Convert Multicast IP To Mac Address Online

For multicast forwarding, the mac addresses in the range 01-00-5E-00-00-00 to 01-00-5E-7F-FF-FF have been reserved. The most significant 25 bits of the above 48-bit mac address are fixed while the lower 23 bits are variable. These lower 23 bits are derived from the lower 23 bits of the multicast IP address. The IP multicast range spans from 224.0.0.0 to 239.255.255.255. The most significant 4 bits of this address range is fixed ( 1110 ). Hence when an IP multicast address maps to a mac address, out of the total of..... Read More

Crafting VxLAN packets using Ostinato

The buzzwords these days are "virtualization" and "cloud". At the recently concluded VMworld 2011, VMware and Cisco announced the VxLAN technology which was developed to address scalability problems in today's data centers. Virtualized data centers today using traditional VLANs have scaling problems due to the 12-bit VLAN space which translates to a maximum of 4094 usable VLANs. Another requirement for multi-tenant networks is to isolate tenant traffic from one another. A VLAN could be used to provide this isolation on a L2 network but is again limited by the the..... Read More

How To Customize Genesis WordPress Theme – Part I

This is the first post in a series on how to customize the Genesis premium theme. I recently installed the Genesis premium theme from Studiopress and have been experimenting with customizing it. I would be sharing on what all was tried and what results did it yield. One basic tip to remember is to always use the Genesis Child theme instead of making changes directly in the Genesis framework Customizing the Sidebar The default sidebar that comes with Genesis is empty. You just have a primary widget space and it..... Read More

C Program For Generating Incremental MAC And IP Addresses

The other day I had this requirement to generate 4K incremental MAC and IP addresses and use them for some configuration. Typing 4k addresses by hand was never an option. So I spent some time to write a small C program that did the job for me for generating 4K mac and ip addresses starting from a given initial value. The idea was pretty simple The program should be able to print out the addresses which I can copy paste to create eg a command file. The program should take..... Read More

Rental Apartment Inspection Checklist

If you are looking to take a house on rent in the near future, read on. Renting a house is not an easy job. It requires you to visit multiple houses in different apartment complexes. For every house you need to evaluate whether it is fitting your requirements and whether it has all the bare minimum bells and whistles that you desire. photo credit: Sarah_Ackerman If you are lucky, you can find one pretty quickly. On the other hand, you might just have to wait for a good house for..... Read More