In this blog, we discuss when a gateway decides that it’s not a good gateway any more and proposes a new gateway to the host by setting redirection. Introduction We explore how a gateway (a router) present in a LAN handles routing to the outside of this network and uses redirection to enhance this operation….
In this blog, we’ll discuss in detail the operation of HSRP one of the most known FHRP (First Hop Routing Protocols) protocols proposed by Cisco to help secure (in terms of redundancy) the gateway (for hosts or servers) within a LAN. The objective is simple: configure one gateway address and provision as many real routers…...
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In this blog, let’s build our first IPv6 packet. Introduction The idea of this lab is to craft an IPv6 packet from scratch using Python and Scapy library. The IDE I use is JetBrains PyCharm Community Edition 2018.3.1 x64 which is available for free at : https://www.jetbrains.com/pycharm/download/download-thanks.html?platform=windows&code=PCC The IDE The IDE interface looks like in…
In this post we’ll deep into the operation of BGP that is a Border Gateway protocol aimed at connecting (routing information exchange) autonomous system in contrast with IGP (Interior Gateway Protocols) that run into each autonomous system. Thus, we do not need to have detailed information about IGPs to exchange routing information… before this routing…...
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In this blog, we will discuss the I-BGP synchronization with IGP feature. A little introduction By definition, the BGP synchronization rule requires that when a BGP router receives information about a network from an I-BGP neighbor, it does not use this information until a matching route : static or dynamic : learned via an IGP…...
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In this blog, we will setup a Checkpoint lab using virtualbox and gns3 on windows. Introduction In this lab we implement a basic security architecture to demonstrate the operation of a firewall cluster to protect our network. Our “security domain” is segmented into four zones: Security topology Our security topology is compound by two security…...
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