Configurar al router a router del IPSec, Pre-shared, sobrecarga NAT entre las redes privadas

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Actualizado:14 de enero de 2008

ID del documento:7276

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Contenido

Introducción

prerrequisitos

Requisitos

Componentes Utilizados

Convenciones

Configurar

Diagrama de la red

Configuraciones

Verificación

Troubleshooting

Comandos para resolución de problemas

Información Relacionada

Introducción

Este ejemplo de configuración muestra cómo cifrar el tráfico entre dos redes privadas (10.50.50.x y 10.103.1.x) usando IPSec. Las redes se conocen entre sí por sus direcciones privadas.

prerrequisitos

Requisitos

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.

Software Release 12.3.1a de Cisco IOS®
Cisco 2691 Router

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). Si la red está funcionando, asegúrese de haber comprendido el impacto que puede tener cualquier comando.

router A
router B

router A
Router_A#write terminal Building configuration... Current configuration : 1638 bytes ! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname Router_A ! boot system flash:c2691-ik9o3s-mz.123-1a.bin ! ip subnet-zero ! ip audit notify log ip audit po max-events 100 no ftp-server write-enable ! crypto isakmp policy 1 hash md5 authentication pre-share crypto isakmp key cisco123 address 95.95.95.2 ! crypto ipsec transform-set rtpset esp-des esp-md5-hmac ! crypto map rtp 1 ipsec-isakmp set peer 95.95.95.2 set transform-set rtpset !--- Include the private network to private network traffic !--- in the encryption process. match address 115 ! no voice hpi capture buffer no voice hpi capture destination ! interface FastEthernet0/0 ip address 99.99.99.2 255.255.255.0 ip nat outside duplex auto speed auto crypto map rtp ! interface FastEthernet0/1 ip address 10.50.50.50 255.255.255.0 ip nat inside duplex auto speed auto ! !--- Except the private network traffic from the !--- Network Address Translation (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 99.99.99.1 ! !--- Except the private network traffic from the NAT process. access-list 110 deny ip 10.50.50.0 0.0.0.255 10.103.1.0 0.0.0.255 access-list 110 permit ip 10.50.50.0 0.0.0.255 any !--- Include the private network to private network traffic !--- in the encryption process. access-list 115 permit ip 10.50.50.0 0.0.0.255 10.103.1.0 0.0.0.255 ! !--- Except the private network traffic from the NAT process. route-map nonat permit 10 match ip address 110 ! dial-peer cor custom ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! end Router_A#

router A

Router_A#write terminal
Building configuration...
Current configuration : 1638 bytes 
! 
version 12.3 
service timestamps debug datetime msec 
service timestamps log datetime msec 
no service password-encryption 
! 
hostname Router_A 
! 
boot system flash:c2691-ik9o3s-mz.123-1a.bin 
! 
ip subnet-zero 
! 
ip audit notify log 
ip audit po max-events 100 
no ftp-server write-enable 
! 
crypto isakmp policy 1 
hash md5  
authentication pre-share 
crypto isakmp key cisco123 address 95.95.95.2 
! 
crypto ipsec transform-set rtpset esp-des esp-md5-hmac  
! 
crypto map rtp 1 ipsec-isakmp  
set peer 95.95.95.2 
set transform-set rtpset  

!--- Include the private network to private network traffic !--- in the encryption process. 

match address 115 
! 
no voice hpi capture buffer 
no voice hpi capture destination  
!  
interface FastEthernet0/0 
ip address 99.99.99.2 255.255.255.0 
ip nat outside 
duplex auto 
speed auto 
crypto map rtp 
! 
interface FastEthernet0/1 
ip address 10.50.50.50 255.255.255.0 
ip nat inside 
duplex auto 
speed auto 
! 

!--- Except the private network traffic from the !--- Network Address Translation (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 99.99.99.1 
! 

!--- Except the private network traffic from the NAT process.
 
access-list 110 deny ip 10.50.50.0 0.0.0.255 10.103.1.0 0.0.0.255 
access-list 110 permit ip 10.50.50.0 0.0.0.255 any 

!--- Include the private network to private network traffic !--- in the encryption process. 

access-list 115 permit ip 10.50.50.0 0.0.0.255 10.103.1.0 0.0.0.255 
! 

