==== 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      199993128     1599.945  100.00% 
Conn:   1 Mbps:     1599.945 Peak Mbps:     1599.945 Avg Mbps:     1599.945
        2003      185726224     1482.844  100.00% 
Conn:   1 Mbps:     1482.844 Peak Mbps:     1599.945 Avg Mbps:     1482.844
        3004      194631104     1555.493  100.00% 
Conn:   1 Mbps:     1555.493 Peak Mbps:     1599.945 Avg Mbps:     1555.493
        4005      211244288     1689.954  100.00% 
Conn:   1 Mbps:     1689.954 Peak Mbps:     1689.954 Avg Mbps:     1689.954
        5005      210182336     1681.459  100.00% 
Conn:   1 Mbps:     1681.459 Peak Mbps:     1689.954 Avg Mbps:     1681.459
--- fc00:0:0:1::41 tcpbench statistics ---
1202725344 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1482.844/1601.939/1689.954/77.993 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
      43     32768         0 
DISABLED