Troubleshooting NTP

Those who have read my article on Non Technical tips on CCIE Troubleshooting and who are following my Technical tips on CCIE Troubleshooting would be wondering why I have chosen to write an article on NTP after writing a post on Troubleshooting MPLS VPN. NTP is trivial as compared to MPLS VPN, so why not the new post on BGP or OSPF? The message I want to send home is that no topic is simple in CCIE. I thought NTP is easy and did not practice it and during Lab, this simple topic caused me to go blank because without practice, there is no strategy and without strategy you don’t know what to do. In this article we will see few scenarios with regards to troubleshooting NTP in a Cisco network. Continue reading

Build your own Cisco Terminal Server with Raspberry Pi

I have been working in Computer networking for more than 8 years now and the biggest fear I still harbor is losing access to a router by misconfiguration. During my first stint with Service Provider networks, losing access to a router or switch would mean running to the Data Centre and taking console to a router and revert the changes¬†and this because we didn’t have console servers in our Data Centre.¬†Our Data centre was just across the NOC so it would take less than a minute to reach the equipments. During my second stint, the Data centre was the largest in India and going to the Data Centre would take minimum of 15 minutes from the NOC. Although we had a management network connecting all networked equipments, this did not help when a router or switch was malfunctioning and the only option left was taking console. My third stint with Service Provider network had no option of running to the router as many of the PoPs were international. Few of the larger PoPs had Terminal Servers but not all had this. A question would run through anyones mind as to why someone would not provision a console server on a remote site? The primary reason is the cost. The second reason is that it does not make business sense to have a console server for a couple of routers. Continue reading

Linux Server for Students and Freshers

Every professional must have faced a dilemma at least once in their life where they are not recruited because they don’t have work experience. How can they get Work experience until they are recruited once? Thanks to simulations, folks who are in IT can at least work on a simulation of what they expect at work place. For those who intend to get into networking, there are simulations available which can simulate networks with real operating systems. For those who intend to get into Linux server administrations, Simulations are not exactly required as almost anyone can install Linux on a system or dual boot your laptop or desktop. There are still cases where you don’t want to install Linux on your working system or there is no system to install Linux on. Thank God for Raspberry Pi, a computer is in everyones reach now.Image

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Hotmail IMAP on Mac Mail

It has been more than 10 years I have been using Hotmail and the one feature I have been yearning for was IMAP on Hotmail (now outlook.com). Every other web based email provider has it, Yahoo has it, Google has it but my primary mail has always been hotmail. I have lost more than 5 years of mails just because while configuring email with POP Protocol, the mail client was set to download messages from the server. There was no way of putting the mail back to the server once downloaded and there was no economically feasible way to take a backup of the mails back then. Also, there is the other problem of deleting and moving mails on your Laptop as well as doing the same on the Web Mail. With a recent announcement from Microsoft, Outlook.com has begun supporting IMAP protocol. With this, we can configure the Mac mail with IMAP and enjoy the beauty of IMAP with Hotmail. Continue reading