==== 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      188833312     1509.157  100.00% 
Conn:   1 Mbps:     1509.157 Peak Mbps:     1509.157 Avg Mbps:     1509.157
        2001      203634976     1630.711  100.00% 
Conn:   1 Mbps:     1630.711 Peak Mbps:     1630.711 Avg Mbps:     1630.711
        3002      215085552     1720.684  100.00% 
Conn:   1 Mbps:     1720.684 Peak Mbps:     1720.684 Avg Mbps:     1720.684
        4002      223447776     1787.582  100.00% 
Conn:   1 Mbps:     1787.582 Peak Mbps:     1787.582 Avg Mbps:     1787.582
        5011      314036112     2492.350  100.00% 
Conn:   1 Mbps:     2492.350 Peak Mbps:     2492.350 Avg Mbps:     2492.350
--- fc00:0:0:1::41 tcpbench statistics ---
1346790800 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1509.157/1828.097/2492.350/344.991 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
      52     32768         0 
DISABLED