==== 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      182548304     1458.928  100.00% 
Conn:   1 Mbps:     1458.928 Peak Mbps:     1458.928 Avg Mbps:     1458.928
        2001      157810096     1262.481  100.00% 
Conn:   1 Mbps:     1262.481 Peak Mbps:     1458.928 Avg Mbps:     1262.481
        3008      198739264     1580.432  100.00% 
Conn:   1 Mbps:     1580.432 Peak Mbps:     1580.432 Avg Mbps:     1580.432
        4009      176404608     1409.827  100.00% 
Conn:   1 Mbps:     1409.827 Peak Mbps:     1580.432 Avg Mbps:     1409.827
        5012      203450400     1624.354  100.00% 
Conn:   1 Mbps:     1624.354 Peak Mbps:     1624.354 Avg Mbps:     1624.354
--- fc00:0:0:1::41 tcpbench statistics ---
1107145944 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1262.481/1467.204/1624.354/128.677 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
      36     32768         0 
DISABLED