==== 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      177835624     1419.845  100.00% 
Conn:   1 Mbps:     1419.845 Peak Mbps:     1419.845 Avg Mbps:     1419.845
        2002      206896088     1656.826  100.00% 
Conn:   1 Mbps:     1656.826 Peak Mbps:     1656.826 Avg Mbps:     1656.826
        3002      205443104     1643.545  100.00% 
Conn:   1 Mbps:     1643.545 Peak Mbps:     1656.826 Avg Mbps:     1643.545
        4003      196910160     1575.281  100.00% 
Conn:   1 Mbps:     1575.281 Peak Mbps:     1656.826 Avg Mbps:     1575.281
        5005      200856456     1603.644  100.00% 
Conn:   1 Mbps:     1603.644 Peak Mbps:     1656.826 Avg Mbps:     1603.644
--- fc00:0:0:1::41 tcpbench statistics ---
1185901248 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1419.845/1579.828/1656.826/85.054 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
      42     32768         0 
DISABLED