==== 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      158039032     1263.049  100.00% 
Conn:   1 Mbps:     1263.049 Peak Mbps:     1263.049 Avg Mbps:     1263.049
        2000      187884560     1504.581  100.00% 
Conn:   1 Mbps:     1504.581 Peak Mbps:     1504.581 Avg Mbps:     1504.581
        3001      223803648     1790.429  100.00% 
Conn:   1 Mbps:     1790.429 Peak Mbps:     1790.429 Avg Mbps:     1790.429
        4002      225617592     1803.138  100.00% 
Conn:   1 Mbps:     1803.138 Peak Mbps:     1803.138 Avg Mbps:     1803.138
        5002      159232976     1273.864  100.00% 
Conn:   1 Mbps:     1273.864 Peak Mbps:     1803.138 Avg Mbps:     1273.864
--- fc00:0:0:1::41 tcpbench statistics ---
1132981960 bytes sent over 6.002 seconds
bandwidth min/avg/max/std-dev = 1263.049/1527.012/1803.138/236.600 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