==== 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      188677512     1509.420  100.00% 
Conn:   1 Mbps:     1509.420 Peak Mbps:     1509.420 Avg Mbps:     1509.420
        2000      180044168     1440.353  100.00% 
Conn:   1 Mbps:     1440.353 Peak Mbps:     1509.420 Avg Mbps:     1440.353
        3001      199350680     1593.212  100.00% 
Conn:   1 Mbps:     1593.212 Peak Mbps:     1593.212 Avg Mbps:     1593.212
        4001      221924064     1775.393  100.00% 
Conn:   1 Mbps:     1775.393 Peak Mbps:     1775.393 Avg Mbps:     1775.393
        5002      307756048     2462.048  100.00% 
Conn:   1 Mbps:     2462.048 Peak Mbps:     2462.048 Avg Mbps:     2462.048
--- fc00:0:0:1::41 tcpbench statistics ---
1298441096 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1440.353/1756.085/2462.048/370.355 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
      52     32768         0 
DISABLED