Hamming codes

IPv6:
	Adoption
	An important note:  A network card can have multiple IPv6 addresses
		Hey, there's plenty of them, right?
		Practical note on configuring them...
		"Interface ID" is the last 64 bits
		It can distinguish computers
		You can set more than one for the same computer if you want	
	Note about ssh to link-local IPv6:
		Must use % to specify which interface to come from
	Note on address length:  Can abbreviate 0's
		1.  Omit leading 0's
		2.  Merge together adjacent blocks that are 0 with ::
			Note on 2:  Can only do it once
	We can make up our address, with caveats:
		2000::/3 is global unicast
			Doesn't really matter, but we'll avoid it anyway
		FE80::/10 is link local
			What is that?
			Weird caveat:  SSH won't figure out which interface to use
				FE80 isn't routable
				Seems like if there's one interface, it'd be easy to figure out
		FC00::/7 and FD00::/8 are local unicast (like 192.168)
			Do you need them?  Only with NAT, but we don't need NAT
			Some philisophical arguments against them
		FF00::/8 is multicast
			More specific than broadcast, could confuse switches
	Now that maybe it makes more sense:  NAT?
		https://www.rfc-editor.org/rfc/rfc4864
		Summary:  Don't use NAT

Demo:
	I had trouble with it last time, but then it worked
		Not sure I ever figured out why!
	It'll work in this room
	Can we connect as far as isoptera?
	Farther than isoptera?
		Not last time I checked!