==== run-tcpbench6-3-1 ====
rm -f nc.log
nc -6 -v -l -V 20 fc00:0:0:1::20 12345 >/dev/null 2>nc.log &
# Wait until nc is listening.
for  i in `jot 30`; do if fgrep -q Listening nc.log; then break; fi; sleep .1; done
fgrep Listening nc.log
Listening on fc00:0:0:1::20 12345
# Test that path MTU dicovery is working.
tcpbench -6 -t 5 -V 22 -b fc00::22 fc00:0:0:1::20
  elapsed_ms          bytes         mbps   bwidth 
        1001      177643704     1419.730  100.00% 
Conn:   1 Mbps:     1419.730 Peak Mbps:     1419.730 Avg Mbps:     1419.730
        2001      194792744     1558.342  100.00% 
Conn:   1 Mbps:     1558.342 Peak Mbps:     1558.342 Avg Mbps:     1558.342
        3008      208956992     1661.686  100.00% 
Conn:   1 Mbps:     1661.686 Peak Mbps:     1661.686 Avg Mbps:     1661.686
        4009      284059992     2272.480  100.00% 
Conn:   1 Mbps:     2272.480 Peak Mbps:     2272.480 Avg Mbps:     2272.480
        5008      270350576     2164.970  100.00% 
Conn:   1 Mbps:     2164.970 Peak Mbps:     2272.480 Avg Mbps:     2164.970
--- fc00:0:0:1::20 tcpbench statistics ---
1427045992 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1419.730/1815.441/2272.480/339.818 Mbps
# path MTU discovery in other rtable does not work in ip6_output()
/sbin/route -T 22 -n get -host -inet6 fc00:0:0:1::20
   route to: fc00:0:0:1::20
destination: fc00::
       mask: ffff:ffff:ffff::
    gateway: ::1
  interface: lo22
 if address: ::1
   priority: 8 (static)
      flags: <UP,GATEWAY,DONE,STATIC>
     use       mtu    expire
      32     32768         0 
DISABLED