==== 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      177154944     1414.411  100.00% 
Conn:   1 Mbps:     1414.411 Peak Mbps:     1414.411 Avg Mbps:     1414.411
        2003      193596680     1548.773  100.00% 
Conn:   1 Mbps:     1548.773 Peak Mbps:     1548.773 Avg Mbps:     1548.773
        3004      183276624     1466.213  100.00% 
Conn:   1 Mbps:     1466.213 Peak Mbps:     1548.773 Avg Mbps:     1466.213
        4004      167991616     1343.933  100.00% 
Conn:   1 Mbps:     1343.933 Peak Mbps:     1548.773 Avg Mbps:     1343.933
        5004      207281848     1658.255  100.00% 
Conn:   1 Mbps:     1658.255 Peak Mbps:     1658.255 Avg Mbps:     1658.255
--- fc00:0:0:1::20 tcpbench statistics ---
1128617368 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1343.933/1486.317/1658.255/108.914 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
      59     32768         0 
DISABLED