!--- Except the private network traffic from the NAT process. 

route-map nonat permit 10 
match ip address 110 
! 
dial-peer cor custom 
! 
line con 0 
exec-timeout 0 0 
line aux 0 
line vty 0 4 
login 
! 
end  
  
Router_A#

router B
Router_B#write terminal Building configuration... Current configuration : 1394 bytes ! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname Router_B ! boot system flash:c2691-ik9o3s-mz.123-1a.bin ! ip subnet-zero ! ip audit notify log ip audit po max-events 100 no ftp-server write-enable ! crypto isakmp policy 1 hash md5 authentication pre-share crypto isakmp key cisco123 address 99.99.99.2 ! crypto ipsec transform-set rtpset esp-des esp-md5-hmac ! crypto map rtp 1 ipsec-isakmp set peer 99.99.99.2 set transform-set rtpset !--- Include the private network to private network traffic !--- in the encryption process. match address 115 ! no voice hpi capture buffer no voice hpi capture destination ! interface FastEthernet0/0 ip address 95.95.95.2 255.255.255.0 ip nat outside duplex auto speed auto crypto map rtp ! interface FastEthernet0/1 ip address 10.103.1.75 255.255.255.0 ip nat inside duplex auto speed auto ! !--- 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 95.95.95.1 ! !--- Except the private network traffic from the NAT process. access-list 110 deny ip 10.103.1.0 0.0.0.255 10.50.50.0 0.0.0.255 access-list 110 permit ip 10.103.1.0 0.0.0.255 any !--- Include the private network to private network traffic !--- in the encryption process. access-list 115 permit ip 10.103.1.0 0.0.0.255 10.50.50.0 0.0.0.255 ! !--- Except the private network traffic from the NAT process. route-map nonat permit 10 match ip address 110 ! dial-peer cor custom ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! end Router_B#

router B

Router_B#write terminal
Building configuration...
Current configuration : 1394 bytes 
! 
version 12.3 
service timestamps debug datetime msec 
service timestamps log datetime msec 
no service password-encryption 
! 
hostname Router_B 
! 
boot system flash:c2691-ik9o3s-mz.123-1a.bin 
! 
ip subnet-zero 
! 
ip audit notify log 
ip audit po max-events 100 
no ftp-server write-enable 
! 
crypto isakmp policy 1 
hash md5  
authentication pre-share 
crypto isakmp key cisco123 address 99.99.99.2 
! 
crypto ipsec transform-set rtpset esp-des esp-md5-hmac 
! 
crypto map rtp 1 ipsec-isakmp  
set peer 99.99.99.2 
set transform-set rtpset  

!--- Include the private network to private network traffic !--- in the encryption process.
 
match address 115 
! 
no voice hpi capture buffer 
no voice hpi capture destination  
! 
interface FastEthernet0/0 
ip address 95.95.95.2 255.255.255.0 
ip nat outside 
duplex auto 
speed auto 
crypto map rtp 
! 
interface FastEthernet0/1 
ip address 10.103.1.75 255.255.255.0 
ip nat inside 
duplex auto 
speed auto 
! 

!--- 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 95.95.95.1 
! 

!--- Except the private network traffic from the NAT process. 

access-list 110 deny ip 10.103.1.0 0.0.0.255 10.50.50.0 0.0.0.255 
access-list 110 permit ip 10.103.1.0 0.0.0.255 any 

!--- Include the private network to private network traffic !--- in the encryption process. 

access-list 115 permit ip 10.103.1.0 0.0.0.255 10.50.50.0 0.0.0.255 
! 

!--- Except the private network traffic from the NAT process. 

route-map nonat permit 10 
match ip address 110 
! 
dial-peer cor custom 
! 
line con 0 
exec-timeout 0 0 
line aux 0 
line vty 0 4 
login 
! 
end 
Router_B#

debug crypto ipsec sa — Visualiza los IPSec Negotiations de la fase 2.
debug crypto isakmp sa — Visualiza las negociaciones del Internet Security Association and Key Management Protocol (ISAKMP) de la fase 1.
motor del debug crypto — Visualiza a las sesiones encriptadas.