Tag: IPSec

What is the difference between tunnel | transport mode in IPsec


IPsec makes VPN connection possible. I enables to simulate a leased line across public Internet and thus enable us to get secure connection across unsecured environment. It enables encryption, authentication and protection of our data when sent across insecurity of the world’s biggest internetwork – Internet.

It’s the cheap way to simulate a leased line, the way to send private data across the public network without compromising privacy. The goal of IPsec is to secure services and lower the cost of data transfer. Try to compare it to pricing of data transfers across dark cables / leased lines.

There are two parts of IPsec security suite
– ESP – Encapsulating Security Payload
– AH – Authentication Header

Based on our situation we can configure two different modes of operation and here we are to make the things clear about the differences and the technology behind those modes.

IPSec Transport Mode and Tunnel Mode

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IPSec is basically a way to secure the data transfer between computers. IPSec is making data traffic between two nodes secure by making these things:

  • Data Authentication
    • Authentication – The packets can be spoofed and not sent from the place they seem they are sent. Data origin authentication can be provided with configuration of IPSec. IPSec will enable us to ensure that received packet from a trusted party is really originating from that party.
    • Data integrity – IPSec can be configured to secure that the data packet are not changed when they are crossing the network.
    • Anti-replay protection – IPSec is able to check that the packets received are not duplicates of previous data packets.
  • Encryption
    • IPSec is a technology that enables you to encrypt network data so that it cannot be captured and used by unauthorized persons.

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