==== 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 
        1002      148312680     1184.133  100.00% 
Conn:   1 Mbps:     1184.133 Peak Mbps:     1184.133 Avg Mbps:     1184.133
        2001      172553480     1383.194  100.00% 
Conn:   1 Mbps:     1383.194 Peak Mbps:     1383.194 Avg Mbps:     1383.194
        3002      169879264     1357.676  100.00% 
Conn:   1 Mbps:     1357.676 Peak Mbps:     1383.194 Avg Mbps:     1357.676
        4002      187086216     1496.690  100.00% 
Conn:   1 Mbps:     1496.690 Peak Mbps:     1496.690 Avg Mbps:     1496.690
        5002      196810344     1576.059  100.00% 
Conn:   1 Mbps:     1576.059 Peak Mbps:     1576.059 Avg Mbps:     1576.059
--- fc00:0:0:1::41 tcpbench statistics ---
1072833880 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1184.133/1399.550/1576.059/133.429 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
      60     32768         0 
DISABLED