==== 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 
        1005      165219312     1315.179  100.00% 
Conn:   1 Mbps:     1315.179 Peak Mbps:     1315.179 Avg Mbps:     1315.179
        2006      201832664     1614.661  100.00% 
Conn:   1 Mbps:     1614.661 Peak Mbps:     1614.661 Avg Mbps:     1614.661
        3007      233442944     1867.544  100.00% 
Conn:   1 Mbps:     1867.544 Peak Mbps:     1867.544 Avg Mbps:     1867.544
        4008      305685024     2443.037  100.00% 
Conn:   1 Mbps:     2443.037 Peak Mbps:     2443.037 Avg Mbps:     2443.037
        5011      199340208     1589.952  100.00% 
Conn:   1 Mbps:     1589.952 Peak Mbps:     2443.037 Avg Mbps:     1589.952
--- fc00:0:0:1::41 tcpbench statistics ---
1310581048 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1315.179/1766.074/2443.037/381.006 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
      50     32768         0 
DISABLED