==== 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 
        1002      174625792     1394.218  100.00% 
Conn:   1 Mbps:     1394.218 Peak Mbps:     1394.218 Avg Mbps:     1394.218
        2004      198327064     1583.450  100.00% 
Conn:   1 Mbps:     1583.450 Peak Mbps:     1583.450 Avg Mbps:     1583.450
        3005      204110320     1632.883  100.00% 
Conn:   1 Mbps:     1632.883 Peak Mbps:     1632.883 Avg Mbps:     1632.883
        4008      205800872     1641.483  100.00% 
Conn:   1 Mbps:     1641.483 Peak Mbps:     1641.483 Avg Mbps:     1641.483
        5008      205255688     1642.046  100.00% 
Conn:   1 Mbps:     1642.046 Peak Mbps:     1642.046 Avg Mbps:     1642.046
--- fc00:0:0:1::41 tcpbench statistics ---
1188138376 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1394.218/1578.816/1642.046/94.812 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
      39     32768         0 
DISABLED