Recently I had an issue that I couldn't find a solution for using the power of Google. My company has a wonderful tool from BMC called ADDM. It's an enterprise tool that allows you to scan your network and discovery the things that live on the network. One of the configuration tasks is to provide the tool with a set of subnets to scan and when to scan. Unfortunately I can't do subnetting in my head and the list of subnets I did have were of all sizes. What I found out quickly was that I had overlapping subnets supplied to the application, this meant that some subnets were getting scanned multiple times a day which isn't ideal in the enterprise. I could get a simple CSV extract of all the scans I had configured and what subnets were in each but I couldn't find any tools that would allow me to load up that CSV file and identify the overlaps.
Thankfully I have a rather long background in development and after spending about an hour building it in Visual Studio 2013, I had a self-made tool that would load the extract of scans and subnets from ADDM and tell me where I had overlap. It took me about five minutes to remove the overlaps and I was done! All in, I had invested more time searching for a solution than it took to make my own! Just goes to show you how limited life can be if you don't have the ability to find your own solutions to life's problems.
For those who may use ADDM at work, or really anyone who has a list of subnets and wants to identify overlaps. The CSV file was a simple select all and extract to CSV from ADDM. I removed the header and made user all lines had quotes around the subnets. Format is below and I've attached the code to this post, you can find the .exe in the bin folder after you extract the zip. As always this is open to the world but unsupported, use at your own risk. Requires .NET 4 framework.
Each line should look like this (scan or subnet name a comma and then a comma delimited list of subnets in CIDR format with quotes around the list):
Subnet or Scan name,"one or more subnets comma deliminated in CIDR format 10.2.1.0/23, 10.20.1.0/24"
Last week I finally received my two new shiny blink(1) mk2 USB RGB "things"; these were rewards for helping fund the KickStarter project from ThingM. The mk2 is the second generation and even cooler version of thier RGB blink(1) devices. They are hackable USB powered indicators and I had a project in mind for one my mine which I jumped on right away. I wanted a way to indicate to cube mates when I was on the phone and shouldn't be disturbed (folks are always interrupting as they can't tell I'm on the phone before they barge in asking questions, awkward for all involved really). These blink(1) devices are the perfect fit for such a problem. I taped one up on my monitor, fired up Visual Studio and build myself a quick system tray applcation that will allow me to change the indicator color with a single click. The application also automatically switches the indicator when it detects I'm idle for 5 minutes. As soon as I interact with my computer again, the indicator automatically switches the indicator back. Super quick project and couldn't have been possible without the .Net library for the blink(1) by Jean-Francois Talbot and the great hardware from ThingM. As always source code is below and I've even recorded a quick video of the system working. Now to find a project for the other blink(1).....
Need to update multiple DYNDNS.org hosts on your Synology? Frustratingly you can't update multiple hosts with the GUI on a Synology. Once you select DYNDNS.org as your provider you'll see there is only the option to enter a single host to be updated. After you add that host, the option to select DYNDNS.org in the dropdown for the providers so you could add another record is gone. I was able to accomplish this with little effort and here's how you can to.
Since I'm attempting to host a few personal blogs on my Synology, I needed several different domain hosts to get updated. I only tested this using the same credentials with different hosts targets. You may very well be able to do this for different DYNDNS.org accounts if needed.
First, you need to make sure you have SSH enabled on your Synology (if not, google it). SSH into your box as root and type in the following command:
Now you should see the contents of the ddns.conf file on the screen. You'll want to copy all the values exactly except for the "hostname" line which should be changed to match the additional hostname you wish to have updated. You must also add a number the the block the update "[DYNDNS.org]" should become "[DYNDNS2.org]" and if you wanted a third hostname updated, "[DYNDNS3.org]", etc.
All done, go back to the GUI and open the DDNS service and you should see entries for all the hosts you manually entered. Hope this helps someone else who has a similar need as I did...
In my last post I talked about an issue my company had. We couldn't monitor our paging infrastructure from end-to-end and we couldn't find anybody selling anything that could. Before folks start yapping about pagers, you will see them in the healthcare sector for many more years to come when it comes to contacting a doctor for a life safety issue (cardiac arrest, etc) there is nothing currently sold that is as reliable and timely in the crowded RF world of a hospital.
I had built a prototype monitoring system using one of our pagers and an Arduino paired with a Windows Service. Well, it works and it works wonderfully so I was asked to build three more. Using multiple devices ensures we don't get false positives regarding a system outage due to the device or computer failing.
