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Monthly Archives: October 2012
Increasing Wireless Network Speed By 1000% By Replacing Packets With Algebra
From Slashdot:
MrSeb writes“A team of researchers from MIT, Caltech, Harvard, and other universities in Europe, have devised a way of boosting the performance of wireless networks by up to 10 times — without increasing transmission power, adding more base stations, or using more wireless spectrum. The researchers’ creation, coded TCP, is a novel way of transmitting data so that lost packets don’t result in higher latency or re-sent data. With coded TCP, blocks of packets are clumped together and then transformed into algebraic equations (PDF) that describe the packets. If part of the message is lost, the receiver can solve the equation to derive the missing data. The process of solving the equations is simple and linear, meaning it doesn’t require much processing on behalf of the router/smartphone/laptop. In testing, the coded TCP resulted in some dramatic improvements. MIT found that campus WiFi (2% packet loss) jumped from 1Mbps to 16Mbps. On a fast-moving train (5% packet loss), the connection speed jumped from 0.5Mbps to 13.5Mbps. Moving forward, coded TCP is expected to have huge repercussions on the performance of LTE and WiFi networks — and the technology has already been commercially licensed to several hardware makers.”
Apple KB on Wireless
iOS: Recommended settings for Wi-Fi routers and access points
The following Wi-Fi base station (or Wi-Fi router) settings are recommended for all iPhone, iPad, and iPod touch devices. These settings will help ensure maximum performance, security, and reliability when using Wi-Fi.
http://support.apple.com/kb/HT4199
AirPort and Bluetooth: Potential sources of wireless interference
Interference may result in:
- A decrease in wireless range between devices.
- A decrease in data throughput over a Wi-Fi network.
- Intermittent or complete loss of connection.
- Difficulty during the discovery phase when pairing Bluetooth devices.
http://support.apple.com/kb/HT1365
iOS: Troubleshooting Wi-Fi networks and connections
Symptoms
When using a Wi-Fi network with your iPhone, iPad, or iPod touch, you may occasionally encounter the following issues:
- Unable to locate or join a nearby Wi-Fi network
- Weak or low Wi-Fi signal strength
- Connected to Wi-Fi network, but unable to access the Internet
Ask Slashdot: Why Does Wireless Gear Degrade Over Time?
http://ask.slashdot.org/story/12/10/21/1335208/ask-slashdot-why-does-wireless-gear-degrade-over-time
Lots of good comments here. I think those cheap radios burn out over time. Has little to do with the increase of the noise floor over time.
What’s new in 5.21 (2012-Oct-12 08:25)
*) route - fix dst-prefix filtering did not return routes when routes with
different routing-mark were present;
*) wireless - improved nv2 stability;
*) winbox & webfig - added simple new version downloading & upgrading panel;
*) dhcp server - immediately store to disk changes for lease configuration;
*) lcd - improve graphs screen
*) lcd - improve touch screen (must /lcd reset-calibration)
*) smb - fix smb share mounting on linux systems
*) ovpn - fixed memory leak on disconnects;
*) userman - fix unpaid profile activation while authenticating;
*) sstp - fix high CPU usage on SSL handshake;
*) winbox - added ability to add time & date to dashboard;
*) metarouter - fixed lockups on RB110AH;
*) metarouter - fixed occasional lockups on RB450G;
*) ups - fixed problem connecting to USB device, introduced in 5.20;
*) quickset - added Wireless PTP Bridge mode;
*) fix MPLS MTU configuration usage;
*) dns - fix empty response;
Download
First world iPhone 5 problems
SNL Tech Talk
“You ask to go to Starbucks but it take you to dunkin donut!”
MUM Videos live!
In case you were too busy chatting up people and missed some of the presentations, or you just weren’t there here are the MUM 2012 NOLA videos.
Video from MUM 2012 NOLA
Video from MUM 2012 NOLA
WordPress RouterOS Syntax Highlighting
When looking for a syntax highlighting solution for WordPress I asked a few people. I also did the Google thing and searched. I came across a plugin that looked promising called SyntaxHighlighter Evolved by Alex. It uses the SyntaxHighlighter JavaScript package by Alex Gorbatchev . It’s what WordPress uses in their hosted solution.
Anyways, it supports brushes which allow you to extend the highlighting to additional languages. Someone had already made a Brush for RouterOS for the JavaScript package, but in order to use it it with the WordPress plugin it had to be packed into it’s own plugin which I’ve done. I improved the brush by adding more keywords from the Notepad++ syntax highlighter from the Mikrotik forums and Andrew’s blog.
I still need to test all the keywords, and add custom highlights that match WinBox coloring.
Here it is:
syntaxhighlighter-routeros 1.0.0
- Install SyntaxHighlighter Evolved.
- Install this plugin.
- Use [ros] and [/ros] around your code.
Optimized wireless for Macs and iOS on Mikrotik
The iPhone 5 now has 5 GHz wireless built in. The original iPad has it as well. Lot’s of Macs have had it for a while. If you want the fastest speed for your Angry Birds updates switch to 5 GHz.
Since Mikrotik’s are DIY configuration which settings actually helpful?
From my research I’ve found that Apple devices like the following:
- Long preamble.
- WPA2 with AES and no TKIP.
- Macs and iOS devices only support HT20 on 2.4 GHz but support both HT20 and HT40 on 5 GHz.
I would not recommend using HT40 in 2.4 GHz regardless.
/interface wireless security-profiles add group-ciphers="" supplicant-identity=MikroTik unicast-ciphers="" \ add authentication-types=wpa2-psk eap-methods=passthrough \ management-protection=allowed mode=dynamic-keys name=WPA2_profile \ supplicant-identity="" wpa2-pre-shared-key=mustbe8char /interface wireless set 0 band=2ghz-b/g/n bridge-mode=disabled disabled=no frequency=2437 \ ht-rxchains=0,1 ht-txchains=0,1 l2mtu=2290 mode=ap-bridge multicast-helper=\ disabled name=2.4 preamble-mode=long rate-selection=legacy \ security-profile=WPA2_profile ssid=TwoGhz wireless-protocol=802.11 \ wmm-support=enabled set 1 band=5ghz-a/n bridge-mode=disabled channel-width=20/40mhz-ht-below \ disabled=no frequency=5200 ht-rxchains=0,1 ht-txchains=0,1 l2mtu=2290 mode=\ ap-bridge multicast-helper=disabled name=5.8 preamble-mode=long \ rate-selection=legacy security-profile=WPA2_profile ssid=FiveGhz \ wireless-protocol=802.11 wmm-support=enabled
iPhone 5 on 5 GHz HT40