==== 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      184744768     1477.958  100.00% 
Conn:   1 Mbps:     1477.958 Peak Mbps:     1477.958 Avg Mbps:     1477.958
        2001      199626088     1597.009  100.00% 
Conn:   1 Mbps:     1597.009 Peak Mbps:     1597.009 Avg Mbps:     1597.009
        3001      216590728     1732.726  100.00% 
Conn:   1 Mbps:     1732.726 Peak Mbps:     1732.726 Avg Mbps:     1732.726
        4002      233427040     1867.416  100.00% 
Conn:   1 Mbps:     1867.416 Peak Mbps:     1867.416 Avg Mbps:     1867.416
        5003      307442648     2457.084  100.00% 
Conn:   1 Mbps:     2457.084 Peak Mbps:     2457.084 Avg Mbps:     2457.084
--- fc00:0:0:1::41 tcpbench statistics ---
1338600472 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1477.958/1826.439/2457.084/341.248 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
      35     32768         0 
DISABLED