==== 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      201269432     1608.547  100.00% 
Conn:   1 Mbps:     1608.547 Peak Mbps:     1608.547 Avg Mbps:     1608.547
        2002      298900656     2388.816  100.00% 
Conn:   1 Mbps:     2388.816 Peak Mbps:     2388.816 Avg Mbps:     2388.816
        3003      224386008     1795.088  100.00% 
Conn:   1 Mbps:     1795.088 Peak Mbps:     2388.816 Avg Mbps:     1795.088
        4004      200126128     1599.410  100.00% 
Conn:   1 Mbps:     1599.410 Peak Mbps:     2388.816 Avg Mbps:     1599.410
        5004      195807960     1568.032  100.00% 
Conn:   1 Mbps:     1568.032 Peak Mbps:     2388.816 Avg Mbps:     1568.032
--- fc00:0:0:1::41 tcpbench statistics ---
1337958264 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1568.032/1791.979/2388.816/308.904 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