==== 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      201205432     1608.035  100.00% 
Conn:   1 Mbps:     1608.035 Peak Mbps:     1608.035 Avg Mbps:     1608.035
        2002      214066456     1712.532  100.00% 
Conn:   1 Mbps:     1712.532 Peak Mbps:     1712.532 Avg Mbps:     1712.532
        3002      307673496     2461.388  100.00% 
Conn:   1 Mbps:     2461.388 Peak Mbps:     2461.388 Avg Mbps:     2461.388
        4003      226016680     1808.133  100.00% 
Conn:   1 Mbps:     1808.133 Peak Mbps:     2461.388 Avg Mbps:     1808.133
        5006      196169088     1566.220  100.00% 
Conn:   1 Mbps:     1566.220 Peak Mbps:     2461.388 Avg Mbps:     1566.220
--- fc00:0:0:1::41 tcpbench statistics ---
1342796656 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1566.220/1831.262/2461.388/326.119 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
      46     32768         0 
DISABLED