==== 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      162681896     1298.857  100.00% 
Conn:   1 Mbps:     1298.857 Peak Mbps:     1298.857 Avg Mbps:     1298.857
        2003      165825224     1326.602  100.00% 
Conn:   1 Mbps:     1326.602 Peak Mbps:     1326.602 Avg Mbps:     1326.602
        3002      157091144     1257.987  100.00% 
Conn:   1 Mbps:     1257.987 Peak Mbps:     1326.602 Avg Mbps:     1257.987
        4002      162098216     1296.786  100.00% 
Conn:   1 Mbps:     1296.786 Peak Mbps:     1326.602 Avg Mbps:     1296.786
        5004      161742480     1292.647  100.00% 
Conn:   1 Mbps:     1292.647 Peak Mbps:     1326.602 Avg Mbps:     1292.647
--- fc00:0:0:1::20 tcpbench statistics ---
965048920 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1257.987/1294.576/1326.602/21.869 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
      33     32768         0 
DISABLED