==== 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      206730672     1652.193  100.00% 
Conn:   1 Mbps:     1652.193 Peak Mbps:     1652.193 Avg Mbps:     1652.193
        2001      237920608     1903.365  100.00% 
Conn:   1 Mbps:     1903.365 Peak Mbps:     1903.365 Avg Mbps:     1903.365
        3001      345253544     2762.028  100.00% 
Conn:   1 Mbps:     2762.028 Peak Mbps:     2762.028 Avg Mbps:     2762.028
        4002      209452064     1673.943  100.00% 
Conn:   1 Mbps:     1673.943 Peak Mbps:     2762.028 Avg Mbps:     1673.943
        5002      224349800     1796.595  100.00% 
Conn:   1 Mbps:     1796.595 Peak Mbps:     2762.028 Avg Mbps:     1796.595
--- fc00:0:0:1::41 tcpbench statistics ---
1441778248 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1652.193/1957.625/2762.028/412.239 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
      49     32768         0 
DISABLED