==== 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      152897696     1221.960  100.00% 
Conn:   1 Mbps:     1221.960 Peak Mbps:     1221.960 Avg Mbps:     1221.960
        2015      158954776     1255.319  100.00% 
Conn:   1 Mbps:     1255.319 Peak Mbps:     1255.319 Avg Mbps:     1255.319
        3016      172813432     1381.126  100.00% 
Conn:   1 Mbps:     1381.126 Peak Mbps:     1381.126 Avg Mbps:     1381.126
        4018      184746736     1476.497  100.00% 
Conn:   1 Mbps:     1476.497 Peak Mbps:     1476.497 Avg Mbps:     1476.497
        5020      187674272     1498.397  100.00% 
Conn:   1 Mbps:     1498.397 Peak Mbps:     1498.397 Avg Mbps:     1498.397
--- fc00:0:0:1::41 tcpbench statistics ---
1033809752 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1221.960/1366.660/1498.397/112.217 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
      60     32768         0 
DISABLED