==== 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      221497096     1771.977  100.00% 
Conn:   1 Mbps:     1771.977 Peak Mbps:     1771.977 Avg Mbps:     1771.977
        2002      265189160     2119.394  100.00% 
Conn:   1 Mbps:     2119.394 Peak Mbps:     2119.394 Avg Mbps:     2119.394
        3003      184655448     1475.768  100.00% 
Conn:   1 Mbps:     1475.768 Peak Mbps:     2119.394 Avg Mbps:     1475.768
        4003      195022824     1560.183  100.00% 
Conn:   1 Mbps:     1560.183 Peak Mbps:     2119.394 Avg Mbps:     1560.183
        5003      193705632     1549.645  100.00% 
Conn:   1 Mbps:     1549.645 Peak Mbps:     2119.394 Avg Mbps:     1549.645
--- fc00:0:0:1::41 tcpbench statistics ---
1264943376 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1475.768/1695.393/2119.394/233.838 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
      49     32768         0 
DISABLED