IT Blogtorials

In this blogtorial, we will configure DMVPN Phase 1 with OSPF and walk through some gotchas and some pitfalls to be on the look out for. D...

In this blogtorial we will take a look at how to configure DMVPN, EIGRP over DMVPN and get the traffic going over the DMVPN encrypted using ...

In this blogtorial, we will briefly explore how to configure IPSEC Virtual Tunnel Interfaces. One of the main advantages of Virtual Tunnel I...

In this blogtorial, we will briefly explore how to configure GRE tunnels over IPSEC with routing (EIGRP). In addition, we will take a closer...

In this blogtorial, we will set up a simple preshared key IPSEC VPN tunnel between two routers. We will also use the same topology for my ne...

If you need a primer on 'How to configure PTP' on Arista click here . If you understand Arista's implementation of PTP then wait...

This post is dedicated to my good friend / colleague Mr. Rage :)  In this blogtorial we will explore one of the methods by which we can ad...

In this blogtorial, we will briefly explore TCP SACK (Selective Acknowledgement) option and the benefits of using TCP Selective Acknowledgem...

Usually when we configure BGP we expect the network to converge correctly after all the peerings come up, however under rare circumstances t...

In this blogtorial, we will briefly explore "BGP Best External" feature and walk through a scenario on how we can achieve sub-mill...

First time I saw on "TCP Spurious Retransmissions" on Wireshark, I had to look up the definition of Spurious on Google as I'v...

Simple .... BGP topology ... can you get eBGP up and running between R1 and R2? Objective: Establish successful and stable eBGP rel...

In this blogtorial we are going to take a look at the difference between area range vs summary-address command both of which can be used fo...

As the CCIE Lab exam requires you to the think outside the box a bit, I will do the same on this lab. Here is a simple topology and the basi...