==== 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 
        1001      198638856     1587.523  100.00% 
Conn:   1 Mbps:     1587.523 Peak Mbps:     1587.523 Avg Mbps:     1587.523
        2001      202961864     1623.695  100.00% 
Conn:   1 Mbps:     1623.695 Peak Mbps:     1623.695 Avg Mbps:     1623.695
        3001      254427192     2035.418  100.00% 
Conn:   1 Mbps:     2035.418 Peak Mbps:     2035.418 Avg Mbps:     2035.418
        4001      263740128     2112.033  100.00% 
Conn:   1 Mbps:     2112.033 Peak Mbps:     2112.033 Avg Mbps:     2112.033
        5001      285660864     2285.287  100.00% 
Conn:   1 Mbps:     2285.287 Peak Mbps:     2285.287 Avg Mbps:     2285.287
--- fc00:0:0:1::20 tcpbench statistics ---
1492214440 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1587.523/1928.791/2285.287/276.255 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
      50     32768         0 
DISABLED