==== 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 
        1002      158421088     1264.839  100.00% 
Conn:   1 Mbps:     1264.839 Peak Mbps:     1264.839 Avg Mbps:     1264.839
        2002      155158600     1242.511  100.00% 
Conn:   1 Mbps:     1242.511 Peak Mbps:     1264.839 Avg Mbps:     1242.511
        3002      158698568     1269.589  100.00% 
Conn:   1 Mbps:     1269.589 Peak Mbps:     1269.589 Avg Mbps:     1269.589
        4003      145515104     1164.121  100.00% 
Conn:   1 Mbps:     1164.121 Peak Mbps:     1269.589 Avg Mbps:     1164.121
        5003      158972224     1273.051  100.00% 
Conn:   1 Mbps:     1273.051 Peak Mbps:     1273.051 Avg Mbps:     1273.051
--- fc00:0:0:1::20 tcpbench statistics ---
937578992 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1164.121/1242.822/1273.051/40.765 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
      23     32768         0 
DISABLED