In this post, let’s recall what is subnetting (for routing and switching purposes) and how it is done. introduction and motivation Network subnetting is very important subject that maybe referred to as VLSM for variable length subnetting. The basic idea is about managing a space of IP addresses (IPv4). Historically, a network length or space

In this blog let’s try to connect to a home network from outside (internet) in a secure manner using SSL. NAT and PAT NAT and PAT is what allowed local IP addresses translation or mapping to some routable public IP address (over the internet). This mapping can be one to one (NAT) or many to

In this serie of posts we’ll explore routing operation. Let’s start from the general idea of how could we manage trafic, a move from one location to another… In the example of the figure presented next, the person in A wants to join its colleagues in location B through the network topology described in the

In this blog we explore how a gateway (a router) present in a LAN handles routing to the outside of this network and use redirection to enhance this operation. lab setup Our lab setup is 3 routers: R1, R2 and R3, in addition to 2 PC: PC1 and PC2. In this lab, PC1 tries to

in this post let’s detail the operation of PIM (Protocol Independent Multicast) in sparse mode. Previous posts tackled the operation of PIM dense mode. Let’s recall that PIM is the multicast routing protocol that allows PIM routers exchange information needed distribute multicast traffic to receivers. lab setup In our setup, Client1 is configured to join