Our example setup is between two branches of a small company, these are Site 1 and Site 2. (2) Configure IPSec (ISAKMP Phase 2, ACLs, Crypto MAP) 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. IPSec then comes into play to encrypt the data using encryption algorithms and provides authentication, encryption and anti-replay services. Phase 2 creates the tunnel that protects data. Phase 1 creates the first tunnel, which protects later ISAKMP negotiation messages. ISAKMP negotiation consists of two phases: Phase 1 and Phase 2.
EDGEROUTER X VPN TUNNEL NOT GOING UP HOW TO
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. ISAKMP (Internet Security Association and Key Management Protocol) and IPSec are essential to building and encrypting the VPN tunnel.
Lastly, DMVPNs – a new VPN trend that provide major flexibility and almost no administration overhead can also be examined by reading our Understanding Cisco Dynamic Multipoint VPN (DMVPN), Dynamic Multipoint VPN (DMVPN) Deployment Models & Architectures and Configuring Cisco Dynamic Multipoint VPN (DMVPN) - Hub, Spokes, mGRE Protection and Routing - DMVPN Configuration articles. GRE tunnels greatly simply the configuration and administration of VPN tunnels and are covered in our Configuring Point-to-Point GRE VPN Tunnels article. IPSec VPN tunnels can also be configured using GRE (Generic Routing Encapsulation) Tunnels with IPsec. Readers interested in configuring support for dynamic public IP address endpoint routers can refer to our Configuring Site to Site IPSec VPN with Dynamic IP Endpoint Cisco Routers article. In this article we assume both Cisco routers have a static public IP address. 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. 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. Site-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).
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