==== 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 
        1007      159465088     1266.853  100.00% 
Conn:   1 Mbps:     1266.853 Peak Mbps:     1266.853 Avg Mbps:     1266.853
        2010      189354384     1510.304  100.00% 
Conn:   1 Mbps:     1510.304 Peak Mbps:     1510.304 Avg Mbps:     1510.304
        3009      213799112     1712.105  100.00% 
Conn:   1 Mbps:     1712.105 Peak Mbps:     1712.105 Avg Mbps:     1712.105
        4011      225986000     1806.082  100.00% 
Conn:   1 Mbps:     1806.082 Peak Mbps:     1806.082 Avg Mbps:     1806.082
        5011      169835152     1358.681  100.00% 
Conn:   1 Mbps:     1358.681 Peak Mbps:     1806.082 Avg Mbps:     1358.681
--- fc00:0:0:1::41 tcpbench statistics ---
1141948504 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1266.853/1530.805/1806.082/204.140 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
      62     32768         0 
DISABLED