==== 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      162821120     1299.969  100.00% 
Conn:   1 Mbps:     1299.969 Peak Mbps:     1299.969 Avg Mbps:     1299.969
        2004      162249048     1295.402  100.00% 
Conn:   1 Mbps:     1295.402 Peak Mbps:     1299.969 Avg Mbps:     1295.402
        3008      180509544     1439.757  100.00% 
Conn:   1 Mbps:     1439.757 Peak Mbps:     1439.757 Avg Mbps:     1439.757
        4005      184658896     1483.204  100.00% 
Conn:   1 Mbps:     1483.204 Peak Mbps:     1483.204 Avg Mbps:     1483.204
        5007      189392592     1513.627  100.00% 
Conn:   1 Mbps:     1513.627 Peak Mbps:     1513.627 Avg Mbps:     1513.627
--- fc00:0:0:1::41 tcpbench statistics ---
1038095832 bytes sent over 6.002 seconds
bandwidth min/avg/max/std-dev = 1295.402/1406.392/1513.627/91.823 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
      38     32768         0 
DISABLED