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wireless Archive

May 9, 2012 @ 22:23

Maximum wifi speed with OpenWRT? (802.11a Turbo mode aka Super A)

 
Hi, we have been testing what is the absolute maximum speed over wifi when using openwrt, for out test we used this hardware:
 
- 2 x Ubiquity Router station
- 2 x Wistron CM9 802.11a/b/g mini pci cards
- 2 x 3dBi omni antennas
 
- openwrt version – backfire 10.03.1
- wifi driver – madwifi
- distance – 2 meters (same room)
- encryption – psk2
 
For benchmarking we installed iperf package and used default settings (tcp packets in one direction).
 
First we tested “plain” 802.11a mode (hwmode 11a) on channel 40 and we got 30-35Mbit speeds.
 
Then we switched to 801.11a turbo (hwmode 11ast) and got 55-60 Mbit speeds.
 
Is this the maximum speed possible? Are there any other tweaks we can do to get faster speeds?
 
Did you get faster speeds? How? Which gear did you use? We didn’t make results artificially better by using udp packags, my guess by using udp packages we could get near 100 Mbit speeds.
 
Are there any openwrt tutorials for tweaking and benchmarking maximum speed?
 

Filed under linux, wireless · No Comments »

February 9, 2012 @ 12:41

Snježni wifi kraljevi

Od danas Hrvatska uz natjecanje Snježna kraljica ima još jedno novo natjecanje a to su Snježni wifi kraljevi ;)
 
U natjecanju mogu sudjelovati svi zainteresirani, cilj je u što ekstremnijim uvjetima postaviti što više nove wifi opreme na krovove zgrada. Pravila su jednostavna a nagrade neprocjenjive.
 
Pogledajte kako je bilo u Osijeku prvom timi iz ekipe OsijekWirelessa koji su se okušali u ovome novome sportu na ovome online albumu.

 

Filed under croatian, diy, wireless · 2 Comments »

August 25, 2011 @ 8:14

OpenWRT installation from Tomato

 
I have an older Linksys WRT54GL v1.1 with Tomato firmware. Although I’m a hardcore Linux geek I never used OpenWRT, yeah, I know – shame on me ;)
 
OpenWRT wiki has installation instructions that explain how users should first install 2.4 linux kernel based image, set some nvram options, and then install or update to latest 2.6 based firmware image, but WIKI has no links how to do an update.
 
Read rest of story…

Filed under diy, gadgets, linux, tips&tricks, wireless · 5 Comments »

July 4, 2011 @ 17:30

Google caught cheating in Android@Home demo

 
You would expect that Google will use Android@Home protocol in it’s Android@Home demo [1], right?
 
Well it looks like Google got caught cheating. It looks like Google has actually used equipment from Synapse Wireless [3] and their protocol called Snap [4], and not their own, in-house developed Android@Home protocol.
 
Why did they do that? My guess is that they have limited developer resources who could code such a complicated protocol and wanted to do field survey how would press, other companies and general public react before they pored expensive development hours into questionably interesting product.
 
Nice try Google, but it is still cheating.
 
I would like to share comment from LinuxMCE [5] (most advanced smart home solution and it runs in Linux) forums by Darren:
 
“Interesting…. but Google would have to buy it and open it up a bit more for it to provide a real alternative.
From the Synapse website “Synapse Wireless Inc. provides patented hardware and software technology that helps tie together devices for remote monitoring and control.”
So in terms of an application layer free of patents – not at the moment. But perhaps Google will but the company, open source the stack and donate the patents to one of the open consortium’s.
We’re still in for a bit of waiting it seems.”
 
I really hope that either Google buys Synapse Wireless and releases it’s patents to one of open consortium’s or does so with their own (hopefully in development) Android@Home protocol.
 
[1] Android@Home demo at Google Keynote
[2] Google’s Android@Home – The plot thickens…
[3] Synapse Wireless
[4] Snap protocol
[5] LinuxMCE

Filed under english, gadgets, wireless · No Comments »

February 17, 2010 @ 9:55

Which wireless driver does your wireless card uses on Fedora and Ubuntu?

 
If you have a new Fedora user (or user of any other distro) who has problems using his wireless card first thing you need is for him to tell you which wireless card he has and which wireless driver his card uses. For experienced users this is trivial and can be done in several ways. I found that this can be a bit tricky for new users and there isn’t one simple command that displays ONLY this information.
 
This one liner seams to do the trick for PCI wireless cards:
 
lspci -k|grep -i -E “wireless|wlan|802.11″ -A 2
 
UPDATE:
 
Also try this command:
lshw -class network |grep -i ‘description: wireless’ -A 11
 

BROADCOM:
30:00.0 Network controller: Broadcom Corporation BCM4311 802.11b/g WLAN (rev 01)
	Kernel driver in use: b43-pci-bridge
	Kernel modules: ssb

INTEL:
02:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG
Network Connection (rev 02)
	Kernel driver in use: iwl3945
	Kernel modules: iwl3945

ATHEROS:
01:00.0 Ethernet controller: Atheros Communications Inc. AR242x 802.11abg
Wireless PCI Express Adapter (rev 01)
	Kernel driver in use: ath_pci
	Kernel modules: ath5k, ath_pci

INTEL:
3:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or AGN [Kedron] Network Connection (rev 61)
     Kernel driver in use: iwlagn
     Kernel modules: iwlagn

 
I tried this with Intel, Atheros and Broadcom wireless cards. Do you know of a better way to do this? How would you do this for USB wireless cards?
 

