Technology Insights

Tshark: Strip WPA Wireless Captures by ESSID with Tshark

A while ago I wrote a short tutorial on how to strip down a wireless capture which contained a wpa handshake so that only eapol packets and beacon frames where left. I have since found a little bit better way to do it so I decided to make a new post. In the previous article I showed how to strip by wlan.mgt frames containing the mac address. The problem with this is that it strips out lots of other packets which some programs use to check for ESSID.  I looked into the issue some more and found a way to strip just by essid.

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Technology Insights

Configure: error: Your operating system’s lex is insufficient to compile libpcap

This morning I was attempting to upgrade libpcap on a Cent OS server to a newer version.  I decided to get the newest version of libpcap from git.

When running the configure script I received the following error:

bash

  1. checking for flex... no
  2. checking for bison... no
  3. checking for capable lex... insufficient
  4. configure: error: Your operating system's lex is insufficient to compile
  5. libpcap.  flex is a lex replacement that has many advantages, including
  6. being able to compile libpcap.  For more information, see
  7. http://www.gnu.org/software/flex/flex.html .
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Technology Insights

Set Opera Web Browser To Update Automatically Or To Notify Of New Opera Updates Only

As of Opera 10 you can set Opera to update automatically, notify of updates only, or to not even check for updates. I don’t use Opera daily however I probably do use it at least once a week for various tasks such as torrent downloads. Recently when I launched Opera it let me know that an update was available and asked if I wanted to download and install. I quickly clicked yes to upgrade Opera but realized that there was another option that was checked to upgrade Opera automatically in the future. I personally like to be notified about upgrades and then run the upgrade myself when it is convenient so I needed to modify this setting back to only notify me of new Opera updates. Below are instructions on how to set Opera web browser to upgrade automatically, notify you of Opera browser updates, or to not even check for new updates available for the Opera web browser.

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How to Completely Remove Microsoft Office 2007 Registry Entries After a Failed Uninstall

Today I had a computer brought in where some basement Craigs list technician  had installed a hacked version of Microsoft Office on a womans computer and she was getting a error message saying it was not genuine. She brought it in to me along with a fresh new copy she had purchased and asked me to install it.  I tried to install it over the hacked copy but I kept getting all kinds of install errors in Spanish or Portuguese or some thing. I then tried to remove the hacked copy and got the same errors along with some that said “Your computer does not support the language of the uninstaller”. After a frustrated morning I found a tool which removes all traces of Office 2007 from the registry and makes it possible to delete the folder afterwards or use a 3rd party uninstaller program.

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