==== 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      208678504     1669.428  100.00% 
Conn:   1 Mbps:     1669.428 Peak Mbps:     1669.428 Avg Mbps:     1669.428
        2002      226286360     1808.482  100.00% 
Conn:   1 Mbps:     1808.482 Peak Mbps:     1808.482 Avg Mbps:     1808.482
        3004      267531272     2138.112  100.00% 
Conn:   1 Mbps:     2138.112 Peak Mbps:     2138.112 Avg Mbps:     2138.112
        4004      196412672     1571.301  100.00% 
Conn:   1 Mbps:     1571.301 Peak Mbps:     2138.112 Avg Mbps:     1571.301
        5017      207471240     1640.089  100.00% 
Conn:   1 Mbps:     1640.089 Peak Mbps:     2138.112 Avg Mbps:     1640.089
--- fc00:0:0:1::41 tcpbench statistics ---
1288592240 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1571.301/1765.483/2138.112/201.672 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
      43     32768         0 
DISABLED