Geek Tools – SSH and Telnet on OS X

Since I made the switch to a Mac in my day job, I’ve had two major frustrations. The first is the lack of Visio for OS X. The second one, was a little more major. I needed a replacement for MRemoteNG. I’ve searched for options and grown weary of reading the general post of “why would you need a specialized SSH tool, when it is built into the terminal of OS X?”

That statement is usually offered by a web developer who might have SSH connections to 3-5 servers on a daily basis. They live in a very specific world, and have a hard time understanding anything outside of that world. Feel bad for them; don’t hate them.

In the world of network engineers however, we may connect to 50 or more devices in a day, and may have logins to thousands of devices over an enterprise network. In that environment, there is a real need for the ability to bookmark devices.

After searching for options, I found one option that worked to some extent. This SSH workflow for Alfred is excellent. However, since I use a hosts file from to block a lot of advertisers and trackers, the index was never very useful.

After considering this problem from all angles, I finally had an “AH HA!” moment, and the simplicity of the solution made me equal parts giddy and disappointed that it took me so long to resolve. I created a file with a similar layout to a hosts file, in-fact I even named it hosts.txt. Each row of the file list a hostname, and an IP address. Since this file is purely text, you could add anything to each line that you wanted. 

device1 description
device2 unique protocol info
device3 more information

But how does this help us manage thousands of devices you ask? It doesn’t, but grep does. If we pass a search string to grep along with the file name, all matching hosts show up. Yes it is simple, but it is useful because of that!

In my file, I created a site heading by starting the line with an octothorpe. I use this so that I can search for sites. This looks like:

grep ^# hosts.txt

I can also search for all devices at a location using a statement like:

grep ^#site2 -A6 hosts.txt

In this case, I am telling it to start at “#site2″ and show the next 6 lines. Since the 6th line is the next site, I know that I am seeing all of the devices from site 2.

Finally, if I know part of the hostname, I can simply search on it, and it will display.

Hopefully this gives you a better way of managing huge networks from terminal.

Cisco Live Guest Keynote Speaker Announced – KHAN!!!

Salman Khan was just announced as the Guest Speaker for the Closing Keynote at Cisco Live US. If the name seems familiar, you have probably heard of the Khan Academy.

Picture of Salman Khan of the Khan Academy

Salman Khan of the Khan Academy

The Khan Academy uses technology to create online training which can be used anywhere in the world that has internet available. They have an incredible vision, and the backing to make it happen. I am really excited about hearing Salman speak. In my mind, the Khan Academy is the power of the internet put into practice, I might even call it a redeeming quality. Every time I see a tweet of Justine Bieber’s blowing the internet up, I simply have to remind myself that people like Salman Khan are countering the idiocracy with knowledge.

If you haven’t registered for Cisco Live US yet, now is the time to do so.

Cisco Live US 2014 – Engage Now!

Last year, I attended Cisco Live for the first time in my career. I went expecting to learn a lot, and I was not disappointed. You can read about my experiences here and here. If you haven’t read them, you should read them now. No, really, go read them. 

Now that you have read them, you know that you need to begin planning your social experience now. The scheduler will soon be available, and while you are considering the need of various classes, be certain that you create time slots to meet people. There is an incredible braintrust available in the social media hub. If you take the time to mingle and discuss you will be surprised at what you will learn.

I have long been a proponent of Twitter for IT professionals. If you and I have met over the last few years, and I haven’t asked about your social media interaction, I would question whether you actually met me and not a doppelgänger. If you have actually met me, I hope that my influence, no matter how small, pushed you to engage.

If you are new to social media and planning on hanging out in the Social Media Hub, let me offer a few suggestions.

