==== 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 
        1002      225180096     1797.845  100.00% 
Conn:   1 Mbps:     1797.845 Peak Mbps:     1797.845 Avg Mbps:     1797.845
        2003      162409064     1299.273  100.00% 
Conn:   1 Mbps:     1299.273 Peak Mbps:     1797.845 Avg Mbps:     1299.273
        3004      178481968     1427.856  100.00% 
Conn:   1 Mbps:     1427.856 Peak Mbps:     1797.845 Avg Mbps:     1427.856
        4004      172935728     1383.486  100.00% 
Conn:   1 Mbps:     1383.486 Peak Mbps:     1797.845 Avg Mbps:     1383.486
        5007      166146600     1326.520  100.00% 
Conn:   1 Mbps:     1326.520 Peak Mbps:     1797.845 Avg Mbps:     1326.520
--- fc00:0:0:1::41 tcpbench statistics ---
1092546816 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1299.273/1446.996/1797.845/181.015 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
      51     32768         0 
DISABLED