.
Problemen oplossen
Deze sectie bevat informatie waarmee u problemen met de configuratie kunt oplossen.
Opdrachten voor troubleshooting
Opmerking: Voordat u debug-opdrachten afgeeft, raadpleegt u Belangrijke informatie over debug-opdrachten.
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debug van crypto ipsec-displays IPSec-gebeurtenissen.
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debug van crypto isakmp-displays over IKE gebeurtenissen.
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debug van crypto motor—informatie van de crypto motor.
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debug crypto socket-displays over de socket tabel tussen NHRP en IPSec.
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debug nhrp-displays informatie over NHRP gebeurtenissen.
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debug Nhrp pakket-displays informatie over NHRP-pakketten.
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debug van tunnelbeveiliging: informatie over dynamische GRE-tunnels.
Aanvullende informatie over het oplossen van IPSec kan worden gevonden bij IP security probleemoplossing - het begrip en het gebruik van debug-opdrachten.
Gerelateerde informatie
Revisiegeschiedenis
| Revisie | Publicatiedatum | Opmerkingen |
|---|---|---|
1.0 |
14-Jan-2008 |
Eerste vrijgave |
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