==== 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      146276328     1167.875  100.00% 
Conn:   1 Mbps:     1167.875 Peak Mbps:     1167.875 Avg Mbps:     1167.875
        2009      181026656     1438.146  100.00% 
Conn:   1 Mbps:     1438.146 Peak Mbps:     1438.146 Avg Mbps:     1438.146
        3010      172425088     1378.023  100.00% 
Conn:   1 Mbps:     1378.023 Peak Mbps:     1438.146 Avg Mbps:     1378.023
        4010      200633552     1606.675  100.00% 
Conn:   1 Mbps:     1606.675 Peak Mbps:     1606.675 Avg Mbps:     1606.675
        5011      193078896     1544.631  100.00% 
Conn:   1 Mbps:     1544.631 Peak Mbps:     1606.675 Avg Mbps:     1544.631
--- fc00:0:0:1::41 tcpbench statistics ---
1130913568 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1167.875/1427.070/1606.675/152.177 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
      27     32768         0 
DISABLED