==== 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      158060608     1264.485  100.00% 
Conn:   1 Mbps:     1264.485 Peak Mbps:     1264.485 Avg Mbps:     1264.485
        2001      173143264     1383.762  100.00% 
Conn:   1 Mbps:     1383.762 Peak Mbps:     1383.762 Avg Mbps:     1383.762
        3002      176639088     1411.701  100.00% 
Conn:   1 Mbps:     1411.701 Peak Mbps:     1411.701 Avg Mbps:     1411.701
        4003      186199136     1489.593  100.00% 
Conn:   1 Mbps:     1489.593 Peak Mbps:     1489.593 Avg Mbps:     1489.593
        5001      273446176     2191.953  100.00% 
Conn:   1 Mbps:     2191.953 Peak Mbps:     2191.953 Avg Mbps:     2191.953
--- fc00:0:0:1::41 tcpbench statistics ---
1141926608 bytes sent over 6.002 seconds
bandwidth min/avg/max/std-dev = 1264.485/1548.299/2191.953/329.854 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