==== 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      245181376     1957.536  100.00% 
Conn:   1 Mbps:     1957.536 Peak Mbps:     1957.536 Avg Mbps:     1957.536
        2001      246649752     1975.173  100.00% 
Conn:   1 Mbps:     1975.173 Peak Mbps:     1975.173 Avg Mbps:     1975.173
        3001      313434200     2509.984  100.00% 
Conn:   1 Mbps:     2509.984 Peak Mbps:     2509.984 Avg Mbps:     2509.984
        4002      314925768     2519.406  100.00% 
Conn:   1 Mbps:     2519.406 Peak Mbps:     2519.406 Avg Mbps:     2519.406
        5003      240223696     1919.870  100.00% 
Conn:   1 Mbps:     1919.870 Peak Mbps:     2519.406 Avg Mbps:     1919.870
--- fc00:0:0:1::41 tcpbench statistics ---
1620729064 bytes sent over 6.005 seconds
bandwidth min/avg/max/std-dev = 1919.870/2176.394/2519.406/276.815 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
      75     32768         0 
DISABLED