==== 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 
        1002      178334256     1423.826  100.00% 
Conn:   1 Mbps:     1423.826 Peak Mbps:     1423.826 Avg Mbps:     1423.826
        2002      194284744     1554.278  100.00% 
Conn:   1 Mbps:     1554.278 Peak Mbps:     1554.278 Avg Mbps:     1554.278
        3003      189005736     1512.046  100.00% 
Conn:   1 Mbps:     1512.046 Peak Mbps:     1554.278 Avg Mbps:     1512.046
        4005      206107440     1647.212  100.00% 
Conn:   1 Mbps:     1647.212 Peak Mbps:     1647.212 Avg Mbps:     1647.212
        5005      209992736     1681.624  100.00% 
Conn:   1 Mbps:     1681.624 Peak Mbps:     1681.624 Avg Mbps:     1681.624
--- fc00:0:0:1::41 tcpbench statistics ---
1172155344 bytes sent over 6.002 seconds
bandwidth min/avg/max/std-dev = 1423.826/1563.797/1681.624/92.953 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
      39     32768         0 
DISABLED