==== 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      227871864     1822.975  100.00% 
Conn:   1 Mbps:     1822.975 Peak Mbps:     1822.975 Avg Mbps:     1822.975
        2002      187833856     1501.170  100.00% 
Conn:   1 Mbps:     1501.170 Peak Mbps:     1822.975 Avg Mbps:     1501.170
        3002      197706496     1581.652  100.00% 
Conn:   1 Mbps:     1581.652 Peak Mbps:     1822.975 Avg Mbps:     1581.652
        4003      211728944     1692.139  100.00% 
Conn:   1 Mbps:     1692.139 Peak Mbps:     1822.975 Avg Mbps:     1692.139
        5006      205950488     1642.676  100.00% 
Conn:   1 Mbps:     1642.676 Peak Mbps:     1822.975 Avg Mbps:     1642.676
--- fc00:0:0:1::41 tcpbench statistics ---
1324659720 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1501.170/1648.122/1822.975/108.216 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
      59     32768         0 
DISABLED