==== 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      172184512     1376.100  100.00% 
Conn:   1 Mbps:     1376.100 Peak Mbps:     1376.100 Avg Mbps:     1376.100
        2002      187323360     1498.587  100.00% 
Conn:   1 Mbps:     1498.587 Peak Mbps:     1498.587 Avg Mbps:     1498.587
        3002      237594312     1900.754  100.00% 
Conn:   1 Mbps:     1900.754 Peak Mbps:     1900.754 Avg Mbps:     1900.754
        4003      217212360     1735.963  100.00% 
Conn:   1 Mbps:     1735.963 Peak Mbps:     1900.754 Avg Mbps:     1735.963
        5010      186590632     1482.349  100.00% 
Conn:   1 Mbps:     1482.349 Peak Mbps:     1900.754 Avg Mbps:     1482.349
--- fc00:0:0:1::41 tcpbench statistics ---
1190128832 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1376.100/1598.751/1900.754/191.410 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
      62     32768         0 
DISABLED