==== 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      188212616     1504.197  100.00% 
Conn:   1 Mbps:     1504.197 Peak Mbps:     1504.197 Avg Mbps:     1504.197
        2001      198702072     1589.617  100.00% 
Conn:   1 Mbps:     1589.617 Peak Mbps:     1589.617 Avg Mbps:     1589.617
        3001      208530728     1669.916  100.00% 
Conn:   1 Mbps:     1669.916 Peak Mbps:     1669.916 Avg Mbps:     1669.916
        4002      227145728     1815.350  100.00% 
Conn:   1 Mbps:     1815.350 Peak Mbps:     1815.350 Avg Mbps:     1815.350
        5001      309187040     2475.972  100.00% 
Conn:   1 Mbps:     2475.972 Peak Mbps:     2475.972 Avg Mbps:     2475.972
--- fc00:0:0:1::41 tcpbench statistics ---
1334120352 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1504.197/1811.010/2475.972/347.923 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
      33     32768         0 
DISABLED