==== 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 
        1003      179554216     1432.137  100.00% 
Conn:   1 Mbps:     1432.137 Peak Mbps:     1432.137 Avg Mbps:     1432.137
        2005      199520552     1594.570  100.00% 
Conn:   1 Mbps:     1594.570 Peak Mbps:     1594.570 Avg Mbps:     1594.570
        3005      260044872     2080.359  100.00% 
Conn:   1 Mbps:     2080.359 Peak Mbps:     2080.359 Avg Mbps:     2080.359
        4008      175409160     1399.076  100.00% 
Conn:   1 Mbps:     1399.076 Peak Mbps:     2080.359 Avg Mbps:     1399.076
        5009      188795080     1510.361  100.00% 
Conn:   1 Mbps:     1510.361 Peak Mbps:     2080.359 Avg Mbps:     1510.361
--- fc00:0:0:1::41 tcpbench statistics ---
1176013632 bytes sent over 6.002 seconds
bandwidth min/avg/max/std-dev = 1399.076/1603.301/2080.359/247.913 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
      48     32768         0 
DISABLED