Configuración de GRE sobre IPSec entre un router del IOS de Cisco y un concentrador VPN 5000 usando RIP y CVC.
Contenido
Introducción
Este ejemplo de configuración describe cómo configurar la encapsulación de ruteo genérico (GRE) sobre IPSec entre un Cisco VPN 5000 Concentrator y un router Cisco IOS®. La función GRE sobre IPSec se introduce en la versión de software del VPN 5000 Concentrator 6.0(19).
El protocolo de información de enrutamiento (RIP) se utiliza como protocolo de enrutamiento dinámico en este ejemplo para enrutar el tráfico a través del túnel VPN.
Prerequisites
Requirements
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.
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Software Cisco IOS versión 12.1(5)T7
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Versión 6.0(19) del software del concentrador VPN 5000
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) .
Diagrama de la red
Este documento utiliza la configuración de red que se muestra en el siguiente diagrama.
GRE sobre IPSec se configura entre el router Cisco IOS (7140) y el concentrador Cisco VPN 5008. Detrás de estos dispositivos, se anuncian varias redes a través de RIP, que se ejecuta dentro del túnel GRE entre 7140 y VPN 5008.
Las redes detrás del Cisco 7140 son:
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10.31.0.0/17
Las redes detrás de VPN 5008 son:
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172.18.124.0.0/24
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20.20.20.0/24
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10.0.0.0/24
Configuraciones
Este documento usa las configuraciones detalladas aquí.
| Router del Cisco IOS |
|---|
Building configuration... Current configuration : 1607 bytes ! version 12.1 no service single-slot-reload-enable service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname 03-vpn-7140 ! boot system flash disk1:c7100-ik8s-mz.122-3 logging rate-limit console 10 except errors enable password <removed> ! ip subnet-zero ip cef ! ! no ip finger ! ! !--- Define phase 1 policy. crypto isakmp policy 10 authentication pre-share !--- Define the PreShared Key for the Remote peer !--- (5000 ) in this example. crypto isakmp key cisco123 address 10.32.1.161 ! !--- Define Phase 2 policy. !--- Make sure that Transport Mode is enabled. crypto ipsec transform-set www esp-des esp-sha-hmac mode transport ! !--- Define the crypto map that is later !--- applied on the outbound interface. crypto map temp 10 ipsec-isakmp set peer 10.32.1.161 set transform-set www match address 100 ! call rsvp-sync ! ! ! ! ! ! ! controller ISA 5/1 ! !--- Define the GRE tunnel on the router. !--- Tunnel source is the outbound interface !--- and tunnel destination is VPN 5000. interface Tunnel0 ip address 10.1.1.2 255.255.255.0 tunnel source FastEthernet0/0 tunnel destination 10.32.1.161 crypto map temp ! !--- Outbound Interface that is connected to the Internet. interface FastEthernet0/0 ip address 10.32.1.162 255.255.128.0 duplex auto speed auto crypto map temp ! ! !--- Inside interface. interface FastEthernet0/1 ip address 10.31.100.1 255.255.128.0 no keepalive duplex auto speed auto ! interface Serial1/0 no ip address shutdown framing c-bit cablelength 10 dsu bandwidth 44210 ! interface Serial1/1 no ip address shutdown framing c-bit cablelength 10 dsu bandwidth 44210 ! !--- Define RIP Routing Protocol on the router. !--- This example shows Version 2 for classless routing. router rip version 2 network 10.0.0.0 no auto-summary ! ip classless ip route 0.0.0.0 0.0.0.0 10.32.1.1 no ip http server ! !--- Encryption access-list that is used !--- to encrypt the GRE packets. access-list 100 permit gre host 10.32.1.162 host 10.32.1.161 ! ! line con 0 exec-timeout 0 0 transport input none line aux 0 line vty 5 15 ! end |
| Concentrador VPN 5000 |
|---|
