	---------------- n6 -------------------- j ------------------------ n4
	                    0021::        0001::   .1                    .2
	2001:db8:3::/120    2001:db8:1c0:0002/64         198.51.100/24
	     (EAMT)                (pool6)                  (pool6)
	(IPv4: 1.0.0/24)     (IPv4: 192.0.2/24)    (IPv6: 2001:db8:01__/40)

n6 and n4 are actually the same machine (ie. the current namespace). j is
enclosed in the joolns namespace.

n6
	2001:0db8:01c0:0002:0021::/64
	default via j

j
	2001:db8:1c0:2:1::/64
	198.51.100.1/24
	2001:db8:3::/120 via n6
	pool6
		2001:db8:100::/40
	EAMT
		2001:db8:3::/120 1.0.0.0/24
			Network 2001:db8:3::/120 does not actually
			exist.
			It's intended to trigger ICMP errors by n6.
		2001:db8:2::/120 10.0.0.0/24
			(I don't remember what this one is for.)
	pool6791
		203.0.113.8

n4
	198.51.100.2/24
	192.0.2.0/24 via j

Easy ping from n6 to n4:
	ping6 2001:db8:1c6:3364:2::
Easy ping from n4 to n6:
	ping 192.0.2.33

