==== 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      247065152     1976.521  100.00% 
Conn:   1 Mbps:     1976.521 Peak Mbps:     1976.521 Avg Mbps:     1976.521
        2004      201623440     1608.163  100.00% 
Conn:   1 Mbps:     1608.163 Peak Mbps:     1976.521 Avg Mbps:     1608.163
        3006      149702584     1196.424  100.00% 
Conn:   1 Mbps:     1196.424 Peak Mbps:     1976.521 Avg Mbps:     1196.424
        4007      183855000     1470.840  100.00% 
Conn:   1 Mbps:     1470.840 Peak Mbps:     1976.521 Avg Mbps:     1470.840
        5009      175757960     1403.257  100.00% 
Conn:   1 Mbps:     1403.257 Peak Mbps:     1976.521 Avg Mbps:     1403.257
--- fc00:0:0:1::41 tcpbench statistics ---
1163255848 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1196.424/1531.041/1976.521/259.354 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
      62     32768         0 
DISABLED