==== 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      173435328     1387.483  100.00% 
Conn:   1 Mbps:     1387.483 Peak Mbps:     1387.483 Avg Mbps:     1387.483
        2002      194004432     1548.938  100.00% 
Conn:   1 Mbps:     1548.938 Peak Mbps:     1548.938 Avg Mbps:     1548.938
        3002      205397608     1644.826  100.00% 
Conn:   1 Mbps:     1644.826 Peak Mbps:     1644.826 Avg Mbps:     1644.826
        4003      208347664     1666.781  100.00% 
Conn:   1 Mbps:     1666.781 Peak Mbps:     1666.781 Avg Mbps:     1666.781
        5004      307341608     2458.733  100.00% 
Conn:   1 Mbps:     2458.733 Peak Mbps:     2458.733 Avg Mbps:     2458.733
--- fc00:0:0:1::41 tcpbench statistics ---
1278134568 bytes sent over 6.004 seconds
bandwidth min/avg/max/std-dev = 1387.483/1741.352/2458.733/371.957 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
      58     32768         0 
DISABLED