==== 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      164920904     1316.734  100.00% 
Conn:   1 Mbps:     1316.734 Peak Mbps:     1316.734 Avg Mbps:     1316.734
        2002      191926288     1536.947  100.00% 
Conn:   1 Mbps:     1536.947 Peak Mbps:     1536.947 Avg Mbps:     1536.947
        3002      198202616     1585.621  100.00% 
Conn:   1 Mbps:     1585.621 Peak Mbps:     1585.621 Avg Mbps:     1585.621
        4003      207466792     1659.734  100.00% 
Conn:   1 Mbps:     1659.734 Peak Mbps:     1659.734 Avg Mbps:     1659.734
        5003      284426240     2275.410  100.00% 
Conn:   1 Mbps:     2275.410 Peak Mbps:     2275.410 Avg Mbps:     2275.410
--- fc00:0:0:1::20 tcpbench statistics ---
1327436920 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1316.734/1674.889/2275.410/321.287 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
      45     32768         0 
DISABLED