Create an IPsec VPN tunnel using Packet Tracer - CCNA Security

http://danscourses.com - Learn how to create an IPsec VPN tunnel on Cisco routers using the Cisco IOS CLI. CCNA security topic.

1. Starting configurations for R1, ISP, and R3. Paste to global config mode :
hostname R1
interface g0/1
ip address 192.168.1.1 255.255.255.0
no shut
interface g0/0
ip address 209.165.100.1 255.255.255.0
no shut
exit
ip route 0.0.0.0 0.0.0.0 209.165.100.2

hostname ISP
interface g0/1
ip address 209.165.200.2 255.255.255.0
no shut
interface g0/0
ip address 209.165.100.2 255.255.255.0
no shut
exit

hostname R3
interface g0/1
ip address 192.168.3.1 255.255.255.0
no shut
interface g0/0
ip address 209.165.200.1 255.255.255.0
no shut
exit
ip route 0.0.0.0 0.0.0.0 209.165.200.2

2. Make sure routers have the security license enabled:
license boot module c1900 technology-package securityk9

3. Configure IPsec on the routers at each end of the tunnel (R1 and R3)
!R1
crypto isakmp policy 10
encryption aes 256
authentication pre-share
group 5
!
crypto isakmp key secretkey address 209.165.200.1
!
crypto ipsec transform-set R1-R3 esp-aes 256 esp-sha-hmac
!
crypto map IPSEC-MAP 10 ipsec-isakmp
set peer 209.165.200.1
set pfs group5
set security-association lifetime seconds 86400
set transform-set R1-R3
match address 100
!
interface GigabitEthernet0/0
crypto map IPSEC-MAP
!
access-list 100 permit ip 192.168.1.0 0.0.0.255 192.168.3.0 0.0.0.255

!R3
crypto isakmp policy 10
encryption aes 256
authentication pre-share
group 5
!
crypto isakmp key secretkey address 209.165.100.1
!
crypto ipsec transform-set R3-R1 esp-aes 256 esp-sha-hmac
!
crypto map IPSEC-MAP 10 ipsec-isakmp
set peer 209.165.100.1
set pfs group5
set security-association lifetime seconds 86400
set transform-set R3-R1
match address 100
!
interface GigabitEthernet0/0
crypto map IPSEC-MAP
!
access-list 100 permit ip 192.168.3.0 0.0.0.255 192.168.1.0 0.0.0.255

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