Wednesday, November 19, 2014

Eduroam

I've recently learned about the Eduroam service and I must say it is a cool idea. Basically, a bunch of schools got together to allow wireless access at each other's locations:
"The eduroam initiative started in 2003 within TERENA's Task Force on Mobility, TF-Mobility. The task force created a test bed to demonstrate the feasibility of combining a RADIUS-based infrastructure with 802.1X standard technology to provide roaming network access across research and education networks. The initial test was conducted among five institutions located in the Netherlands, Finland, Portugal, Croatia and the UK. Later, other national research and education networking organisations in Europe embraced the idea and gradually started joining the infrastructure, which was then named eduroam. 
eduroam allows any eduroam-enabled user to get network access at any institution connected to eduroam."
So say, I was a student at the University of Tennessee here in Knoxville. If I were to visit London, I would be able to connect to the LSE's (and many other's) wireless network. That's pretty slick.


Tuesday, November 18, 2014

CWNP: CWTS - Service Sets

My study guide/notes... my definitions may not be perfect, but they help me with concepts.

Service Set (SS) - all the devices connected to a wireless LAN.

Basis Service Set (BSS) - a single access point and all of its connected devices

Independent BSS / Ad Hoc / Peer-to-peer - devices talk to each other without a central authority like an access point

Infrastructure BSS - an access point that connects to a larger distribution network

Extended Service Set (ESS) - a collection of BSS that are working together to provide wireless service in an area

Basis Service Set Identification (BSSID) - the MAC address of the access point

Service Set Identifier (SSID) - the unique identifier for a BSS or ESS, what we commonly call the name of the wireless network

Intel Wireless AC 7260 Problem and Work-around

I got a new laptop at work and it has the Intel AC 7260 wireless card. Apparently, it does not like our AC access points here. With the default settings, my iperf tests look like this:

iperf\iperf.exe -c server -r -i 2 -w 524288
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size:  512 KByte
------------------------------------------------------------
------------------------------------------------------------
Client connecting to server, TCP port 5001
TCP window size:  512 KByte
------------------------------------------------------------

[ ID] Interval       Transfer     Bandwidth
[  4]  0.0- 2.0 sec  24.0 MBytes   101 Mbits/sec
[  4]  2.0- 4.0 sec  24.1 MBytes   101 Mbits/sec
[  4]  4.0- 6.0 sec  30.2 MBytes   127 Mbits/sec
[  4]  6.0- 8.0 sec  30.8 MBytes   129 Mbits/sec
[  4]  8.0-10.0 sec  28.1 MBytes   118 Mbits/sec
[  4]  0.0-10.0 sec   137 MBytes   115 Mbits/sec

[  4]  0.0- 2.0 sec  6.67 MBytes  28.0 Mbits/sec
[  4]  2.0- 4.0 sec  6.87 MBytes  28.8 Mbits/sec
[  4]  4.0- 6.0 sec  4.33 MBytes  18.2 Mbits/sec
[  4]  6.0- 8.0 sec  6.17 MBytes  25.9 Mbits/sec
[  4]  8.0-10.0 sec  6.05 MBytes  25.4 Mbits/sec

[  4]  0.0-10.1 sec  30.4 MBytes  25.2 Mbits/sec

If I change the HT Mode from VHT Mode (AC) to HT Mode (N) in the driver properties, then my results get much better.

[ ID] Interval       Transfer     Bandwidth
[  4]  0.0- 2.0 sec  33.4 MBytes   140 Mbits/sec
[  4]  2.0- 4.0 sec  30.6 MBytes   128 Mbits/sec
[  4]  4.0- 6.0 sec  33.0 MBytes   138 Mbits/sec
[  4]  6.0- 8.0 sec  33.0 MBytes   138 Mbits/sec
[  4]  8.0-10.0 sec  34.4 MBytes   144 Mbits/sec
[  4]  0.0-10.0 sec   164 MBytes   138 Mbits/sec

[  4]  0.0- 2.0 sec  25.8 MBytes   108 Mbits/sec
[  4]  2.0- 4.0 sec  30.9 MBytes   130 Mbits/sec
[  4]  4.0- 6.0 sec  29.6 MBytes   124 Mbits/sec
[  4]  6.0- 8.0 sec  30.7 MBytes   129 Mbits/sec
[  4]  8.0-10.0 sec  31.3 MBytes   131 Mbits/sec
[  4]  0.0-10.0 sec   149 MBytes   124 Mbits/sec

I see the same sort of results with Speedtest.


Monday, November 17, 2014

Trouble with Tribbles GIF

Pretty funny GIF version of the Trouble with Tribbles episode.

Via Ace of Spades

Funny?

Is it just me or are these not funny? I like to pick on users as much as the next IT professional, but so many of these sound like the urban legends of the IT world.

I'm trying to come up with some funny stories of my own, but I'm struggling. I remember the lady that set her coffee on top of our AS/400, but that was more cringe inducing than funny.

Another lady was mad because the replacement for her corded mouse, a wireless mouse, would slide off her angled keyboard tray. Sorry we couldn't bend the rules of gravity for you there. That story was more about how to deal with a difficult users. This lady was very direct and I had to be blunt/tough with her right back. That's just the way she worked.

I'll think on this some more and maybe I can recall an actual funny one.

Baofeng UV-5R: Feature

These things sure are full featured - they even act as a remote for auto-opening garbage cans.

Part 90 v Part 95: Fight!

KD0TLS on Part 90 and Part 95 radios:
"Hopefully, I've narrowly averted the total collapse of Western civilisation by offering a legal alternative. It all starts with some guy in Plymouth using a TH-9000 on GMRS. Next thing you know, we're all killing each other because the law has lost its meaning."

Sunday, November 16, 2014

Stealing this, too.

"Yesterday, My XYL said she'd leave me if I didn't give up ham radio. Over."

Saturday, November 15, 2014

Stealing This

"I started reading the internet, and I just couldn't put it down!"
Stolen from Althouse

Blog Birthday

I  was thinking it was today, but actually yesterday was four years of blogging... 2,693 posts and 1,584,674 hits.