==== 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      192938960     1541.970  100.00% 
Conn:   1 Mbps:     1541.970 Peak Mbps:     1541.970 Avg Mbps:     1541.970
        2003      186312944     1489.015  100.00% 
Conn:   1 Mbps:     1489.015 Peak Mbps:     1541.970 Avg Mbps:     1489.015
        3004      214586736     1716.694  100.00% 
Conn:   1 Mbps:     1716.694 Peak Mbps:     1716.694 Avg Mbps:     1716.694
        4004      207313848     1658.511  100.00% 
Conn:   1 Mbps:     1658.511 Peak Mbps:     1716.694 Avg Mbps:     1658.511
        5004      325743040     2608.553  100.00% 
Conn:   1 Mbps:     2608.553 Peak Mbps:     2608.553 Avg Mbps:     2608.553
--- fc00:0:0:1::41 tcpbench statistics ---
1342499080 bytes sent over 6.007 seconds
bandwidth min/avg/max/std-dev = 1489.015/1802.948/2608.553/410.844 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
      45     32768         0 
DISABLED