==== 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      209055120     1670.770  100.00% 
Conn:   1 Mbps:     1670.770 Peak Mbps:     1670.770 Avg Mbps:     1670.770
        2005      240525304     1918.447  100.00% 
Conn:   1 Mbps:     1918.447 Peak Mbps:     1918.447 Avg Mbps:     1918.447
        3004      153450920     1228.836  100.00% 
Conn:   1 Mbps:     1228.836 Peak Mbps:     1918.447 Avg Mbps:     1228.836
        4004      177439872     1419.519  100.00% 
Conn:   1 Mbps:     1419.519 Peak Mbps:     1918.447 Avg Mbps:     1419.519
        5005      178497000     1427.976  100.00% 
Conn:   1 Mbps:     1427.976 Peak Mbps:     1918.447 Avg Mbps:     1427.976
--- fc00:0:0:1::41 tcpbench statistics ---
1144193072 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1228.836/1533.110/1918.447/238.316 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
      56     32768         0 
DISABLED