==== 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 
        1002      164214920     1311.097  100.00% 
Conn:   1 Mbps:     1311.097 Peak Mbps:     1311.097 Avg Mbps:     1311.097
        2005      177893800     1418.894  100.00% 
Conn:   1 Mbps:     1418.894 Peak Mbps:     1418.894 Avg Mbps:     1418.894
        3002      186818568     1500.551  100.00% 
Conn:   1 Mbps:     1500.551 Peak Mbps:     1500.551 Avg Mbps:     1500.551
        4005      199577136     1591.842  100.00% 
Conn:   1 Mbps:     1591.842 Peak Mbps:     1591.842 Avg Mbps:     1591.842
        5004      169887944     1360.464  100.00% 
Conn:   1 Mbps:     1360.464 Peak Mbps:     1591.842 Avg Mbps:     1360.464
--- fc00:0:0:1::41 tcpbench statistics ---
1078058784 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1311.097/1436.569/1591.842/100.051 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
      56     32768         0 
DISABLED