MULTICAST Stories

Validating IP Address Entries in Excel

Published on: 2019-07-15

Problem: You are designing a spreadsheet where IP addresses are to be entered. Probably with subnet masks as well. You want to ensure that the IP addresses and subnet masks entered are valid. In this series I will explain how this is done, plus a few other IP address manipulating tricks in ...

Cisco WLC for Wired to Wireless mDNS and Bonjour

Published on: 2018-10-31

Bonjour and mDNS are discovery mechanisms that generally work effortlessly within a single VLAN. Those attempting to implement these protocols in a multi subnet environment often run into some significant challenges. The typical use of CAPWAP in an enterprise wireless network adds to the ...

Troubleshoot a DMVPN phase 3 architecture

Published on: 2018-10-09

In the last article, I explained how to configure DMVPN phase3, but what are the most useful commands to troubleshoot this type of network architecture? Five are the main group of commands used to troubleshoot a DMVPN topology: The “show dmvpn” and “show ip nhrp” commands permit to obtain the ...

DMVPN Phase 3: a complete guide

Published on: 2018-07-16

In a previous article, I explained what is and how it works DMVPN technology. In this article you see how to configure DMVPN phase3. This phase allows spokes to build a spoke-to-spoke tunnel and to overcomes the phase2 restriction using NHRP traffic indication messages from the hub to signal to ...

Three Months with Google Fiber

Published on: 2017-01-06

I'm one of the lucky few to benefit from Google Fiber's recent expansion into new regions (before they nixed the whole thing). I've had the service fire three months now and figured I should write up my experience with it thus far. Google Fiber announced that it would be expanding to the ...

Classic DC and M-LAG

Published on: 2016-08-29

In the pervious post we talked about BGP in Data Center and how it is a topic of discussion in between the DC and the SP arenas. In this post I will start explaining some classic DC design and laying its shortage which will engage the SP gurus with us, as well it will make sure that we all on ...

Configuring Macvlan and Ipvlan Linux Networking

Published on: 2016-03-28

Macvlan and Ipvlan are both Linux type networking interfaces that are both supported by the Linux kernel. They are unique for a few different reasons. One thing that makes them both very attractive is they do not use bridges in their implementation and natively namespace aware. It solves some ...

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