==== run-tcpbench6-3-1 ====
rm -f nc.log
nc -6 -v -l -V 20 fc00:0:0:1::20 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::20 12345
# Test that path MTU dicovery is working.
tcpbench -6 -t 5 -V 22 -b fc00::22 fc00:0:0:1::20
  elapsed_ms          bytes         mbps   bwidth 
        1001      177450464     1418.186  100.00% 
Conn:   1 Mbps:     1418.186 Peak Mbps:     1418.186 Avg Mbps:     1418.186
        2002      172305928     1377.070  100.00% 
Conn:   1 Mbps:     1377.070 Peak Mbps:     1418.186 Avg Mbps:     1377.070
        3002      211778736     1694.230  100.00% 
Conn:   1 Mbps:     1694.230 Peak Mbps:     1694.230 Avg Mbps:     1694.230
        4004      201798424     1612.775  100.00% 
Conn:   1 Mbps:     1612.775 Peak Mbps:     1694.230 Avg Mbps:     1612.775
        5003      251142032     2011.147  100.00% 
Conn:   1 Mbps:     2011.147 Peak Mbps:     2011.147 Avg Mbps:     2011.147
--- fc00:0:0:1::20 tcpbench statistics ---
1288233848 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1377.070/1622.682/2011.147/227.274 Mbps
# path MTU discovery in other rtable does not work in ip6_output()
/sbin/route -T 22 -n get -host -inet6 fc00:0:0:1::20
   route to: fc00:0:0:1::20
destination: fc00::
       mask: ffff:ffff:ffff::
    gateway: ::1
  interface: lo22
 if address: ::1
   priority: 8 (static)
      flags: <UP,GATEWAY,DONE,STATIC>
     use       mtu    expire
      31     32768         0 
DISABLED