I've long been a fan of Adafruit and they were my first choice when I had my company order the parts needed to build out the rest of the monitoring devices. I leveraged the Arduino enclosure and the protoshield they sell and everything worked out wonderfully. I must say for a home-built gadget, they look pretty darn good and they perform wonderfully.
My apologizes for the quality of the pictures, had to use the cell....
Recently I was faced with an interesting challenge at work. How could I monitor our paging infrastructure (pagers, yes pagers, I work in healthcare) to ensure it was up and running 24 hours a day, 7 days a week? I had the ability to monitor certain portions of the system but no way to automate the monitoring of the end-to-end system, all the way out to the pager, keep in mind this technology is a one-way technology. My experience in the electronics hobby and having a developer background gave me an idea, I could attach the pager to an Arduino and write a Microsoft Windows service that would receive heartbeats and page received alerts via serial over USB and log those to a file that our enterprise monitoring system could watch. In fact, our enterprise monitoring system could send an email which gets converted to TAP via some SMTP-to-TAP software we have in use already.
So, the enterprise monitoring tool will send a page to our test pager, once the pager receives the page it'll notify the windows service using serial communications, which will in turn write the event to a log file (I could have used the event log). The Arduino will also send a heartbeat message every minute which also gets written to the log file. This will allow our monitoring tool to raise an event if the Arduino goes offline. We'll add some additional business logic in the monitoring software to page several times before opening up an incident but yes, I think this will indeed work and work quite well. How else is a company that is dependent on 1970 open-loop technology monitor it without something like this? I'm curious if others have solved a problem like this and how?
It didn't take me long to get a simple windows service built that listens on the specified COM port for serial messages from the Arduino. There are lots of examples of this being done, just google it. Hooking the pager up to the Arduino was also super simple, I just used the existing connection to the vibration motor on the pager and tied that to an analog pin on the Arduino. I also didn't want to have to bother with batteries for the pager so I hooked up a LM317 adjustable voltage regulator to supply the 1.5V the pager was expecting from the 5V on the USB line. After hooking everything up, I must say the system works quite nicely, we'll see how well it behaves long term but this project proves how useful a simple Arduino can be in the workplace. As always all the project files are attached to this post for everyone.
Till next time...
I've slowly been able to expand my home lab to include the type of equipment that allows me to continually improve my technical skills as well as experiment with home automation and DIY electronics. As my home lab has grown so has the need to ensure it's kept healthy. One way to ensure it stays healthy is to make sure it's got a nice comfortable habitat in which to work and live.
My first feeble attempt to monitor the environment where I keep my server rack was to buy a cheap-o temp and humidity meter from eBay. It worked in so much as I could tell what the temperature and humidity was if I bothered to go down to the basement and look. I'm lazy, heck I have IP KVMs so I don't have to go downstairs to reboot a server, I'm not going to go down there to check the environmental conditions. Something better had to be implemented....
I started looking for environmental monitors/sensors on eBay thinking I could pick something up cheap from one of the numerous companies that sell used computer equipment. Data centers are always upgrading such things and I was confident I'd get something to meet my needs for less than $100USD. Wow, I was ever so wrong. I found some things around the $100USD range but they typically required other pieces or sensors that costs as much or more. This was starting to suck.
Not sure why it took so long, but I finally remembered I had purchased a temperature and humidity sensor from AdaFruit.com many months back for a project I hadn't completed. I also remembered I had an Ethernet shield and I always have a few Arduinos on hand. I had struck gold, I'll build my on networked environmental sensor and I can do it for FREE (as I already owned all the pieces).
Thanks to AdaFruit.com's learning site, I was able to get my DHT22 temperature and humidity sensor working in just a few minutes but I needed some way to get to the data remotely over the network. I hooked up my Ethernet shield and started messing about with building a HTTP client and after a bit realized there had to be someone who had done this already. I found this article which leveraged the Ethernet shield to log the data to a cloud service which had a nice user interface for making sense of the data points I was capturing. Exosite was going to be a great, no fantastic solution! I downloaded the Arduino library for Exosite and I was done in about 30 minutes.
This is why I love Arduinos and the community of Arduino users. I was able to build an environmental sensor that was networked, captured historical data points and even has alerting features (via email) in about an hour and for about $75USD in parts.
Check out my Exosite portal here.
Now I've just got find a nice way to mount this in my rack and add a display for local viewing of the temperature and humidity for those times I actually am standing in front of the rack. But I'll save that for another post....
My example code and high resolution pictures can be downloaded below.