==== 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 
        1000      222725848     1781.807  100.00% 
Conn:   1 Mbps:     1781.807 Peak Mbps:     1781.807 Avg Mbps:     1781.807
        2003      240815112     1920.759  100.00% 
Conn:   1 Mbps:     1920.759 Peak Mbps:     1920.759 Avg Mbps:     1920.759
        3005      237739952     1900.020  100.00% 
Conn:   1 Mbps:     1900.020 Peak Mbps:     1920.759 Avg Mbps:     1900.020
        4005      193194760     1547.105  100.00% 
Conn:   1 Mbps:     1547.105 Peak Mbps:     1920.759 Avg Mbps:     1547.105
        5007      189045704     1509.347  100.00% 
Conn:   1 Mbps:     1509.347 Peak Mbps:     1920.759 Avg Mbps:     1509.347
--- fc00:0:0:1::41 tcpbench statistics ---
1281152720 bytes sent over 6.017 seconds
bandwidth min/avg/max/std-dev = 1509.347/1731.807/1920.759/173.264 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
      52     32768         0 
DISABLED