show configuration Edited Configuration not Present, using Running [ IP Ethernet 0:0 ] SubnetMask = 255.255.255.0 IPAddress = 1.1.1.1 [ IP Ethernet 1:0 ]Mode = Routed SubnetMask = 255.255.128.0 IPAddress = 10.32.1.161 [ General ] VPNGateway = 10.32.1.1 EnablePassword = <removed> Password = <removed> EthernetAddress = 00:00:a5:e9:c8:00 DeviceType = VPN 5002/8 Concentrator ConfiguredOn = Timeserver not configured ConfiguredFrom = Command Line, from Console [ IKE Policy ] Protection = SHA_DES_G1 [ IP Static ] 0.0.0.0 0.0.0.0 10.32.1.1 1 redist=none [ Context List ] flash://rip.cfg [ Logging ] Enabled = On Level = 7 Configuration size is 822 out of 65500 bytes. VPN5002_8_A5E9C800: Main# |
| CVC |
|---|
show configuration Edited Configuration not Present, using Running [ General ] Context = "rip" [ IP Ethernet 1:0.1 ] VLANID = 124 Encapsulation = dot1q Mode = Routed SubnetMask = 255.255.255.0 IPAddress = 172.18.124.219 [ IP Static ] [ Tunnel Partner VPN 1 ] InactivityTimeout = 120 Transform = esp(sha,des) KeyManage = ReliablePeer = "10.31.0.0/17" LocalAccess = "10.5.1.0/24" SharedKey = "cisco123" Mode = Main TunnelType = GREinIPSec BindTo = "Ethernet 1:0" Partner = 10.32.1.162 [ IP VPN 1 ] RIPIn = On RIPOut = On RIPVersion = V2 DirectedBroadcast = Off Numbered = On Mode = Routed SubnetMask = 255.255.255.0 IPAddress = 10.1.1.1 [ IP Ethernet 1:0.2 ] Mode = Routed SubnetMask = 255.255.255.0 IPAddress = 20.20.20.20 Configuration size is 1127 out of 65500 bytes. VPN5002_8_A5E9C800: rip# |
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 ip route—Muestra el estado actual de la tabla de ruteo.
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show crypto engine connection active: muestra el contador de cifrado/descifrado de paquetes por asociación de seguridad IPSec.
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show crypto ipsec sa—Muestra todas las asociaciones de seguridad IPSec actuales.
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show system log buffer —Muestra información básica de syslog.
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vpn trace dump: muestra información detallada sobre los procesos de VPN.
03-vpn-7140#show ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is 10.32.1.1 to network 0.0.0.0 20.0.0.0/24 is subnetted, 1 subnets R 20.20.20.0 [120/1] via 10.1.1.1, 00:00:10, Tunnel0 172.18.0.0/16 is variably subnetted, 2 subnets, 2 masks R 172.18.124.0/24 [120/1] via 10.1.1.1, 00:00:10, Tunnel0 10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks R 10.0.0.0/24 [120/2] via 10.1.1.1, 00:00:10, Tunnel0 C 10.1.1.0/24 is directly connected, Tunnel0 C 10.31.0.0/17 is directly connected, FastEthernet0/1 C 10.32.0.0/17 is directly connected, FastEthernet0/0 S* 0.0.0.0/0 [1/0] via 10.32.1.1 03-vpn-7140#
03-vpn-7140#show crypto enggine connection active ID Interface IP-Address State Algorithm Encrypt Decrypt 3 FastEthernet0/0 10.32.1.162 set HMAC_SHA+DES_56_CB 0 0 4 FastEthernet0/0 10.32.1.162 set HMAC_SHA+DES_56_CB 0 0 5 FastEthernet0/0 10.32.1.162 set HMAC_SHA+DES_56_CB 0 0 2098 FastEthernet0/0 10.32.1.162 set HMAC_SHA+DES_56_CB 0 1892 2099 FastEthernet0/0 10.32.1.162 set HMAC_SHA+DES_56_CB 11552 0
03-vpn-7140#show crypto ipsec sa
interface: FastEthernet0/0
Crypto map tag: temp, local addr. 10.32.1.162
local ident (addr/mask/prot/port): (10.32.1.162/255.255.255.255/0/0)
remote ident (addr/mask/prot/port): (10.32.1.161/255.255.255.255/0/0)
current_peer: 10.32.1.161
PERMIT, flags={transport_parent,}
#pkts encaps: 0, #pkts encrypt: 0, #pkts digest 0
#pkts decaps: 0, #pkts decrypt: 0, #pkts verify 0
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts compr. failed: 0, #pkts decompress failed: 0
#send errors 0, #recv errors 0
local crypto endpt.: 10.32.1.162, remote crypto endpt.: 10.32.1.161
path mtu 1500, media mtu 1500
current outbound spi: 0
inbound esp sas:
inbound ah sas:
inbound pcp sas:
outbound esp sas:
outbound ah sas:
outbound pcp sas:
local ident (addr/mask/prot/port): (10.32.1.162/255.255.255.255/47/0)
remote ident (addr/mask/prot/port): (10.32.1.161/255.255.255.255/47/0)
current_peer: 10.32.1.161
PERMIT, flags={origin_is_acl,transport_parent,}