Filed under linux, tips&tricks, wireless · 10 Comments »

May 29, 2009 @ 13:40

Fedora 11 fail because of Anaconda :(

I have tested Fedora 11 alpha, beta and now preview releases on few of my laptops and I’m really impressed by how Fedora 11 works once it is installed.
 
The problems I’ve encountered are those within the installation part – it seems like anaconda installer has become much worse than it was in Fedora 10 and in previous versions.
 
I watched how OpenSuse and Ubuntu teams have really polished their installers and hoped that Fedora 10 or 11 would have some more polish in GUI because if you just look at OpenSuse or Ubuntu screenshots you will see how outdated Fedora’s anaconda installer looks in comparison to them. I agree that in Fedora 10 there was no feature that lacked (except installer failed on Asus eee 701 laptops) but I really hoped that GUI would get a fresh look also, it really needs one general overhaul, especially in partitioning part of the installer. The inner working of anaconda previous to Fedora 11 was in top shape so that is why I was so surprised how bad anaconda is performing in Fedora 11 Preview release!
 
The only way to install Fedora 11 is to leave the default settings while in partitioning part of the installer. If you try ANY option with existing partitions on the hard drive, it will just crash the installer! I didn’t find any way how to create custom partitions in anaconda installer, delete partition or delete the whole disk without installer crashing on me. Are you looking how to create custom LVM partitions? Forget it. Encryption? No way. If you have hard drive with no partitions the chances are 50:50 for your installer not to crash, and again, you can’t erase the hard drive without installer crashing :(
 
Read rest of story…

Filed under english, fedora, gadgets, linux, wireless · 13 Comments »

October 4, 2008 @ 21:06

Für Elise – not on Fedora :(

Für Elise - not on Fedora :(
 

I’ve been trying for some time use Elisa media center on Fedora but it seams that Elisa is too elusive for Fedora. Current version on Elisa home page is 0.5.12 but if you install Elisa on Fedora 9 you will get much older 0.3.2, even bigger issue is that Elisa doesn’t work because of some broken dependencies.
 
You can look at Fedora Bugzilla; more specifically look at bugs #446051 and #429590.
 
So I guessed that there will be some “break my Fedora box” packages in F9 updates-testing repos, but unfortunately there were none :(
So I booted Fedora 10 beta – this is the bleeding edge Fedora so I thought there had to be new Elisa package in F10, but guess what? Fedora 10 also has old Elisa 0.3.2 which doesn’t work.
 
I also tried manually getting packages from freshrpms testing repo, I downloaded and saved all the rpm packages and tried to install them but there were some unmet dependencies :(
 
I tried installing pigment-python-0.3.8-1.fc9.i386.rpm but that packet needs libpigment-0.3.so.8, libpigment-gtk-0.3.so.8 and libpigment-imaging-0.3.so.8 but pigment-devel-0.3.9-1.fc9.i386.rpm packet provides only so.7 but no so.8 libraries…
 
I hope these issues will get sorted out as soon as possible. I’m willing to test Elisa packages and help that way so that working and updated Elisa gets into Fedora 10 repositories.
 
UPDATE:
I found out how you can install elisa on Fedora 9 thanks to thm on #fedora-devel irc channel, and it isn’t too hard.

First you need to setup freshrpms repository; just copy the code below, but you need to remove [ ] around etc because my blog has protection that prevents me to write that path.


su -
cat < /[etc]/yum.repos.d/freshrpms-testing-elisa.repo
[freshrpms-testing-elisa]
name=Freshrpms Testing (elisa)
baseurl=http://ftp.freshrpms.net/pub/freshrpms/fedora/linux/testing/$releasever/elisa/$basearch
gpgkey=http://ftp.freshrpms.net/pub/freshrpms/RPM-GPG-KEY
enabled=1
EOF

 

and then just install elisa:
 

yum --enablerepo=freshrpms-testing-elisa install elisa

 

Links:

Filed under english, gadgets, linux, pc hardver, wireless · 2 Comments »

May 20, 2008 @ 12:40

Madwifi wireless for Asus Eee PC on Fedora 9 HowTo

fedora 9 wireless on eee pc
 
Im this tutorial I will show you how to download patched driver and compile it yourself, but first I would like to explain why wireless drivers aren’t working on Eee PC running Fedora 9.
 

