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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Network-and-equipment’ Category

Dean Bubley’s Disruptive Wireless: Debunking the Network QoS myth

Posted by jpluimers on 2019/08/09

QoS doesn’t work, except for one specific scenario:

Where QoS works is where one organisation controls both ends of a connection AND also tightly-defines and controls the applications:

  • A fixed-broadband provider can protect IP telephony & IPTV on home broadband between central office & the home gateway.An enterprise can build a private network & prioritise its most important application(s), plus maybe a connection to a public cloud or UCaaS service.
  • Mobile operators can tune a 4G network to prioritise VoLTE.
  • Telco core and transport networks can apply differential QoS to particular wholesale customers, or to their own various retail requirements (eg enterprise users’ data vs. low-end consumers, or cell-site timing signals and backhaul vs. user data).
  • Industrial process & control systems use a variety of special realtime connection protocols and networks. Vendors of “OT” (operational technology) tend to view IT/telecoms and TCP/IP as quaint. The IT/OT boundary is the real “edge”.

Source: [WayBackDean Bubley’s Disruptive Wireless: Debunking the Network QoS myth

Via: [WayBack] This is not news, but it’s worthwhile repeating… – Kristian Köhntopp – Google+:

This is not news, but it’s worthwhile repeating: it is actually cheaper to build a network that can carry the traffic than building a network that keeps quality promises on a backbone that is undersized or close to capacity. Overprovisioning works, everything else does not, economically as well as technically.

–jeroen

Posted in Network-and-equipment, Power User, QoS | Leave a Comment »

IKEA TRÅDFRI lamps [1] when equipped with Firmware >= 1.2.217 integrate with Philips Hue and vice versa…

Posted by jpluimers on 2019/08/05

Reminder to self [WayBack] Just a small FTR. Yes, the IKEA TRÅDFRI lamps [1] when equipped with Firmware >= 1.2.217 intergrate seamlessly into the Philips Hue system, thanks to t… – Jan Wildeboer – Google+:

  • IKEA lamps integrate with Philips Hue
  • Philips Hue lamps integrate with the
  • IKEA lamps pair to the remote that you paired with the gateway before: no need to bring the lamp close to the gateway first
  • Philips tries the same
  • Remotes have a 10-decide limit

Links:

–jeroen

Posted in IoT Internet of Things, LifeHacker, Network-and-equipment, Power User | Leave a Comment »

Sonoff Wireless Switch Family Gets a $3 IP66 Waterproof Enclosure

Posted by jpluimers on 2019/07/15

Interesting stuff from a while back that I will be using soon: [WayBack] Sonoff Wireless Switch Family Gets a $3 IP66 Waterproof Enclosure.

Pictures via CNX Software; originally found via [WayBack] $2.90 waterproof case for +ITEAD Studio Sonoff switches… – Jean-Luc Aufranc – Google+

–jeroen

Read the rest of this entry »

Posted in Development, ESP8266, Hardware Development, IoT Internet of Things, Network-and-equipment, Power User | Leave a Comment »

`ll header` in `martian source` is the Data Link Layer: 2 MAC addresses

Posted by jpluimers on 2019/06/03

The ll header field in a martian source message on linux is about the [WayBackEthernet frame – Wikipedia: Data Link Layer.

The first 6 hex digits are the source MAC address, the next are the destination MAC address:

May 10 08:59:24 linux kernel: IPv4: martian source 255.255.255.255 from 192.168.17.44, on dev eth1
May 10 08:59:24 linux kernel: ll header: 00000000: ff ff ff ff ff ff 00 0c 29 f7 0f fe 08 00 ........).....

In the above example:

  • Destination = MAC ff ff ff ff ff ff (broadcast, which corresponds with IPv4 target 255.255.255.255)
  • Source = MAC 00 0c 29 f7 0f fe (specific, which I could verify after checking out the machine having IPv4 192.168.17.44)
  • EtherType  08 00 (IPv4)

Some sources indicate it is a martian, as 255.255.255.255 is never a valid IP address, but [WayBack] Martian packet – Wikipedia: IPv4 disagrees.

References:

–jeroen

Posted in Ethernet, Network-and-equipment, Power User | Leave a Comment »

Repurposing Old Smartphones for Home Automation | Linux.com | The source for Linux information

Posted by jpluimers on 2019/03/13

Interesting read and watch:

At the recent Embedded Linux Conference and OpenIoT Summit, Mozilla Technical Evangelist Dietrich Ayala proposed a simple and affordable solution to home automation: A discarded smartphone can handle some of the most useful home automation tasks without requiring expensive hubs and sensors — or risking data security in the cloud.

Source: [WayBackRepurposing Old Smartphones for Home Automation | Linux.com | The source for Linux information.

Via Ruurd Pels.

GitHub Repository  autonome/context by autonome (Dietrich Ayala)

–jeroen

Posted in Development, Hardware Development, IoT Internet of Things, Network-and-equipment, Power User, Software Development | Leave a Comment »

 
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