==== 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      162496392     1299.971  100.00% 
Conn:   1 Mbps:     1299.971 Peak Mbps:     1299.971 Avg Mbps:     1299.971
        2001      179046896     1432.375  100.00% 
Conn:   1 Mbps:     1432.375 Peak Mbps:     1432.375 Avg Mbps:     1432.375
        3012      182833064     1446.750  100.00% 
Conn:   1 Mbps:     1446.750 Peak Mbps:     1446.750 Avg Mbps:     1446.750
        4014      180693992     1444.108  100.00% 
Conn:   1 Mbps:     1444.108 Peak Mbps:     1446.750 Avg Mbps:     1444.108
        5014      186730864     1493.847  100.00% 
Conn:   1 Mbps:     1493.847 Peak Mbps:     1493.847 Avg Mbps:     1493.847
--- fc00:0:0:1::41 tcpbench statistics ---
1070568592 bytes sent over 6.008 seconds
bandwidth min/avg/max/std-dev = 1299.971/1423.410/1493.847/65.195 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
      68     32768         0 
DISABLED