Tag: VPN

Intro

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

This story will be a turning point for my blog future starting with a change in writing methods and changing those methods to a more causal fashion.

INTRO

For now all my text here where somehow depersonalized and tech oriented in a way that it was all written like in some book. User manual to me concise. Maybe this is the main reason that now when I got back to revise some parts of the texts there was an impression that those text are very boring. There is something missing inside them, maybe me?
Of course, I didn’t start to write this blog two years ago because there was a huge need for someone new to write about old networking stories about protocols and networking standards. I did start to write because I was young enthusiastic freshy networker who was in his all day job searching, part-time Cisco teaching and CCNP studying period.
That was actually not job free time for me, but it was intense and fulfilling time. Having some experience with web before and now spending whole days with my head inside Cisco Press books it was somehow natural to start a blog. Yes I know, everybody wants to write something on the web, but that is the main reason for this post, I you wondered what is this all about. I can now finally say that if I did not give up writing this blog until now then it’s the real proof that there is actually somebody reading it and that I can finally consider myself a networking blogger but more that all an networking geek. Jup, that’s right, there are people who are not ashamed of being geeky technicians.

A VPN (virtual private network) offers network connection possibility over an extensive physical distance (remoteness). But you need to know that it can work over both on private networks and public networks (Internet).

VPN in simple words make possible for clients or whole LAN-s on other side of the internet to connect into main LAN pesmises and have the “technical impression” that they are localy connected to this site. This includes gaining the local IP address from local DHCP pool, possibility to use all the LAN resources that are defined by the administrator etc.