==== 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      173211128     1384.305  100.00% 
Conn:   1 Mbps:     1384.305 Peak Mbps:     1384.305 Avg Mbps:     1384.305
        2001      187076840     1496.615  100.00% 
Conn:   1 Mbps:     1496.615 Peak Mbps:     1496.615 Avg Mbps:     1496.615
        3001      204175664     1633.405  100.00% 
Conn:   1 Mbps:     1633.405 Peak Mbps:     1633.405 Avg Mbps:     1633.405
        4003      206451912     1649.965  100.00% 
Conn:   1 Mbps:     1649.965 Peak Mbps:     1649.965 Avg Mbps:     1649.965
        5002      198697104     1591.168  100.00% 
Conn:   1 Mbps:     1591.168 Peak Mbps:     1649.965 Avg Mbps:     1591.168
--- fc00:0:0:1::41 tcpbench statistics ---
1168913656 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1384.305/1551.092/1649.965/98.938 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