Technology Insights

Modify Opera Bit Torrent Configuration Settings, Modify Opera Web Browser Settings

Typically when I want to modify a setting related to one of the browsers I use I open the main Preferences configuration window, navigate to the correct sub section, make the modification, and then save the new browser configuration setting. Opera does have a typical Preferences configuration window however I was initially unable to locate the torrent settings from within the that Preferences configuration window so I had to do a little more digging to find out where to modify the Opera Torrent Settings. Below I display the default Opera Preferences window where I could not find the Torrent Settings and then the proper way to modify the Opera web browser torrent settings.

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.

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:


  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. .