==== 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 
        1001      179128296     1431.595  100.00% 
Conn:   1 Mbps:     1431.595 Peak Mbps:     1431.595 Avg Mbps:     1431.595
        2000      206267720     1651.794  100.00% 
Conn:   1 Mbps:     1651.794 Peak Mbps:     1651.794 Avg Mbps:     1651.794
        3001      265180384     2119.324  100.00% 
Conn:   1 Mbps:     2119.324 Peak Mbps:     2119.324 Avg Mbps:     2119.324
        4002      256475296     2051.802  100.00% 
Conn:   1 Mbps:     2051.802 Peak Mbps:     2119.324 Avg Mbps:     2051.802
        5002      183424920     1468.868  100.00% 
Conn:   1 Mbps:     1468.868 Peak Mbps:     2119.324 Avg Mbps:     1468.868
--- fc00:0:0:1::41 tcpbench statistics ---
1298918392 bytes sent over 6.013 seconds
bandwidth min/avg/max/std-dev = 1431.595/1744.677/2119.324/288.931 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
      59     32768         0 
DISABLED