==== 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      148449952     1187.600  100.00% 
Conn:   1 Mbps:     1187.600 Peak Mbps:     1187.600 Avg Mbps:     1187.600
        2001      172595872     1380.767  100.00% 
Conn:   1 Mbps:     1380.767 Peak Mbps:     1380.767 Avg Mbps:     1380.767
        3002      186245384     1488.475  100.00% 
Conn:   1 Mbps:     1488.475 Peak Mbps:     1488.475 Avg Mbps:     1488.475
        4002      196684424     1573.475  100.00% 
Conn:   1 Mbps:     1573.475 Peak Mbps:     1573.475 Avg Mbps:     1573.475
        5003      232059288     1856.474  100.00% 
Conn:   1 Mbps:     1856.474 Peak Mbps:     1856.474 Avg Mbps:     1856.474
--- fc00:0:0:1::41 tcpbench statistics ---
1175000960 bytes sent over 6.010 seconds
bandwidth min/avg/max/std-dev = 1187.600/1497.358/1856.474/221.080 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
      54     32768         0 
DISABLED