==== run-tcpbench6-3-1 ====
rm -f nc.log
nc -6 -v -l -V 20 fc00:0:0:1::20 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::20 12345
# Test that path MTU dicovery is working.
tcpbench -6 -t 5 -V 22 -b fc00::22 fc00:0:0:1::20
  elapsed_ms          bytes         mbps   bwidth 
        1002      181757072     1451.154  100.00% 
Conn:   1 Mbps:     1451.154 Peak Mbps:     1451.154 Avg Mbps:     1451.154
        2003      170916032     1365.962  100.00% 
Conn:   1 Mbps:     1365.962 Peak Mbps:     1451.154 Avg Mbps:     1365.962
        3002      198996536     1593.566  100.00% 
Conn:   1 Mbps:     1593.566 Peak Mbps:     1593.566 Avg Mbps:     1593.566
        4002      204008464     1633.701  100.00% 
Conn:   1 Mbps:     1633.701 Peak Mbps:     1633.701 Avg Mbps:     1633.701
        5003      239731840     1917.855  100.00% 
Conn:   1 Mbps:     1917.855 Peak Mbps:     1917.855 Avg Mbps:     1917.855
--- fc00:0:0:1::20 tcpbench statistics ---
1259388952 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1365.962/1592.448/1917.855/189.131 Mbps
# path MTU discovery in other rtable does not work in ip6_output()
/sbin/route -T 22 -n get -host -inet6 fc00:0:0:1::20
   route to: fc00:0:0:1::20
destination: fc00::
       mask: ffff:ffff:ffff::
    gateway: ::1
  interface: lo22
 if address: ::1
   priority: 8 (static)
      flags: <UP,GATEWAY,DONE,STATIC>
     use       mtu    expire
      36     32768         0 
DISABLED