"gateway of last resort" term:
	ChatGPT says it's the default gateway
	Seems like it's in good company there
	I've always associated the term with routers

Alright, routing!
	We've added a bunch of default routes
	Now more routes!

Demo setup today:
	My old piece of junk laptop (orcrist) running FreeBSD
	Another old piece of junk laptop running Linux with no wifi card
		IF it works!
		I can borrow a desktop in 310 if it doesn't
	Can we get the Linux laptop online using the wifi in this room?

Piece of the puzzle #1:  How are you going to see what I'm doing?
	First:  The projector!
	Second:  We can SSH into it so the screen share looks good

Piece #2:  Connecting them together with a little subnet
	We'll give each of them an address in 172.16
	Can they communicate?  (hopefully!)
	
Piece #3:  Putting ocrist online
	We'll do this as manually as possible!
		Automation hides the details
	wpa_supplicant to handle the WPA authentication
	Then we'll use dhclient to run DHCP
	Let's see what we ended up with for a routing table (netstat -r)

Two ways we could go from here:
	Bridging:  Just send traffic back and forth without change IP range
	NAT:  Have a different IP range on each side of orcrist

Piece #4:  Using NAT
	We could set gateway_enable="YES" in rc.conf to turn this on all the time
		I don't want to
		Makes it easy to cause a weird problem
	sysctl net.inet.ip.forwarding needs to be set to 1
		There's a /proc file in Linux that'll do the equivalent thing
	Setting a route to the little network isn't really needed in this case
		Because we're directly connected to 172.16
	So we can talk to either the Internet or our other laptop!
	/etc/pf.conf and pfctl
	Run like this:  pfctl -nvf /etc/pf.conf
		Take out "n" to have it actually add the route
		Good to verify first!
	A suggestion from the FreeBSD Handbook:
		ext_if = "xl0"	# macro for external interface - use tun0 for PPPoE
		int_if = "xl1"	# macro for internal interface
		localnet = $int_if:network
		# ext_if IP address could be dynamic, hence ($ext_if)
		nat on $ext_if from $localnet to any -> ($ext_if)
		block all
		pass from { lo0, $localnet } to any keep state
	Does it work?  (who knows!)

Piece #5:  Not using NAT
	Bridging:  Basically, we'll just pass traffic through in a transparent manner
		Our presence will be invisible!
	ifconfig bridge create
	ifconfig bridge0
	ifconfig bridge0 addm wlan0 addm em0 up
	(and have both interfaces actually up)
	Bridge can have an IP address if we want it to
		Do we?  Probably
		Will this work?  I couldn't get it to work with wifi, but I'll try wired

Couple other things we could do:
	Since the switch ports aren't set to trunk (probably), we can't play with vlans
		Could otherwise - Linux and FreeBSD are happy to play ball
	STP/RSTP:  Linux and FreeBSD are again happy to play ball
		I doubt the switch wants to, certainly not the AP

Alright, we've put orcrist into the middle in a couple configurations
	Let's run wireshark on ocrcist and spy on the other laptop!

Could you use this in other ways?
	Sure!  We could, for example, set up our own wifi network
		Just need another card