==== 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 
        1000      196021880     1568.175  100.00% 
Conn:   1 Mbps:     1568.175 Peak Mbps:     1568.175 Avg Mbps:     1568.175
        2001      202756944     1622.056  100.00% 
Conn:   1 Mbps:     1622.056 Peak Mbps:     1622.056 Avg Mbps:     1622.056
        3002      217190992     1735.792  100.00% 
Conn:   1 Mbps:     1735.792 Peak Mbps:     1735.792 Avg Mbps:     1735.792
        4001      248807672     1992.454  100.00% 
Conn:   1 Mbps:     1992.454 Peak Mbps:     1992.454 Avg Mbps:     1992.454
        5002      255813168     2046.505  100.00% 
Conn:   1 Mbps:     2046.505 Peak Mbps:     2046.505 Avg Mbps:     2046.505
--- fc00:0:0:1::41 tcpbench statistics ---
1308265632 bytes sent over 6.004 seconds
bandwidth min/avg/max/std-dev = 1568.175/1792.996/2046.505/193.436 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