Cisco CISCO851-K9 - 851 Integrated Services Router - Page 88

7-10
Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
OL-5332-01
Chapter 7 Configuring VPNs Using an IPSec Tunnel and Generic Routing Encapsulation
Configuration Example
tunnel source fastethernet 0
tunnel destination interface 192.168.101.1
ip route 20.20.20.0 255.255.255.0 tunnel 1
crypto isakmp policy 1
encryption 3des
authentication pre-share
group 2
!
crypto isakmp client configuration group rtr-remote
key secret-password
dns 10.50.10.1 10.60.10.1
domain company.com
pool dynpool
!
crypto ipsec transform-set vpn1 esp-3des esp-sha-hmac
!
crypto ipsec security-association lifetime seconds 86400
!
crypto dynamic-map dynmap 1
set transform-set vpn1
reverse-route
!
crypto map static-map 1 ipsec-isakmp dynamic dynmap
crypto map dynmap isakmp authorization list rtr-remote
crypto map dynmap client configuration address respond
!
! Defines the key association and authentication for IPSec tunnel.
crypto isakmp policy 1
hash md5
authentication pre-share
crypto isakmp key cisco123 address 200.1.1.1
!
!
! Defines encryption and transform set for the IPSec tunnel.
crypto ipsec transform-set set1 esp-3des esp-md5-hmac
!
! Associates all crypto values and peering address for the IPSec tunnel.
crypto map to_corporate 1 ipsec-isakmp
set peer 200.1.1.1
set transform-set set1
match address 105
!
!
! VLAN 1 is the internal interface
interface vlan 1
ip address 10.1.1.1 255.255.255.0
ip nat inside
ip inspect firewall in ! Inspection examines outbound traffic.
crypto map static-map
no cdp enable
!
! FE4 is the outside or Internet-exposed interface
interface fastethernet 4
ip address 210.110.101.21 255.255.255.0
! acl 103 permits IPSec traffic from the corp. router as well as
! denies Internet-initiated traffic inbound.
ip access-group 103 in
ip nat outside
no cdp enable
crypto map to_corporate ! Applies the IPSec tunnel to the outside interface.