==== 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      203854128     1630.833  100.00% 
Conn:   1 Mbps:     1630.833 Peak Mbps:     1630.833 Avg Mbps:     1630.833
        2001      176587784     1412.702  100.00% 
Conn:   1 Mbps:     1412.702 Peak Mbps:     1630.833 Avg Mbps:     1412.702
        3003      186607528     1491.369  100.00% 
Conn:   1 Mbps:     1491.369 Peak Mbps:     1630.833 Avg Mbps:     1491.369
        4001      212745408     1705.374  100.00% 
Conn:   1 Mbps:     1705.374 Peak Mbps:     1705.374 Avg Mbps:     1705.374
        5001      203472744     1627.782  100.00% 
Conn:   1 Mbps:     1627.782 Peak Mbps:     1705.374 Avg Mbps:     1627.782
--- fc00:0:0:1::41 tcpbench statistics ---
1262798352 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1412.702/1573.612/1705.374/106.043 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
      49     32768         0 
DISABLED