==== 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      197260856     1576.510  100.00% 
Conn:   1 Mbps:     1576.510 Peak Mbps:     1576.510 Avg Mbps:     1576.510
        2001      193013768     1544.110  100.00% 
Conn:   1 Mbps:     1544.110 Peak Mbps:     1576.510 Avg Mbps:     1544.110
        3002      305037888     2440.303  100.00% 
Conn:   1 Mbps:     2440.303 Peak Mbps:     2440.303 Avg Mbps:     2440.303
        4002      195782560     1566.260  100.00% 
Conn:   1 Mbps:     1566.260 Peak Mbps:     2440.303 Avg Mbps:     1566.260
        5003      177334184     1418.673  100.00% 
Conn:   1 Mbps:     1418.673 Peak Mbps:     2440.303 Avg Mbps:     1418.673
--- fc00:0:0:1::41 tcpbench statistics ---
1258803256 bytes sent over 6.002 seconds
bandwidth min/avg/max/std-dev = 1418.673/1709.172/2440.303/369.922 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
      57     32768         0 
DISABLED