#pkts encaps: 12912, #pkts encrypt: 12912, #pkts digest 12912
#pkts decaps: 2382, #pkts decrypt: 2382, #pkts verify 2382
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts compr. failed: 0, #pkts decompress failed: 0
#send errors 0, #recv errors 0
local crypto endpt.: 10.32.1.162, remote crypto endpt.: 10.32.1.161
path mtu 1500, media mtu 1500
current outbound spi: 101
inbound esp sas:
spi: 0x4624F3AD(1176826797)
transform: esp-des esp-sha-hmac ,
in use settings ={Transport, }
slot: 0, conn id: 2098, flow_id: 69, crypto map: temp
sa timing: remaining key lifetime (k/sec): (1048130/3179)
IV size: 8 bytes
replay detection support: Y
inbound ah sas:
inbound pcp sas:
outbound esp sas:
spi: 0x101(257)
transform: esp-des esp-sha-hmac ,
in use settings ={Transport, }
slot: 0, conn id: 2099, flow_id: 70, crypto map: temp
sa timing: remaining key lifetime (k/sec): (1046566/3179)
IV size: 8 bytes
replay detection support: Y
outbound ah sas:
outbound pcp sas:
interface: Tunnel0
Crypto map tag: temp, local addr. 10.32.1.162
local ident (addr/mask/prot/port): (10.32.1.162/255.255.255.255/0/0)
remote ident (addr/mask/prot/port): (10.32.1.161/255.255.255.255/0/0)
current_peer: 10.32.1.161
PERMIT, flags={transport_parent,}
#pkts encaps: 0, #pkts encrypt: 0, #pkts digest 0
#pkts decaps: 0, #pkts decrypt: 0, #pkts verify 0
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts compr. failed: 0, #pkts decompress failed: 0
#send errors 0, #recv errors 0
local crypto endpt.: 10.32.1.162, remote crypto endpt.: 10.32.1.161
path mtu 1500, media mtu 1500
current outbound spi: 0
inbound esp sas:
inbound ah sas:
inbound pcp sas:
outbound esp sas:
outbound ah sas:
outbound pcp sas:
local ident (addr/mask/prot/port): (10.32.1.162/255.255.255.255/47/0)
remote ident (addr/mask/prot/port): (10.32.1.161/255.255.255.255/47/0)
current_peer: 10.32.1.161
PERMIT, flags={origin_is_acl,transport_parent,}
#pkts encaps: 13017, #pkts encrypt: 13017, #pkts digest 13017
#pkts decaps: 2410, #pkts decrypt: 2410, #pkts verify 2410
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts compr. failed: 0, #pkts decompress failed: 0
#send errors 0, #recv errors 0
local crypto endpt.: 10.32.1.162, remote crypto endpt.: 10.32.1.161
path mtu 1500, media mtu 1500
current outbound spi: 101
inbound esp sas:
spi: 0x4624F3AD(1176826797)
transform: esp-des esp-sha-hmac ,
in use settings ={Transport, }
slot: 0, conn id: 2098, flow_id: 69, crypto map: temp
sa timing: remaining key lifetime (k/sec): (1048124/3176)
IV size: 8 bytes
replay detection support: Y
inbound ah sas:
inbound pcp sas:
outbound esp sas:
spi: 0x101(257)
transform: esp-des esp-sha-hmac ,
in use settings ={Transport, }
slot: 0, conn id: 2099, flow_id: 70, crypto map: temp
sa timing: remaining key lifetime (k/sec): (1046566/3176)
IV size: 8 bytes
replay detection support: Y
outbound ah sas:
outbound pcp sas:
Troubleshoot
En esta sección encontrará información que puede utilizar para solucionar problemas de configuración.
Comandos para resolución de problemas
La herramienta Output Interpreter (sólo para clientes registrados) permite utilizar algunos comandos “show” y ver un análisis del resultado de estos comandos.
Nota: Antes de ejecutar los comandos debug, consulte Información Importante sobre Comandos Debug.
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debug crypto isakmp (router de Cisco IOS): muestra información detallada sobre la negociación de la fase I (modo principal) del Intercambio de claves de Internet (IKE).
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debug crypto ipsec (router Cisco IOS): muestra información detallada sobre la negociación IKE fase II (modo rápido).
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debug crypto engine (Cisco IOS Router): depura el cifrado/descifrado de paquetes y el proceso Diffie-Hellman (DH).
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debug ip rip (router Cisco IOS): depura el protocolo de routing RIP.