  • Engage now. Don’t expect to show up to the social media hub without ever talking to any other engineer on twitter and expect to enjoy your experience. We like our jokes, our running discussions (arguments), and interacting. The social media hub is our opportunity to continue our online discussions in person. If you want a great list of engineers to follow, just check out who I follow.
  • Don’t be afraid to ask questions. We all come from a different background. Some of us are jack-of-all-trades, some of us specialize. We don’t expect anyone to be an expert in everything. We enjoy learning from each other. If you listen, and ask questions, you will learn.
  • Leave the oversized ego at home. Most of us have bigger personalities than egos. There are people in this group who know more than you. Trust me on this! If you show up with the goal of proving how smart you are, you’re going to have a bad time.
  • Don’t worship at the feet of your favorite author/personality. Yes, they will hang out with us and yes, they know an incredible amount about certain topics. Without exception though, they don’t want to be placed on a juvenile pedestal. They want to engage with other engineers. Story time:

Last year, I started a conversation with a well known author. We talked about our careers, about IT in general and the direction of technology. During these conversations, no less than 15 people approached to tell the author how great he was. The author was very happy to talk with them, and many times tried to draw the individual into our conversation. He would introduce me, mention the topic we were discussing at the moment, and made a genuine attempt to engage them in the discussion. Without fail, they thanked the author for his work, and then shyly withdrew. They were worshiping, not engaging.

  • Finally, register NOW! Register now to be certain you can attend the session that you want or need. This will also ensure that you can get an exam registered before all of the slots are filled. You can register here:

Cisco Live Registration

Geek Toys – Jabra Motion UC

Last week, I reviewed the Jabra Speak 450, which was provided by Jabra for a review.

Jabra Motion UC

Jabra Motion UC

This week, brings a review of the Jabra Motion UC. You will notice there is no disclaimer this week, as my Jabra Motion UC was supplied by my employer for testing, not by Jabra directly.

The obvious question is, why am I reviewing a product, when I have no obligation to do so? The answer is simple, because I REALLY like this bluetooth headset.

The model that I received included a dock/case, Jabra Link 360, and charging cable. The dock/case is quite ingenious, making it easy to store and travel with all of the accessories, while also providing a dock when at your desk. The case has traveled with me for a couple of trips, and has held up extremely well.

Battery Life

My average Tuesday is packed with meetings. I regularly have 8-10 meetings in a single day, all of them via phone, Lync, or Webex. With this schedule, the only time the headset goes into the charger is during lunch. The specs report 7 hours of talk time. While I have never tracked talk-time for a charge cycle, I have never found myself without battery.

Audio Quality

The loudness and clarity of the headset is very good. The noise rejection is also very good. The headset has two mics, which are back-to-back. With this setup, one mic is always used to pickup voice, the other is used for noise identification and isolation.


The headset fits behind and over the ear. Its fit and weight make it very comfortable. Once I adjusted to the fact that it never felt tight on my ear, I was suprised by how well it held on. Short of head banging to an 80′s hairband, its going to stay with you.

Improvement Needed

There are two things that I would like to see improvement in. The first is the way the headset is switched from ear to ear. The process requires spinning the rubber earpiece on it’s mounting surface. This isn’t easy to describe, and it isn’t easy to do. The second issue has to do with the volume control. The touch control sometimes requires multiple swipes before it responds; other times, a simple bump is all that is required.


Despite the two areas that I would like to see improvement in, this is the best bluetooth headset that I have owned out of nearly a dozen units. It is comfortable, the battery last long enough for an entire day, and the range is exceptional. Ultimately, if I were to leave my current employer tomorrow, I would buy a Jabra Motion UC.

Geek Toys – Jabra Speak 450 for Cisco

Jabra Speak 450

Jabra Speak 450

First, a confession. This review is WAY overdue. I have been slammed at work recently, and that has carried well over into my evenings and weekends. The good thing about being busy with my company is that it usually involves travel. When trying to review a Bluetooth speakerphone, travel is exactly what you need.

I received the Speak 450 from Jabra to review in early August. Since that time, I have tested it in quiet environments, in loud noisy construction zones, and in a couple of airports. The device is branded Cisco, so there is no doubt which products it should work well with. However, I tested it with Cisco IP Communicator, Skype, and Microsoft Lync, and found all three to function similarly well.

