==== 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      222983816     1783.871  100.00% 
Conn:   1 Mbps:     1783.871 Peak Mbps:     1783.871 Avg Mbps:     1783.871
        2002      175634248     1403.670  100.00% 
Conn:   1 Mbps:     1403.670 Peak Mbps:     1783.871 Avg Mbps:     1403.670
        3006      200957904     1601.258  100.00% 
Conn:   1 Mbps:     1601.258 Peak Mbps:     1783.871 Avg Mbps:     1601.258
        4003      201211656     1616.158  100.00% 
Conn:   1 Mbps:     1616.158 Peak Mbps:     1783.871 Avg Mbps:     1616.158
        5010      209983064     1668.187  100.00% 
Conn:   1 Mbps:     1668.187 Peak Mbps:     1783.871 Avg Mbps:     1668.187
--- fc00:0:0:1::41 tcpbench statistics ---
1202017888 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1403.670/1614.629/1783.871/123.447 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
      38     32768         0 
DISABLED