==== 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 
        1004      145265120     1157.491  100.00% 
Conn:   1 Mbps:     1157.491 Peak Mbps:     1157.491 Avg Mbps:     1157.491
        2010      195226848     1552.500  100.00% 
Conn:   1 Mbps:     1552.500 Peak Mbps:     1552.500 Avg Mbps:     1552.500
        3010      204566336     1638.169  100.00% 
Conn:   1 Mbps:     1638.169 Peak Mbps:     1638.169 Avg Mbps:     1638.169
        4011      265935504     2125.359  100.00% 
Conn:   1 Mbps:     2125.359 Peak Mbps:     2125.359 Avg Mbps:     2125.359
        5025      177946064     1403.914  100.00% 
Conn:   1 Mbps:     1403.914 Peak Mbps:     2125.359 Avg Mbps:     1403.914
--- fc00:0:0:1::41 tcpbench statistics ---
1163567592 bytes sent over 6.002 seconds
bandwidth min/avg/max/std-dev = 1157.491/1575.486/2125.359/319.679 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
      47     32768         0 
DISABLED