==== 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 
        1009      203228296     1611.324  100.00% 
Conn:   1 Mbps:     1611.324 Peak Mbps:     1611.324 Avg Mbps:     1611.324
        2007      215571344     1729.760  100.00% 
Conn:   1 Mbps:     1729.760 Peak Mbps:     1729.760 Avg Mbps:     1729.760
        3007      242523344     1940.187  100.00% 
Conn:   1 Mbps:     1940.187 Peak Mbps:     1940.187 Avg Mbps:     1940.187
        4008      302211072     2415.273  100.00% 
Conn:   1 Mbps:     2415.273 Peak Mbps:     2415.273 Avg Mbps:     2415.273
        5008      200215432     1603.327  100.00% 
Conn:   1 Mbps:     1603.327 Peak Mbps:     2415.273 Avg Mbps:     1603.327
--- fc00:0:0:1::41 tcpbench statistics ---
1361051416 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1603.327/1859.974/2415.273/303.131 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
      41     32768         0 
DISABLED