==== 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      186397488     1489.690  100.00% 
Conn:   1 Mbps:     1489.690 Peak Mbps:     1489.690 Avg Mbps:     1489.690
        2001      221245560     1771.736  100.00% 
Conn:   1 Mbps:     1771.736 Peak Mbps:     1771.736 Avg Mbps:     1771.736
        3001      269132056     2153.056  100.00% 
Conn:   1 Mbps:     2153.056 Peak Mbps:     2153.056 Avg Mbps:     2153.056
        4002      259973840     2079.791  100.00% 
Conn:   1 Mbps:     2079.791 Peak Mbps:     2153.056 Avg Mbps:     2079.791
        5002      186185080     1490.972  100.00% 
Conn:   1 Mbps:     1490.972 Peak Mbps:     2153.056 Avg Mbps:     1490.972
--- fc00:0:0:1::41 tcpbench statistics ---
1320013912 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1489.690/1797.049/2153.056/281.239 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