Ejecute el comando show ip routing desde el concentrador VPN 5000.
VPN5002_8_A5E9C800: rip#show ip routing IP Routing Table for rip Directly Connected Routes: Destination Mask Ref Uses Type Interface 10.1.1.0 FFFFFF00 5 STIF VPN0:1 10.1.1.0 FFFFFFFF 0 STIF Local 10.1.1.1 @FFFFFFFF 5 LocalLocal 10.1.1.255 FFFFFFFF 0 STIF Local 20.20.20.0 FFFFFF00 1352 STIF Ether1:0.2 20.20.20.0 FFFFFFFF 0 STIF Local 20.20.20.20 @FFFFFFFF 14 LocalLocal 20.20.20.255 FFFFFFFF 1318 STIF Local 127.0.0.1 FFFFFFFF 0 STIF Local 172.18.124.0 FFFFFF00 13789 STIF Ether1:0.1 172.18.124.0 FFFFFFFF 0 STIF Local 172.18.124.219 @FFFFFFFF 6 LocalLocal 172.18.124.255 FFFFFFFF 13547 STIF Local 224.0.0.5 FFFFFFFF 0 STIF Local 224.0.0.6 FFFFFFFF 0 STIF Local 224.0.0.9 FFFFFFFF 15 STIF Local 255.255.255.255 @FFFFFFFF 221 LocalLocal Static Routes: Destination Mask Gateway Metric Ref Uses Type Interface 10.31.0.0 FFFF0000 Interface 1 0 Stat VPN0:1 10.32.1.162 @FFFFFFFF 10.32.1.161 2 0 *Stat VPN0:1 Dynamic Routes: Src/ Destination Mask Gateway Metric Ref Uses Type TTL Interface DEFAULT 10.1.1.2 1 293 RIP2 165 VPN0:1 10.0.0.0 FFFFFF00 172.18.124.216 1 0 RIP1 160 Ether1:0.1 10.31.0.0 FFFF8000 10.1.1.2 1 0 RIP2 165 VPN0:1 10.32.0.0 FFFF8000 10.1.1.2 1 0 RIP2 165 VPN0:1 Configured IP Routes: Destination Mask Gateway Metric IFnum Flags 10.31.0.0 FFFF0000 Interface 1 VPN 0:1 Redist = none Total Routes in use: 23 Mask -> @Host route Type -> Redist *rip #ospf
VPN5002_8_A5E9C800: rip#show vpn stat ver Current In High Running Script Script Script Active Negot Water Total Starts OK Error -------------------------------------------------------------- Users 0 0 0 0 0 0 0 Partners 1 0 1 1 1 0 0 Total 1 0 1 1 1 0 0 Stats VPN0:1 Wrapped 2697 Unwrapped 14439 BadEncap 0 BadAuth 0 BadEncrypt 0 rx IP 14439 rx IPX 0 rx Other 0 tx IP 2697 tx IPX 0 tx Other 0 IKE rekey 0 Input VPN pkts dropped due to no SA: 1 Input VPN pkts dropped due to no free queue entries: 0 IOP slot 1: Current In High Running Script Script Script Active Negot Water Total Starts OK Error -------------------------------------------------------------- Users 0 0 0 0 0 0 0 Partners 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Stats Wrapped Unwrapped BadEncap BadAuth BadEncrypt rx IP rx IPX rx Other tx IP tx IPX tx Other IKE rekey Input VPN pkts dropped due to no SA: 0 Input VPN pkts dropped due to no free queue entries: 0 IOP slot 2: Current In High Running Script Script Script Active Negot Water Total Starts OK Error -------------------------------------------------------------- Users 0 0 0 0 0 0 0 Partners 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Stats Wrapped Unwrapped BadEncap BadAuth BadEncrypt rx IP rx IPX rx Other tx IP tx IPX tx Other IKE rekey Input VPN pkts dropped due to no SA: 0 Input VPN pkts dropped due to no free queue entries: 0 IOP slot 3: Current In High Running Script Script Script Active Negot Water Total Starts OK Error -------------------------------------------------------------- Users 0 0 0 0 0 0 0 Partners 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Stats Wrapped Unwrapped BadEncap BadAuth BadEncrypt rx IP rx IPX rx Other tx IP tx IPX tx Other IKE rekey Input VPN pkts dropped due to no SA: 0 Input VPN pkts dropped due to no free queue entries: 0
Información Relacionada
Historial de revisiones
| Revisión | Fecha de publicación | Comentarios |
|---|---|---|
1.0 |
09-Nov-2001 |
Versión inicial |
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