==== 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      155638040     1243.860  100.00% 
Conn:   1 Mbps:     1243.860 Peak Mbps:     1243.860 Avg Mbps:     1243.860
        2000      164311656     1315.809  100.00% 
Conn:   1 Mbps:     1315.809 Peak Mbps:     1315.809 Avg Mbps:     1315.809
        3000      181907672     1455.261  100.00% 
Conn:   1 Mbps:     1455.261 Peak Mbps:     1455.261 Avg Mbps:     1455.261
        4002      186411016     1489.798  100.00% 
Conn:   1 Mbps:     1489.798 Peak Mbps:     1489.798 Avg Mbps:     1489.798
        5002      207237816     1659.562  100.00% 
Conn:   1 Mbps:     1659.562 Peak Mbps:     1659.562 Avg Mbps:     1659.562
--- fc00:0:0:1::41 tcpbench statistics ---
1152777000 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1243.860/1432.858/1659.562/144.609 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
      53     32768         0 
DISABLED