IPv6 Link Local Addresses – 64 or 48-bit MAC Addresses?

In last week’s Chit Chat Across the Pond, I asked Bart to come during his off season to explain IPv6 to us. After the show aired, Kevin Jones DM’d me on Twitter and DJ made a comment on the blog, both with the same correction. One of the rules of this episode was that Bart only had a few days to learn the background himself so it was expected there might be errors. As always though, Bart is weird in that he actually likes to be corrected. Seriously,

Anyway, they were both commenting on this statement:

In IPv6, the host part is always 64bits long. This is conveniently the length of a MAC address.

They both explained that MAC addresses as we are used to seeing them, are 48 bits, not 64 bits.

Now this is going to sound a bit like explaining the tax code but I hope you’ll bear with me because there are a couple of parts here I think are interesting. First of all, Bart wasn’t technically wrong, but DJ and Kevin are more specifically correct.

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CCATP #462 Brian Johnson on Inspiring Kids with Bottle Rockets and Science

Brian johnson and a bottle rocketThis week, Steve and I share hosting Chit Chat Across the Pond with retired electrical engineer, ham radio nerd, and remote control flier, Brian Johnson. Brian explains how he has taken his love of electronics and works to spread his enthusiasm to kids through volunteering at local schools.

The pinnacle of his experiences was when he got to help the kids at St. Bernard High School talk live using ham¬†radio to astronauts aboard the Endeavor Space Shuttle. Lately he’s been teaching kids to build tiny ham radios and shoot compressed air and water bottle rockets and even learn the math behind why they work.

If you want to contact Brian, you can email him at:  ab6ui@aol.com
And you can find the Hughes Amateur Radio Club at https://mksummits.com/w6ha/

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CCATP #425 Pretend I’m Dumb About Math with Cheyenne Swenson

common core math exampleIn this week’s episode of Chit Chat Across the Pond I asked Cheyenne Swenson, 2nd grade teacher at Gallatin Elementary School in Southern California, to come on the show and explain Common Core Math to me. This is a challenging episode because my arithmetic skills were stunted by New Math in the 1960s. Cheyenne explains how she thought this was some crazy new fad when it started but that now she’s a believer because she’s seen kids really “getting” math in a way they never did before and she even enjoys teaching it.

  • Apps she described: Tellagami and Green Screen by Do Ink
  • Video using Tellagami and Green Screen: Common Core Math Described by Second Graders
  • Books on Common Core Math: Children’s Mathematics by Carpenter, Fennema et al and Intentional Talk By Kazemi and Hintz
  • Learn About Ed Camps in Your Area at edcamp.org

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