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

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Archive for the ‘Power User’ Category

nanog: Forwarding issues related to MACs starting with a 4 or a 6 (Was: [c-nsp] Wierd MPLS/VPLS issue)

Posted by jpluimers on 2016/12/05

Time after time issues pop up related to MAC addresses that start with a4 or a 6.

[WayBacknanog: Forwarding issues related to MACs starting with a 4 or a 6 (Was: [c-nsp] Wierd MPLS/VPLS issue)

The underlying issue has to do with switches interpreting too much information of (un)encrypted traffic and dropping them because they wrongly think it’s plain ethernet traffic they need to handle.

MAC addresses starting with a 4 or 6 have have a common bit pattern (likekly that fails with 12 and 14 as well) that cause failure in certain network equipment that’s hard to trace as there is limited.

[WayBackChristian Vogel – Google+ (Physics, Electronics, Software) explains this way better at [WayBack] When your MAC address starts with 4 or 6, weird things can happen and it’s not always fixable… – Kristian Köhntopp – Google+:

Read the rest of this entry »

Posted in Internet, Network-and-equipment, Power User, Routers, VPN | Leave a Comment »

18 Useful Commands to Get Hardware Information on Linux – Linuxslaves

Posted by jpluimers on 2016/12/05

Quick look at commands that can be used to gather hardware information such as cpu, disks, memory, partition, peripherals etc on Linux OS based systems

Source: 18 Useful Commands to Get Hardware Information on Linux – Linuxslaves

Covered commands (the article has no index and the headings in it don’t have an id tag, so I linked them to other relevant URLs if I could find them):

  1. lshw
  2. lscpu
  3. lspci
  4. lsusb
  5. lsbk
  6. fdisk
  7. dmidecode
  8. /proc files
  9. free
  10. lsscsi

via:

–jeroen

Posted in Power User, *nix, Linux, SuSE Linux, *nix-tools, openSuSE, RedHat, Tumbleweed, Ubunto | 2 Comments »

Apache error 503 when using ProxyPass:

Posted by jpluimers on 2016/12/05

When using ProxyPass (for instance within a Location) in Apache and you get an http error 503 (service unavailable), then usually the page/service to which the proxy directs to is dead.

I had this when shellinabox (forked from the old Google code repo) died on me.

In addition, ensure your ProxyPass statements contain a slash at the end your you will get a http error 502  (bad gateway):

–jeroen

via:

Posted in *nix, *nix-tools, Apache2, Power User | Leave a Comment »

Make a cheap TOR anonymizer — BYTESEC Labs Inc

Posted by jpluimers on 2016/12/02

I had a few friends ask if they could buy a cheap travel router that protects their internet activity as they travel around the globe. So my criteria:

  1. Cheap (< USD 20)
  2. Portable (pocket size)

Source: [WayBackMake a cheap TOR anonymizer — BYTESEC Labs Inc

via: [WayBack] hmmm – Joe C. Hecht – Google+

–jeroen

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

C13/C14 wiring diagram live/neutral/earth

Posted by jpluimers on 2016/12/02

Thanks Simon Carter for this info:

C14 (male; left) and C13 (female; right)

C14 (male; left) and C13 (female; right)

Viewing a socket (line or chassis) from the front, i.e. the side that the plug fits into, the connections are:

  • Left Pin: Neutral
  • Centre Pin: Earth
  • Right Pin: Live

Source: Electronics 2000 | Pin-outs | IEC Connectors

If you wire it, the colours depend on where you live. I live in the Netherlands so this shortened table does apply:

IEC (most of Europe) AC power circuit wiring color codes.

Function label Color, IEC Color, old IEC
Protective earth PE green-yellow green-yellow
Neutral N blue blue
Line, single phase L brown brown or black

Longer tables and infographics are here:

–jeroen

Posted in Development, Electronics Development, LifeHacker, Power User | Leave a Comment »

 
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