Typical Cisco router VPN configuration (1)

This article uses VPN technology to achieve interconnection between two parts of the network, simulate ISP, close to practicality, the article mainly shows us the specific operation steps, mainly the input of basic commands.

In this experiment, we use the Cisco 2600 router and VPN technology to achieve the network interconnection between one branch and two parts. To stay close to practicality, we still use Cisco 3640 to simulate ISP.

Through the introduction of the basic part of the network, you should have a certain understanding of the VPN technology, there are two main aspects in the implementation of VPN: the establishment of VPN Tunnel and IPSec Encryption

Cisco 2600 with GRE Tunnel
Current configuration
!
Version 12.0:
Sevice timestamps debug uptime
Sevice timestamps log uptime
Sevice password-encryption
!
Hostname bluestudy1
!
Enable passsword cisco
!
Memory-size iomem 25
Ip subnet-zero
No ip domain-lookup
!
Interface Tunnel0
Ip address 172.16.101.1 255.255.255.0
No ip directed-broadcast
Ip mtu 1467
Tunnel sourece 199.1.1.2
Tunnel destination 199.1.2.2
!
Interface serial0/0
No ip address
No ip directed-broadcast
Encapsulation frame-relay
No ip mroute-cache
Frame-relay lm-type ansi
!
Interface serial0/0.1 point-to-point
Description connected to internet
Ip address 199.1.1.2 255.255.255.255.248
No ip directed-broadcast
Ip nat outside
No arp frame-relay
Frame-relay interface-dlci 111
!
!
Interface ethernet0/0
Ip address 172.16.1.1 255.255.255.0
No ip directed-broadcast
Ip nat inside
!
Router VPN 100
Network 172.16.0.0
!
Router rip
Version 2
Network 172.16.0.0
No auto-summary
!
Ip nat pool bluestudy 199.1.1.3 199.1.1.10 netmask 255.255.255.248
Ip nat inside sourece list 2 pool bluestudy overload
Ip nat inside sourece static 172.16.1.3 199.1.1.5
Ip classless
Ip route 0.0.0.0 0.0.0.0 srial0/0.1
Ip http server
!
Access-list 2 permit 172.16.1.0 0.0.255
Snmp-server community public RO
!
Line con 0
Exec-timeout 0 0
Password cisco
Login
Transport input none
Line aux 0
Line vty 0 4
Password cisco
Login
!
End