==== 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      168611192     1347.542  100.00% 
Conn:   1 Mbps:     1347.542 Peak Mbps:     1347.542 Avg Mbps:     1347.542
        2001      193688088     1549.505  100.00% 
Conn:   1 Mbps:     1549.505 Peak Mbps:     1549.505 Avg Mbps:     1549.505
        3016      203547656     1605.899  100.00% 
Conn:   1 Mbps:     1605.899 Peak Mbps:     1605.899 Avg Mbps:     1605.899
        4019      234409568     1869.668  100.00% 
Conn:   1 Mbps:     1869.668 Peak Mbps:     1869.668 Avg Mbps:     1869.668
        5019      224831816     1800.455  100.00% 
Conn:   1 Mbps:     1800.455 Peak Mbps:     1869.668 Avg Mbps:     1800.455
--- fc00:0:0:1::41 tcpbench statistics ---
1208379576 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1347.542/1634.614/1869.668/186.135 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
      39     32768         0 
DISABLED