Asus Eee PC uses Atheros wireless chip AR5007. Atheros as a company doesn’t support linux and doesn’t make linux drivers available, there are linux drivers but they are made by madwifi project crew. Atheros company doesn’t make any effort in making their wireless chips work on linux; they hide specifications of their wireless chips and don’t make them available to linux developers. It is amassing that a developers around madwifi project actually succeed in making these drivers considering all the obstacles. Madwifi drivers still needs Atheros binary HAL (Hardware Abstraction Layer).
 

This HAL is not binary firmware but a piece of code that needs to run in the Linux kernel. It consists of header files for which no permisison to modify is granted, and pre-compiled object files. The vendor’s position is that the Linux community simply needs to accept this sourceless HAL, since in principle the Atheros chip could be tuned to any frequency, and thus produce RF interference with systems operating in those frequencies. This binary HAL is unacceptable to the Linux kernel developers, and the madwifi driver in this state will never become part of the official kernel.
 

Some OpenBSD developers, facing the same issue, reverse-engineered the binary HAL and have produced an open source driver (ath5k), which has now been picked up by the madwifi team as the future direction. At the same time the madwifi driver has been labeled ‘legacy’ to reinforce this point.
 

So we have two drivers that support Atheros chip based wireless cards; madwifi and ath5k, but neither of them currently supports the chip that Asus choose for Eee PC – AR5007. That is now true, you say, my Eee PC runing Xandros linux has a working wireless! If you weren’t aware Xandros uses NDISwrapper to load windows drivers (to learn more look at NDISwrapper article on Wikipedia). So Xandors is using windows and not linux wireless drivers.
UPDATE: I checked with lsmod and Xandros also uses madwifi (ath_pci) driver. They have also custom patched the driver to work.
 

athk5 driver is under heavy development and it is now known when it will support AR5007. Madwifi has a patch that adds support for AR5007, but unfortunately this patch cannot be committed to madwifi, since it breaks the ABI for all non-i386 HAL binaries.
 

In order to get your wireless working on Eee PC with madwifi you need to patch the driver manually so here is step by step walktrough:
Update: Im this tutorial I will show you how to download patched driver and compile it yourself.
 
Update 2: If you don’t wan’t to compile the driver manually then you need to configure Livna repository and then just issue yum command to install the driver.
As root do this:
rpm -i http://rpm.livna.org/livna-release-9.rpm
yum --enablerepo=livna-testing install kmod-madwifi
 

If you still want to do it manually and perrhaps learn how to do it then you need to install all necessary packages; as root do:
yum install make binutils gcc glibc-devel glibc-headers libgomp patch kernel-headers kernel-devel wget
 

Then blacklist the ath5k module; edit your blacklist file (as root) in \etc\modprobe.d\blacklists (I have to reverse slashes because mod_security on this blog that prevents writing \etc\ with regular slashes) and add the line with “blacklist ath5k”
echo "blacklist ath5k" >> \etc\modprobe.d\blacklist (reverse the slashes)
 

You should also edit your \etc\modprobe.conf to look like this:
## Start Atheros Stuff
alias wifi0 ath_pci
alias ath0 ath_pci
options ath_pci autocreate=sta
## End Atheros Stuff

 

Download patched madwifi driver:
wget http://snapshots.madwifi.org/special/madwifi-nr-r3366+ar5007.tar.gz
 

Extract madwifi source code and compile it:
tar xvf madwifi-ng-r2756-20071018.tar.gz
cd madwifi-nr-r3366+ar5007
make
su
make install

 

That is it, after reboot you have a working wireless under Fedora 9.
 

Links:

Filed under english, fedora, linux, tips&tricks, wireless · 15 Comments »

August 6, 2005 @ 12:09

Novi svjetski daljinski WIFI rekord

OpenSuSE"

Na ovogodišnjem Defconu održano je paralelno wifi natjecanje u dometu signala; Defcon Wifi-Shootout. Postignu rezultat od 200 km stvarno je vrijedan svake pohvale tim više što nisu dobili jedva neki signal nego punu brzinu od 11Mbita!!! Koristili su ne tako standardnu opremu poput satelitskih tanjura promjera cca 3m :) Svaka pohvala ekipi iFiber Redwire jer je ovo stvarno izuzetan poduhvat koji svima nama koji se bavimo wifi tehnologijom daje inspiraciju da i sami eksperimentiramo. Baš me zanima što će napraviti nagodinu. :)

Filed under wireless · 1 Comment »

July 13, 2005 @ 10:44

Naučite krimpati kabele

Bez

Ima čak među samoproglašenim guruima wirelessa onih koji ni kabel ne znaju skripmati kako treba, nećemo ih sada spominjati :) Njima, a i svima drugima dobro će doći ovaj link. Gore su video tutorijali za krimpanje konektora na koaksijalne kablove koje koristimo u bežičnim mrežama (pigtailovi).
UPDATE: Ako želite nakrimpati “običan” lan kabel (CAT-5) onda vam preporučam ovu odličnu stranicu. A na ovome linku naći ćete puno informacija o kabelima, konektorima i svemu i svačemu…

Filed under wireless · 3 Comments »

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