Programming

HSRP is one of the most know FHRP (Fisrt Hop Routing) protocols proposed by Cisco to help secure (in terms of redundancy) the gateway (for hosts or servers) in a LAN. The objective is simple: configure one gateway address and provision as many real routers (gateways) to serve it. To understand how it works let’s

In this post let’s talk about cabling, especially ethernet cabling to meet speeds of 1 gig. 4 elements are discussed : operation as described in the standard, awg metric, pinout and twist. Alternatives to this copper cabling are: wireless, fibre, etc. to achieve the same speed and transmit capacity. ethernet cabling 1 gig per second

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