==== 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      145233008     1161.864  100.00% 
Conn:   1 Mbps:     1161.864 Peak Mbps:     1161.864 Avg Mbps:     1161.864
        2002      187843416     1501.246  100.00% 
Conn:   1 Mbps:     1501.246 Peak Mbps:     1501.246 Avg Mbps:     1501.246
        3001      172352256     1380.198  100.00% 
Conn:   1 Mbps:     1380.198 Peak Mbps:     1501.246 Avg Mbps:     1380.198
        4005      196973816     1571.077  100.00% 
Conn:   1 Mbps:     1571.077 Peak Mbps:     1571.077 Avg Mbps:     1571.077
        5008      167551496     1337.736  100.00% 
Conn:   1 Mbps:     1337.736 Peak Mbps:     1571.077 Avg Mbps:     1337.736
--- fc00:0:0:1::41 tcpbench statistics ---
1058775792 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1161.864/1390.424/1571.077/141.448 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
      51     32768         0 
DISABLED