**Michael W Lucas** @mwlucas · 2018-06-17T21:30:46Z

Michael W Lucas @mwlucas

"if someone tries to explain Class A, Class B, or Class C addresses to you, plug your ears and scream at them not to contaminate your brain with information made obsolete more than two decades ago." #af3e #footnote

Jun 17, 2018, 21:30 · Web · 9 · 13

**kat** @boneidol@indy.im · Jun 17, 2018, 22:06

**kat** @boneidol@indy.im · Jun 17, 2018, 22:06

@mwlucas I had an Foundry FastIron II switch once that would not let you aggregate networks that had prefix 192.168.. i.e you could not create a route 192.168.10.0/23 ... Tech support told me that it was because they were Class C addresses.

**Michael W Lucas** @mwlucas · Jun 17, 2018, 22:33

**Michael W Lucas** @mwlucas · Jun 17, 2018, 22:33

@boneidol Dare I ask what year this was?

No, never mind. The answer won't make me a happier person.

**kat** @boneidol@indy.im · Jun 18, 2018, 01:27

**kat** @boneidol@indy.im · Jun 18, 2018, 01:27

@mwlucas 2004? RFC 1519 CIDR was published in 1993

**Michael W Lucas** @mwlucas · Jun 18, 2018, 02:03

**Michael W Lucas** @mwlucas · Jun 18, 2018, 02:03

@boneidol Yep.

Not a happier person.

**Jeroen** @qqlq · Jun 18, 2018, 11:37

**Jeroen** @qqlq · Jun 18, 2018, 11:37

@mwlucas I'm sure I mentioned this before but I remember having discussions with a fellow educator two years ago when I saw him asking exam questions about classful networking.

This was the first year I had complete control over the networking class at our university, and it's the first year in which classes are no longer treated.

**Michael W Lucas** @mwlucas · Jun 18, 2018, 12:18

**Michael W Lucas** @mwlucas · Jun 18, 2018, 12:18

@qqlq Good for you!