==== 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      314300752     2514.406  100.00% 
Conn:   1 Mbps:     2514.406 Peak Mbps:     2514.406 Avg Mbps:     2514.406
        2000      321726728     2573.814  100.00% 
Conn:   1 Mbps:     2573.814 Peak Mbps:     2573.814 Avg Mbps:     2573.814
        3001      320654256     2565.234  100.00% 
Conn:   1 Mbps:     2565.234 Peak Mbps:     2573.814 Avg Mbps:     2565.234
        4001      311954504     2495.636  100.00% 
Conn:   1 Mbps:     2495.636 Peak Mbps:     2573.814 Avg Mbps:     2495.636
        5002      307096696     2456.774  100.00% 
Conn:   1 Mbps:     2456.774 Peak Mbps:     2573.814 Avg Mbps:     2456.774
--- fc00:0:0:1::41 tcpbench statistics ---
1875795712 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 2456.774/2521.173/2573.814/43.721 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
      23     32768         0 
DISABLED