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Tekcert's 2nd Birthday!

Birthday Cake 2 is now 2 years old! Can you believe how fast the past year has gone? It was definitely a busy and productive year and hopefully 2012 will top it. I wanted to write this blog post mainly to celebrate's birthday, but I also want to take a minute to say thanks.

First, I'd like to thank all of the readers. Without you, wouldn't be what it is today. With all of your help this has become a great place to share information, not only from us to you, but with the forums and comments many of you have shared with the community. Thank you for being active participants.

Best of Show at CES 2012

So, CES 2012 came and went this week. For the most part, nothing extraordinary announced at the show, no game changers. In the words of one blogger, this year was "more evolutionary than revolutionary." There were however a few cool gadgets worth mentioning. Read on for videos and write-ups on the three gadgets that stood out most.

ioSafe Rugged Portable Hard Drives

Ok, this is just too awesome not to post about. ioSafe is a company that manufactures and sells rugged computer peripherals that can withstand considerable abuse. To demonstrate their new Thunderbolt portable SSD/RAID disk, they pump a million volts of electricity into one using a Tesla coil. I will never think of Electrostatic Discharge in the same way...

Video below:

CES 2012 is in full swing

The 2012 Consumer Electronic Show officially kicks off today in Las Vegas,
Nevada. Media reporters and bloggers of the world have been busy the last few days with exclusive previews of new products.

The buzz this year seems to be focused on Ultrabooks, or basically ultra-thin laptops that hope to be as thin and cool as the MacBook Air.

This is Microsoft's final year at CES, as heard during their Monday night keynote.

Tablets aren't as big of a buzz as last year since the battle for first place has clearly been secured by Apple's iPad; but keep an eye out for improvements in the competition to battle Amazon for second place.

How to configure DHCP Snooping on a Cisco Catalyst switch

Command Line

A question was asked in the Tekcert forums regarding DHCP snooping configuration. After thinking about writing an in depth response, I decided to just write a full blown blog post.

Everything in this post has been tested in a lab environment with a Cisco 3550, Infoblox DHCP servers, a Netgear router as a "rogue" dhcp server, and a MacBook Pro as a client. The 3550 is configured with ip routing and a layer 3 interface on the subnet where the DHCP servers are located ( VLAN 20 has been created on the 3550 with an interface ip address of All the DHCP server configuration and helper addresses were tested and working prior to implementing DHCP snooping to eliminate any doubt as to whether the DHCP snooping configuration is working or not. So, let's get started.

The Kindle

I've been thinking about picking up a Kindle lately. Everyone I've talked to that has one says they're awesome for reading.

The plane old Kindle seems to be the way to go since all I really want it for is reading, but the gadget geek in me wants to try out the Kindle Fire to play with the extra features. Anyone have one of these that can share there experience in the comments? I'd appreciate it a lot and I'm sure others would too.

GNS3: A Test for Employers

Someone forwarded this post to me...It's a 30 minute test in GNS3 that employers can use to test a potential CCNP-level employee to make sure they know what their doing. What great idea!

Clock rate versus bandwidth

Command Line

If you have ever setup a lab of Cisco routers, you likely have configured a clock rate on one or more serial interfaces. You might have also configured the bandwidth setting on an interface as well. Is one required and not the other? Do they both need to be configured? That's what many people have wondered, including myself when I first started configuring Cisco routers over a decade ago. So I figured I'd create a quick explanation to help people better understand the bandwidth and clock rate commands.


The bandwidth command administratively sets the bandwidth of an interface. When a router boots up, it sets a default bandwidth on an interface which can be seen with the show interface command.

Synology DS411j Network Attached Storage Review

A little over a year ago I was in search of a storage solution for my home network. Several readers provided some great suggestions in the comments area of that first post which helped nudge me toward ultimately purchasing the Synology DS411j DiskStation.

So, here it is nearly a year after picking it up and I must say - this thing rocks! I wish I would have bought one of these sooner. This post provides an overview for some of the best this box has to offer.

Cisco QOS Exam

If you are currently working toward the CCVP, which was renamed to the CCNP Voice last year, one of the exams on the check list is the 642-642 QOS Exam, but only for a couple more months. If you take the QOS exam after February 28th 2012, it will no longer count toward the CCNP Voice. The new exam list is available on Cisco's page for the CCNP Voice, but here's a quick reference:


Last night I flashed my WD TV Live Plus HD Media Player with an aftermarket version of code called WDLXTV. Some notable differences are in the background image and the placement of the Internet media apps. For example, Youtube and Netflix are now in the Video menu, similarly Live365 and Pandora are in the Music menu.

It's not perfect, but at least my media player finds network shares and plays files again. That's more than I can say about the official firmware.

The Background Story

I purchased the WD TV Live Plus HD Media Player earlier this year because I wanted to start to digitize my dvd library. The idea of simply clicking a button on a remote control and selecting the movie I wanted to watch seemed awesome. Obviously any amount of time spent setting up that type of system would be justified in the many seconds a year I would save by not having to get up off the couch to manually insert a dvd into the player. As a man, I claim the right to justify anything I do with my infallible man-logic.

How to use the changeip command to modify the FQDN of a Mac OS X Server

I was recently faced with having to change the domain name on a Mac OS X Server. If I had to do this on a Windows machine, it would be a relatively simple process using a GUI interface. However, on a Mac server, there isn't (as of version 10.6.8) a way to change the fully qualified domain name (FQDN) via a GUI. Thankfully, there is a way to change the domain settings using the CLI and it's a piece of cake.

The changeip command was created to allow administrators to change the ip address and FQDN in static config files on a Mac OS X Server. For example, if you setup the DNS and iCal services, instead of manually updating the config files associated with these services, simply running the changeip command updates the files for you. 

The syntax for the command is as follows:

IPv6 Action Plan Video

If you have just been given the task of implementing IPv6 in your company or if you are in the middle of a deployment, you may be asking yourself "How?!" How exactly should you roll out an IPv6 network? Do you configure /64 subnets on point to point links or do you use /127's? How do you secure your network against the initial IPv6 attacks that are available?

These questions and more are covered in this hour long TechWise TV  episode, The IPv6 Action Plan. Some very good points and useful information here, have a look...

Netgear N750 Wireless Dual Band Gigabit Router (WNDR4000)

Five months ago my old wireless AP was on its last legs and needed to be replaced. Nearly every day, wireless access in my house simply wouldn't work and after unplugging the power and plugging it back in, wireless would work for a few short hours. That got tiresome, so I started searching for a new wireless solution.

I knew I wanted something that supported 802.11N, had Gigabit Ethernet ports, and could either be used as just a wireless AP or a router if necessary. I searched for hours, read reviews, and ultimately settled on the Netgear N750 450 Mbps Wireless Dual Band Gigabit Router

Verizon Wireless 4G LTE Mobile Hotspot MiFi 4510L

I recently had the opportunity to test a Verizon Wireless MiFi Hotspot. The model number is Novatel Wireless MiFi4510L and is branded with the Verizon Wireless logo.

Once configured, it shows up like a normal wireless SSID and supports security settings including WPA2 Personal/PSK (AES). Out of the box, the setup takes all of about 5 minutes to customize the SSID, configure an admin password, and setup a few other options.

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by Dr. Radut