Network technologies and trends

Dec 27 2015   5:26PM GMT

How to configure Site-to-Site IPSec VPN on Cisco Routers? – Series 1

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

Cisco Routers

IPSec is the protocol one can use to establish a Site-to-Site VPN , as it is widely used because its an open standard protocol which offers secure and encrypted communication over the public internet domain. IPSec works at Network later and only pass unicast traffic. I will brief you all about how IPSec works

IPSEC works on 5 parameters

  1. Interesting Traffic
    1. ACL
  2. Phase 1 (ISAKMP/ IKEv1)
    1. IPSec device negotiate an IKE Security Policy & establish a secure channel for communication
  3. Phase 2 (IPSEC)
    1. IPSec devices negotiate an IPSec security policy to protect data
  4. Data Transfer
    1. Data is transferred based
      1. IPSec  parameters
      2. Keys negotiated
  5. IPSec Tunnel Terminated
    1. IPSec SAs terminate when timing out or a certain data volume is reached

Site to Site IPSEC VPN

We will be using the following topology to configure site-to-site IPSec VPN between two Cisco Routers. In the upcoming post lets see how to configure the Site-to-Site IPSec VPN using Cisco Routers


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