The design screams “Cisco”. While the Speak 450 comes in two colors, I received a grey device that matches Cisco endpoints well. The angled speaker directs sounds towards the user, and the large buttons responded as expected. The unit I received included a Jabra Link 360 bluetooth adapter. I tested with the adapter, and with standard bluetooth connectivity. Test systems included two MacBook Pro’s (2010 and 2013), a Windows 7 laptop (with Link 360 adapter), an iPad and an iPhone.

Battery Life

One of the most important aspects of a battery powered speaker is runtime. The spec sheet list a 15 hour battery life. I found this to be closer to 12 hours from my use. While that is a considerable difference, I honestly had to work to keep from accidentally charging it before running it down. Also, a great feature of the device is the ability to plug into your computer via USB, working even on a dead (recharging) battery. With this ability, I don’t think it is possible to be caught in a situation where the Speak 450 cannot be used.

Sound Quality

The sound quality of this device is very good. The speaker puts out a good volume level without distorting excessively. Users always stated that they could hear me clearly.

The secret to the microphone quality is the location of the microphone. It is located low and center on the device. It is designed to pick up audio that is bouncing off a table, or other hard surface. The spec sheet list a 120 degree coverage area, which means it rejects most unwanted room noise. This was key when working in an office that was in the middle of construction. As long as I had the speaker between me and the construction noise, so that the mic was pointing away from the source of noise, users couldn’t hear the sander, hammer drill or air compressor. This great sound rejection comes at a cost however.

My only complaint about the Speak 450 is that it can only be used by a max of 3 people. The coverage area fits three people OK as long as they are sitting around a table, relatively close together. When a fourth person is added to the mix, they are going to feel frustrated. The speaker points away from them, making it harder to understand, and they will be asked to repeat themselves regularly. If you are looking for a conference room mic for a standard 6-8 seat room, this isn’t it.


The Speak 450 from Jabra is well built, able to handle travel in a backpack without issue, provides very good audio quality and noise rejection, and has excellent battery life. While not ideal for large meetings, it is capable of handling 3 active participants with very good results. Would I buy it? Yes.

***Disclaimer – I received a Speak 450 from Jabra to review for this article. Jabra has asked for my opinion only. This post is entirely my opinion, without inference or editing by Jabra.***

Geek Tools – OpenGear ACM5004 Console Servers

While I was at Cisco Live, I was invited to sit in on a Tech Field Day event with OpenGear. This was my first Tech Field Day, and hopefully not my last. You can see the full video here:

Additionally, you can see a great blog post, written by Bob McCouch,
about the event here:

and Blake Krone’s take on the event here:

In short, OpenGear did a awesome job presenting a new product, the IM7200. They asked us about use cases, answered all of our questions, and impressed quite a few of us in the room.

After the event, I ended up speaking with their team about a couple of ideas that I had for their product. Based on that conversation, they were nice enough to make a unit available for testing. I received it a couple of weeks after Cisco Live, set it up on my network, and began playing.

For the past three to four weeks, I have been using the console server on my network, and trying to figure out what I wanted to write about it. I’ve started this post at least three different times, and each time scrapped the post after an hour of work. Why was it so hard to write about you ask?

Because this is one loaded device! This thing has EVERYTHING you could want on your network.

-RJ45 ports for connecting to console ports. No special cables, no adapters in most cases, no rollover cables. Plug one end of a straight-through cable into the console sever, and the other end into the console port of a switch or router, and away you go.
-In addition to standard console ports, the ports can be configured in a number of various ways. This should allow for connection to almost any device in your network.
-SSH, Telnet, FTP, TFTP, HTTP, HTTPS, DHCP, NTP, SNMP, DNS Server/Relay, and the list goes on.
-Once you have devices connected, you can access them various ways. SSH, Telnet, no surprises, right? How about a web terminal? Yes, it is that awesome.
-I/0 ports. These ports can be sensed (door sensors, environmental monitoring, etc) or set (activate a relay to release a door.) Imagine with me working on a remote site, you ask the user on the phone to walk over to the door. You unlock the door for them, and see when the door is ajar. You ask them to complete your task, and then to close the door. Does the user close the door, or hang out and play in your IDF? Well, now you know.
-USB Port. The usb port can be used for flash storage, or it can be used to connect to devices which only support USB console devices.
-Easy to set firewall rules. Do you only want SSH allowable outside of the trusted network? No problem. Settings are made with a checkbox.

