==== 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 
        1002      177884560     1420.236  100.00% 
Conn:   1 Mbps:     1420.236 Peak Mbps:     1420.236 Avg Mbps:     1420.236
        2003      189774720     1518.198  100.00% 
Conn:   1 Mbps:     1518.198 Peak Mbps:     1518.198 Avg Mbps:     1518.198
        3005      285005224     2277.764  100.00% 
Conn:   1 Mbps:     2277.764 Peak Mbps:     2277.764 Avg Mbps:     2277.764
        4016      176057808     1393.138  100.00% 
Conn:   1 Mbps:     1393.138 Peak Mbps:     2277.764 Avg Mbps:     1393.138
        5006      170089288     1375.849  100.00% 
Conn:   1 Mbps:     1375.849 Peak Mbps:     2277.764 Avg Mbps:     1375.849
--- fc00:0:0:1::41 tcpbench statistics ---
1191561920 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1375.849/1597.037/2277.764/343.908 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
      43     32768         0 
DISABLED