==== 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      179055624     1431.014  100.00% 
Conn:   1 Mbps:     1431.014 Peak Mbps:     1431.014 Avg Mbps:     1431.014
        2000      217251488     1739.752  100.00% 
Conn:   1 Mbps:     1739.752 Peak Mbps:     1739.752 Avg Mbps:     1739.752
        3001      186235104     1489.881  100.00% 
Conn:   1 Mbps:     1489.881 Peak Mbps:     1739.752 Avg Mbps:     1489.881
        4002      205259352     1642.075  100.00% 
Conn:   1 Mbps:     1642.075 Peak Mbps:     1739.752 Avg Mbps:     1642.075
        5004      204197736     1630.321  100.00% 
Conn:   1 Mbps:     1630.321 Peak Mbps:     1739.752 Avg Mbps:     1630.321
--- fc00:0:0:1::41 tcpbench statistics ---
1206668328 bytes sent over 5.999 seconds
bandwidth min/avg/max/std-dev = 1431.014/1586.609/1739.752/111.361 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
      47     32768         0 
DISABLED