==== 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      307155672     2454.791  100.00% 
Conn:   1 Mbps:     2454.791 Peak Mbps:     2454.791 Avg Mbps:     2454.791
        2002      237498832     1898.093  100.00% 
Conn:   1 Mbps:     1898.093 Peak Mbps:     2454.791 Avg Mbps:     1898.093
        3003      268111232     2144.890  100.00% 
Conn:   1 Mbps:     2144.890 Peak Mbps:     2454.791 Avg Mbps:     2144.890
        4004      173516792     1388.134  100.00% 
Conn:   1 Mbps:     1388.134 Peak Mbps:     2454.791 Avg Mbps:     1388.134
        5004      201801368     1614.411  100.00% 
Conn:   1 Mbps:     1614.411 Peak Mbps:     2454.791 Avg Mbps:     1614.411
--- fc00:0:0:1::41 tcpbench statistics ---
1397100904 bytes sent over 5.999 seconds
bandwidth min/avg/max/std-dev = 1388.134/1900.064/2454.791/377.183 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
      59     32768         0 
DISABLED