I could keep going. I could mention the IPSec, OpenVPN, and DDNS options…but I won’t.

My gripes are pretty small with this device.
-The documentation and product CD push additional software (SDT Connector) for creating connections. Really, I don’t see the purpose. Connections to the ports are easily made over SSH (or Telnet if you like living on the edge) by specifing the correct tcp port; 300X for SSH and 200X for telnet, where X is the console port number.
-Because this device has SO MANY OPTIONS, I think some default options would make setup faster and easier. If you could select a group of ports and assign a Cisco Console Profile to them, and choose another group and assign a APC Environmental Monitoring Profile to those, setup would go much easier.

Ultimately, what you need to know is that this device is a Linux server. It is capable of doing anything that a small Linux server can do. What makes this such a compelling product is that Opengear has packaged all of the daemons and services that can be used in a network into a single simple to use form-factor. Let’s face it, we spend our day configuring complex network services. Our network and device management shouldn’t be

This isn’t the last that you will hear about my impressions with the Opengear ACM5004. I’m currently working on a use-case at work which I will write up in the near future. If you have any questions, let me know in the comments.

***Opengear provided an ACM5004 for this review. No other services or payment were received.***

Wireshark: Capture CDP and LLDP

A couple of years ago, I wrote a short piece about filtering CDP and LLDP packets using Wireshark. Since that time, I have simplified the way that I filter these packets, and based on feedback, and additional use of that information, I wanted to post an update. This will hopefully guide people to the best answer immediately. 


CDP sends all packets to the L2 multicast address of 01:00:0C:CC:CC:CC. Therefore, our filter can be:

ether host 01:00:0c:cc:cc:cc

However, VTP (VLAN Trunking Protocol) also sends packets to this address. Since the default timer for VTP is 300 seconds, and the default timer for CDP is 60 seconds, this shouldn’t be an issue. Additionally, since VTP packets are only sent out trunk ports, if you see VTP packets on a port that a user should be connected to, you may have just found your problem.


Link Layer Discovery Protocol, AKA 802.1AB, is an IEEE standard. While Cisco doesn’t support LLDP out of the box, it can be enabled on your Cisco gear. HP, Juniper, Dell, and everyone else that I have ever worked with supports LLDP by default. The L2 multicast address for LLDP is: 01:80:C2:00:00:0E. However, LLDP has the benefit of a unique EtherType. That type is: 0x88cc. Based on that information, we can filter with either:

ether host 01:80:C2:00:00:0E


ether proto 0x88cc

The default timer for LLDP seems to vary across vendors, although 30 seconds is the default for Cisco and quite a few others.

Wireshark Portable

If you are the roving type that walks out to the users desk, Wireshark can be ran as a portable app from a USB device.

Cisco IP Phones

Cisco IP Phones will send out CDP packets onto the PC port. What good does this do? I don’t know. However, hit the webpage hosted on the phone and you can find the CDP and LLDP info on the Network Statistics >Network page.


Embarrassing story time. Like a lot of engineers, I regularly use Wireshark to look at packet captures from other devices. After doing this for months, I needed to use Wireshark on my local LAN port. I started by spending 20 minutes trying to figure out why I wasn’t seeing CDP packets. Of course, once I remembered that I had a local firewall to contend with, I quickly fixed the issue, and haven’t made that mistake since. Don’t make that mistake. Disable the local firewall.