==== run-tcpbench6-3-1 ====
rm -f nc.log
nc -6 -v -l -V 41 fc00:0:0:1::41 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::41 12345
# Test that path MTU dicovery is working.
tcpbench -6 -t 5 -V 43 -b fc00::43 fc00:0:0:1::41
  elapsed_ms          bytes         mbps   bwidth 
        1000      196332240     1570.658  100.00% 
Conn:   1 Mbps:     1570.658 Peak Mbps:     1570.658 Avg Mbps:     1570.658
        2001      187014384     1496.115  100.00% 
Conn:   1 Mbps:     1496.115 Peak Mbps:     1570.658 Avg Mbps:     1496.115
        3002      257362552     2056.844  100.00% 
Conn:   1 Mbps:     2056.844 Peak Mbps:     2056.844 Avg Mbps:     2056.844
        4003      266561480     2130.361  100.00% 
Conn:   1 Mbps:     2130.361 Peak Mbps:     2130.361 Avg Mbps:     2130.361
        5010      271402184     2156.125  100.00% 
Conn:   1 Mbps:     2156.125 Peak Mbps:     2156.125 Avg Mbps:     2156.125
--- fc00:0:0:1::41 tcpbench statistics ---
1387610256 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1496.115/1882.021/2156.125/287.485 Mbps
# path MTU discovery in other rtable does not work in ip6_output()
/sbin/route -T 43 -n get -host -inet6 fc00:0:0:1::41
   route to: fc00:0:0:1::41
destination: fc00::
       mask: ffff:ffff:ffff::
    gateway: ::1
  interface: lo43
 if address: ::1
   priority: 8 (static)
      flags: <UP,GATEWAY,DONE,STATIC>
     use       mtu    expire
      70     32768         0 
DISABLED