==== 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 
        1001      213412960     1705.598  100.00% 
Conn:   1 Mbps:     1705.598 Peak Mbps:     1705.598 Avg Mbps:     1705.598
        2002      214796584     1718.373  100.00% 
Conn:   1 Mbps:     1718.373 Peak Mbps:     1718.373 Avg Mbps:     1718.373
        3001      271891960     2177.313  100.00% 
Conn:   1 Mbps:     2177.313 Peak Mbps:     2177.313 Avg Mbps:     2177.313
        4002      252343360     2018.747  100.00% 
Conn:   1 Mbps:     2018.747 Peak Mbps:     2177.313 Avg Mbps:     2018.747
        5002      181006952     1448.056  100.00% 
Conn:   1 Mbps:     1448.056 Peak Mbps:     2177.313 Avg Mbps:     1448.056
--- fc00:0:0:1::41 tcpbench statistics ---
1327980008 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1448.056/1813.617/2177.313/256.409 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
      54     32768         0 
DISABLED