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26.06.2015, admin  
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TweetSite-to-Site IPSec VPN Tunnels are used to allow the secure transmission of data, voice and video between two sites (e.g offices or branches). This article will show how to setup and configure two Cisco routers to create a permanent secure site-to-site VPN tunnel over the Internet, using the IP Security (IPSec) protocol. IPSec VPN tunnels can also be configured using GRE (Generic Routing Encapsulation) Tunnels with IPsec. ISAKMP (Internet Security Association and Key Management Protocol) and IPSec are essential to building and encrypting the VPN tunnel. To help make this an easy-to-follow exercise, we have split it into two steps that are required to get the Site-to-Site IPSec VPN Tunnel to work. Next step is to create an access-list and define the traffic we would like the router to pass through the VPN tunnel.


Network Address Translation (NAT) is most likely to be configured to provide Internet access to internal hosts. Rahul Singh is a Cisco CCIE Security certified Engineer (#29110) and an active member of the Firewall.cx commuity. The VPN tunnel is created over the Internet public network and encrypted using a number of advanced encryption algorithms to provide confidentiality of the data transmitted between the two sites.
GRE tunnels greatly simply the configuration and administration of VPN tunnels and are covered in our Configuring Point-to-Point GRE VPN Tunnels article. ISAKMP, also called IKE (Internet Key Exchange), is the negotiation protocol that allows two hosts to agree on how to build an IPsec security association. The goal is to securely connect both LAN networks and allow full communication between them, without any restrictions.


This means that if we have five different remote sites and configured five different ISAKMP Phase 1 policies (one for each remote router), when our router tries to negotiate a VPN tunnel with each site it will send all five policies and use the first match that is accepted by both ends. When configuring a Site-to-Site VPN tunnel, it is imperative to instruct the router not to perform NAT (deny NAT) on packets destined to the remote VPN network(s). The time required to bring up the VPN Tunnel is sometimes slightly more than 2 seconds, causing the first ping to timeout.



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