==== 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 
        1001      209510400     1674.409  100.00% 
Conn:   1 Mbps:     1674.409 Peak Mbps:     1674.409 Avg Mbps:     1674.409
        2001      215015656     1720.125  100.00% 
Conn:   1 Mbps:     1720.125 Peak Mbps:     1720.125 Avg Mbps:     1720.125
        3005      242782184     1936.448  100.00% 
Conn:   1 Mbps:     1936.448 Peak Mbps:     1936.448 Avg Mbps:     1936.448
        4004      246545800     1974.341  100.00% 
Conn:   1 Mbps:     1974.341 Peak Mbps:     1974.341 Avg Mbps:     1974.341
        5007      186594504     1489.776  100.00% 
Conn:   1 Mbps:     1489.776 Peak Mbps:     1974.341 Avg Mbps:     1489.776
--- fc00:0:0:1::41 tcpbench statistics ---
1280079408 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1489.776/1759.020/1974.341/178.330 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
      50     32768         0 
DISABLED