==== 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      267473168     2137.648  100.00% 
Conn:   1 Mbps:     2137.648 Peak Mbps:     2137.648 Avg Mbps:     2137.648
        2003      288096256     2302.468  100.00% 
Conn:   1 Mbps:     2302.468 Peak Mbps:     2302.468 Avg Mbps:     2302.468
        3003      292290560     2338.324  100.00% 
Conn:   1 Mbps:     2338.324 Peak Mbps:     2338.324 Avg Mbps:     2338.324
        4004      292290560     2335.988  100.00% 
Conn:   1 Mbps:     2335.988 Peak Mbps:     2338.324 Avg Mbps:     2335.988
        5005      254711528     2037.692  100.00% 
Conn:   1 Mbps:     2037.692 Peak Mbps:     2338.324 Avg Mbps:     2037.692
--- fc00:0:0:1::20 tcpbench statistics ---
1681400800 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 2037.692/2230.424/2338.324/121.433 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
      14     32768         0 
DISABLED