==== 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      200762688     1606.102  100.00% 
Conn:   1 Mbps:     1606.102 Peak Mbps:     1606.102 Avg Mbps:     1606.102
        2001      202229840     1617.839  100.00% 
Conn:   1 Mbps:     1617.839 Peak Mbps:     1617.839 Avg Mbps:     1617.839
        3002      326060576     2608.485  100.00% 
Conn:   1 Mbps:     2608.485 Peak Mbps:     2608.485 Avg Mbps:     2608.485
        4002      204874808     1638.998  100.00% 
Conn:   1 Mbps:     1638.998 Peak Mbps:     2608.485 Avg Mbps:     1638.998
        5003      202892912     1623.143  100.00% 
Conn:   1 Mbps:     1623.143 Peak Mbps:     2608.485 Avg Mbps:     1623.143
--- fc00:0:0:1::41 tcpbench statistics ---
1343391104 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1606.102/1818.913/2608.485/394.927 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
      45     32768         0 
DISABLED