==== 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      196726296     1570.669  100.00% 
Conn:   1 Mbps:     1570.669 Peak Mbps:     1570.669 Avg Mbps:     1570.669
        2001      197757936     1583.647  100.00% 
Conn:   1 Mbps:     1583.647 Peak Mbps:     1583.647 Avg Mbps:     1583.647
        3002      214529856     1716.239  100.00% 
Conn:   1 Mbps:     1716.239 Peak Mbps:     1716.239 Avg Mbps:     1716.239
        4002      227594424     1820.755  100.00% 
Conn:   1 Mbps:     1820.755 Peak Mbps:     1820.755 Avg Mbps:     1820.755
        5003      310961944     2487.696  100.00% 
Conn:   1 Mbps:     2487.696 Peak Mbps:     2487.696 Avg Mbps:     2487.696
--- fc00:0:0:1::41 tcpbench statistics ---
1343344160 bytes sent over 6.005 seconds
bandwidth min/avg/max/std-dev = 1570.669/1835.801/2487.696/338.634 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
      40     32768         0 
DISABLED