==== 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 
        1002      183237688     1462.976  100.00% 
Conn:   1 Mbps:     1462.976 Peak Mbps:     1462.976 Avg Mbps:     1462.976
        2003      196034080     1568.273  100.00% 
Conn:   1 Mbps:     1568.273 Peak Mbps:     1568.273 Avg Mbps:     1568.273
        3003      224126304     1794.805  100.00% 
Conn:   1 Mbps:     1794.805 Peak Mbps:     1794.805 Avg Mbps:     1794.805
        4003      250589792     2004.718  100.00% 
Conn:   1 Mbps:     2004.718 Peak Mbps:     2004.718 Avg Mbps:     2004.718
        5003      277148480     2219.407  100.00% 
Conn:   1 Mbps:     2219.407 Peak Mbps:     2219.407 Avg Mbps:     2219.407
--- fc00:0:0:1::41 tcpbench statistics ---
1322904952 bytes sent over 6.002 seconds
bandwidth min/avg/max/std-dev = 1462.976/1810.036/2219.407/277.351 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
      35     32768         0 
DISABLED