==== 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      299977592     2397.423  100.00% 
Conn:   1 Mbps:     2397.423 Peak Mbps:     2397.423 Avg Mbps:     2397.423
        2001      339377616     2715.021  100.00% 
Conn:   1 Mbps:     2715.021 Peak Mbps:     2715.021 Avg Mbps:     2715.021
        3002      244050224     1952.402  100.00% 
Conn:   1 Mbps:     1952.402 Peak Mbps:     2715.021 Avg Mbps:     1952.402
        4003      201378248     1609.417  100.00% 
Conn:   1 Mbps:     1609.417 Peak Mbps:     2715.021 Avg Mbps:     1609.417
        5003      199188928     1595.107  100.00% 
Conn:   1 Mbps:     1595.107 Peak Mbps:     2715.021 Avg Mbps:     1595.107
--- fc00:0:0:1::41 tcpbench statistics ---
1485306504 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1595.107/2053.874/2715.021/441.236 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
      71     32768         0 
DISABLED