==== 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 
        1000      148422296     1187.378  100.00% 
Conn:   1 Mbps:     1187.378 Peak Mbps:     1187.378 Avg Mbps:     1187.378
        2002      169829824     1357.281  100.00% 
Conn:   1 Mbps:     1357.281 Peak Mbps:     1357.281 Avg Mbps:     1357.281
        3002      173387704     1387.102  100.00% 
Conn:   1 Mbps:     1387.102 Peak Mbps:     1387.102 Avg Mbps:     1387.102
        4003      196233648     1568.301  100.00% 
Conn:   1 Mbps:     1568.301 Peak Mbps:     1568.301 Avg Mbps:     1568.301
        5004      217513024     1740.104  100.00% 
Conn:   1 Mbps:     1740.104 Peak Mbps:     1740.104 Avg Mbps:     1740.104
--- fc00:0:0:1::41 tcpbench statistics ---
1136901440 bytes sent over 6.002 seconds
bandwidth min/avg/max/std-dev = 1187.378/1448.033/1740.104/189.557 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
      57     32768         0 
DISABLED