A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or individual users with secure access to their organization’s network.  The following tutorial will show you how to connect two locations together with an IPSec VPN using pre-shared authentication.



Broadband prices get lower and lower while speeds keep getting faster and faster. Although VPNs have mostly been used for non-critical, low traffic connections, many companies are looking to the internet for primary connectivity.

There are 5 basic steps to configure a vpn using cisco routers.

1) Configure the ISAKMP policy
2) Configure the ISAKMP pre-shared key
3) Configure the IPSec transform-set
4) Configure an access-list to identify traffic to be encrypted
5) Configure a crypto map to tie steps 2 – 4 together.
6) Apply the crypto map to the external interface.



ipsec1.jpg


Configure router R1
Configure router R2




Download the ipsec.net config file and ISP router configuration here.


If this is not what you are looking for, here are a few other VPN tutorials I have:
How to configure remote access vpn on a router

How to configure a GRE/IPSec VPN – Part 1

How to configure a GRE/IPSec VPN – Part 2

How to configure NAT for an IPSec VPN

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