THE BLOG ★ Ramblings on WiFi & stuff.

Ep. 004: PCAP'n with Eddie! Multi Channel Wireless Packet Capture on the LINUX!

Now we move on to Linux! Learned myself how to do multi-adapters on Ubuntu with Wireshark. I am sooooo excited!😬 There's more. ⬇

Ubuntu 2019.3

Wireshark 3.0.5

Netgear A6210

HANDY COMMANDS:

INSTALL AIRCRACK-NG

sudo apt-get update

sudo apt-get install aircrack-ng

SET NICS TO MONITOR MODE

sudo airmon-ng check (Checks for possible interfering processes.)

sudo airmon-ng check kill (Kill ‘dem processes!)

sudo airmon-ng start interface-name (Start monitor mode)

sudo airmon-ng stop interface-name (Stop monitor mode)

START NETWORK MANAGER

sudo systemctl start NetworkManager.service

REMOVE AVAHI-DAEMON

sudo apt purge avahi-daemon

CAN'T CAPTURE IN WIRESHARK?! 😱

sudo dpkg-reconfigure wireshark-common
(press the right arrow and enter for yes)

sudo chmod +x /usr/bin/dumpcap

Add a Custom AP + Antenna Combination in Ekahau

Shout out to @WiFiNigel for helping me figure this one out. I'm sure there are other folks out there that have figured this out, but I never did... until now.

So, I'm in the middle of a design in Ekahau Site Survey (ESS) for a fairly large manufacturing facility (about 1.2 million square feet) and I'm using a specific AP with various antennas types depending on the use-case at the facility.

When you place an AP in ESS the next time you place a new AP on the map it uses the last AP you placed, and it saves you previous configs such as TX power, antenna hight, and angle. However, if you customize an AP - like I did - by selecting an AP from the dropdown and then changing the antennas to a 3rd party antenna -the next time you place an AP it DOES NOT use that - it uses the default from the dropdown.

This is a bummer if you're a.) adding a lot of APs, and/or b.) are switching between antennas types (like say a patch for racks, and dipoles in open areas, etc). Every time you place an AP you have to manually go in and change EVERYTHING - the TX power, the antenna hight, the angles, and of course - the antennas themselves.

I knew you could make changes to the ESS conf files for adding custom antennas and APs, but I had never actually done that - until now. I edited the "accessPointTypes.xml" file and added the AP with the antennas I wanted. The antenna already existed in ESS, it just wasn't paired with the AP I wanted to use. I figured this was all I needed to do to get it to work.

Upon opening my project file in ESS I saw that the new customized version of the AP was there in the list! (Yay!) But, when I placed it I saw only the generic antennas matched with it. (Boo.)

Nigel then made the brilliant observation that I may just need to look at the antenna conf files and add the AP + ANT combination there - and when I looked at the antenna files I noticed that's exactly what Ekahau did. They had AP + the 2.4 and 5 GHz versions of the antennas there:

So, it was quite simple really - I just copied each of the antenna files I wanted (2.4 and 5 GHz) and then pasted them back into the same folder. Now I had version of each (with the "copy" appended at the end) and all I had to do was rename the file by adding the AP name "+" the antenna name and remove the "copy" at the end. I then edited the "accessPointTypes.xml" again, this time I used the name of the antenna file as the name of the AP and saved the file.

Lo, and behold, when I restarted ESS, there it was! When I added the AP it had the correct antennas for 2.4 and 5 GHz, and when I added the next AP it matched the antennas as well as all the setting changes I made for the first one (TX power, ANT height, angle, etc.). I was pretty stoked - so I wrote this blog.

So, if you have a project where you have lots of APs with a 3rd party antennas, and don't want to edit EVERY. SINGLE. ONE - try this:

* NOTE: This is NOT the "Custom AP" that shows up in ESS. You should never use that.

This is for creating your own existing AP and Antenna combinations.

When you add an AP and change the antennas type in Ekahau, the next time you add the AP it will not have the same antennas, or settings. You have to manually edit the AP everytime you add it if it's not a combination that already exists in the dropdown.

You can edit the config files for antennas and APs so that you can create custom AP/ANT combos for use in all of your projects.

* EDIT 05-31-2016  I forgot to mention that you'll need admin rights to edit anything in that folder. Just right-click on the folder and give yourself full-rights.

*IMPORTANT! @WJComms on the Twitters made a good point: BACKUP YOUR CONFIG FILES AFTER YOU EDIT THEM. If you don't they'll be written over when you update ESS and you'll lose your changes. Back them up somewhere else and copy the changes to the updated config files after you update.