In this blog, we study RPF operation. Introduction This blog is a part of a serie of blogs about multicast routing: Test network In our test network RPF in action At R2 A “show ip interface brief” shows Digging into the interface tunnel0 details The tunnel was created by PIM process to join the RP…...
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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. Introduction This blog is a part of a serie of…...
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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 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 post, let’s recall what is subnetting for routing and switching purposes and how it is done. 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 was fixed…...
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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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