==== 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      194529400     1553.129  100.00% 
Conn:   1 Mbps:     1553.129 Peak Mbps:     1553.129 Avg Mbps:     1553.129
        2002      251848120     2014.785  100.00% 
Conn:   1 Mbps:     2014.785 Peak Mbps:     2014.785 Avg Mbps:     2014.785
        3006      226161200     1802.081  100.00% 
Conn:   1 Mbps:     1802.081 Peak Mbps:     2014.785 Avg Mbps:     1802.081
        4007      165641784     1325.134  100.00% 
Conn:   1 Mbps:     1325.134 Peak Mbps:     2014.785 Avg Mbps:     1325.134
        5015      189622824     1506.438  100.00% 
Conn:   1 Mbps:     1506.438 Peak Mbps:     2014.785 Avg Mbps:     1506.438
--- fc00:0:0:1::20 tcpbench statistics ---
1213584608 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1325.134/1640.313/2014.785/241.354 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
      66     32768         0 
DISABLED