==== 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      195477752     1563.822  100.00% 
Conn:   1 Mbps:     1563.822 Peak Mbps:     1563.822 Avg Mbps:     1563.822
        2001      217849016     1742.792  100.00% 
Conn:   1 Mbps:     1742.792 Peak Mbps:     1742.792 Avg Mbps:     1742.792
        3001      245825032     1966.600  100.00% 
Conn:   1 Mbps:     1966.600 Peak Mbps:     1966.600 Avg Mbps:     1966.600
        4001      281366024     2250.928  100.00% 
Conn:   1 Mbps:     2250.928 Peak Mbps:     2250.928 Avg Mbps:     2250.928
        5002      193487728     1546.355  100.00% 
Conn:   1 Mbps:     1546.355 Peak Mbps:     2250.928 Avg Mbps:     1546.355
--- fc00:0:0:1::41 tcpbench statistics ---
1331140888 bytes sent over 6.006 seconds
bandwidth min/avg/max/std-dev = 1546.355/1814.100/2250.928/265.890 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
      42     32768         0 
DISABLED