==== 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      258546616     2068.373  100.00% 
Conn:   1 Mbps:     2068.373 Peak Mbps:     2068.373 Avg Mbps:     2068.373
        2005      175589240     1399.117  100.00% 
Conn:   1 Mbps:     1399.117 Peak Mbps:     2068.373 Avg Mbps:     1399.117
        3003      154458600     1239.387  100.00% 
Conn:   1 Mbps:     1239.387 Peak Mbps:     2068.373 Avg Mbps:     1239.387
        4008      184716968     1470.384  100.00% 
Conn:   1 Mbps:     1470.384 Peak Mbps:     2068.373 Avg Mbps:     1470.384
        5005      185887296     1493.071  100.00% 
Conn:   1 Mbps:     1493.071 Peak Mbps:     2068.373 Avg Mbps:     1493.071
--- fc00:0:0:1::41 tcpbench statistics ---
1162882296 bytes sent over 5.999 seconds
bandwidth min/avg/max/std-dev = 1239.387/1534.066/2068.373/281.520 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
      50     32768         0 
DISABLED