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

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Archive for June 3rd, 2019

Marantec | Deleting the code of hand transmitters (Multi-Bit) – YouTube

Posted by jpluimers on 2019/06/03

  1. Put the the 3-wire program connector into the remote
  2. Hold a metal object to the 3 pins of the program connector to short them
  3. Push a button: Now that button has been cleared.
  4. Remote the metal object from the 3 pins of the program connector
  5. Push the same button: If it has been cleared, your gate/garage won’t move

–jeroen

Read the rest of this entry »

Posted in LifeHacker, 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 [WayBack] Ethernet 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 »

keyboard – How to add a line break in a cell in Excel for Mac – Ask Different

Posted by jpluimers on 2019/06/03

What key combination do I have to press to create a line break in a cell in Excel for Mac 2011? The Windows combination of Alt+Enter does not work on the Mac.

Source: [WayBack] keyboard – How to add a line break in a cell in Excel for Mac – Ask Different

The answer depends on the Excel for Mac OS X version you are using.

Excel 2015 is simple (thanks esham): use Option+Enter.

In older Excel <= 2011 (thanks nwinkler), use Command+Option+Enter or Control+Option+Enter.

Some users report the also need the Fn key in addition to the above modifiers.

–jeroen

PS: Later I found out that [WayBack] Beckism.com: Use a linebreak in Excel on Mac also shows the Excel <= 2011 solution Control+Option+Return (note that Return is the same key as Enter).

Posted in Apple, Excel, Mac, Mac OS X / OS X / MacOS, MacBook, MacBook Retina, MacBook-Air, MacBook-Pro, macOS 10.12 Sierra, Office, Office 2011 for Mac, Power User | Leave a Comment »

 
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