Configuration d'IPSec de routeur à routeur, avec clés partagées et surcharge NAT, entre des réseaux privés

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Mis à jour:14 janvier 2008

ID du document:7276

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Contenu

Introduction

Conditions préalables

Conditions requises

Components Used

Conventions

Configuration

Diagramme du réseau

Configurations

Vérification

Dépannage

Dépannage des commandes

Informations connexes

Introduction

Cet exemple de configuration montre comment chiffrer le trafic entre deux réseaux privés (10.50.50.x et 10.103.1.x) à l'aide d'IPSec. Les réseaux se reconnaissent à l'aide de leurs adresses privées.

Conditions préalables

Conditions requises

Aucune spécification déterminée n'est requise pour ce document.

Components Used

Les informations contenues dans ce document sont basées sur les versions de matériel et de logiciel suivantes :

Logiciel Cisco IOS® Version 12.3.1a
Routeurs Cisco 2691

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.

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 - Affiche les négociations IPSec de la phase 2.
debug crypto isakmp sa - Affiche les négociations ISAKMP (Internet Security Association and Key Management Protocol) de la phase 1.
debug crypto engine : affiche les sessions chiffrées.