==== 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      178684456     1428.048  100.00% 
Conn:   1 Mbps:     1428.048 Peak Mbps:     1428.048 Avg Mbps:     1428.048
        2001      196152240     1569.218  100.00% 
Conn:   1 Mbps:     1569.218 Peak Mbps:     1569.218 Avg Mbps:     1569.218
        3001      205324656     1644.241  100.00% 
Conn:   1 Mbps:     1644.241 Peak Mbps:     1644.241 Avg Mbps:     1644.241
        4002      217606680     1740.853  100.00% 
Conn:   1 Mbps:     1740.853 Peak Mbps:     1740.853 Avg Mbps:     1740.853
        5002      192373064     1538.985  100.00% 
Conn:   1 Mbps:     1538.985 Peak Mbps:     1740.853 Avg Mbps:     1538.985
--- fc00:0:0:1::41 tcpbench statistics ---
1225185216 bytes sent over 6.002 seconds
bandwidth min/avg/max/std-dev = 1428.048/1584.269/1740.853/104.688 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
      48     32768         0 
DISABLED