==== run-tcpbench6-3-1 ====
rm -f nc.log
nc -6 -v -l -V 41 fc00:0:0:1::41 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::41 12345
# Test that path MTU dicovery is working.
tcpbench -6 -t 5 -V 43 -b fc00::43 fc00:0:0:1::41
  elapsed_ms          bytes         mbps   bwidth 
        1003      177421912     1415.130  100.00% 
Conn:   1 Mbps:     1415.130 Peak Mbps:     1415.130 Avg Mbps:     1415.130
        2004      200057240     1598.859  100.00% 
Conn:   1 Mbps:     1598.859 Peak Mbps:     1598.859 Avg Mbps:     1598.859
        3006      193933624     1548.372  100.00% 
Conn:   1 Mbps:     1548.372 Peak Mbps:     1598.859 Avg Mbps:     1548.372
        4006      218024864     1745.945  100.00% 
Conn:   1 Mbps:     1745.945 Peak Mbps:     1745.945 Avg Mbps:     1745.945
        5006      178355888     1426.847  100.00% 
Conn:   1 Mbps:     1426.847 Peak Mbps:     1745.945 Avg Mbps:     1426.847
--- fc00:0:0:1::41 tcpbench statistics ---
1169567056 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1415.130/1547.031/1745.945/121.735 Mbps
# path MTU discovery in other rtable does not work in ip6_output()
/sbin/route -T 43 -n get -host -inet6 fc00:0:0:1::41
   route to: fc00:0:0:1::41
destination: fc00::
       mask: ffff:ffff:ffff::
    gateway: ::1
  interface: lo43
 if address: ::1
   priority: 8 (static)
      flags: <UP,GATEWAY,DONE,STATIC>
     use       mtu    expire
      47     32768         0 
DISABLED