==== 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      205127712     1639.382  100.00% 
Conn:   1 Mbps:     1639.382 Peak Mbps:     1639.382 Avg Mbps:     1639.382
        2002      202816832     1622.535  100.00% 
Conn:   1 Mbps:     1622.535 Peak Mbps:     1639.382 Avg Mbps:     1622.535
        3002      323178688     2585.430  100.00% 
Conn:   1 Mbps:     2585.430 Peak Mbps:     2585.430 Avg Mbps:     2585.430
        4003      209285016     1674.280  100.00% 
Conn:   1 Mbps:     1674.280 Peak Mbps:     2585.430 Avg Mbps:     1674.280
        5002      209921408     1681.052  100.00% 
Conn:   1 Mbps:     1681.052 Peak Mbps:     2585.430 Avg Mbps:     1681.052
--- fc00:0:0:1::41 tcpbench statistics ---
1345889584 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1622.535/1840.536/2585.430/373.076 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
      42     32768         0 
DISABLED