==== 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      187638136     1499.605  100.00% 
Conn:   1 Mbps:     1499.605 Peak Mbps:     1499.605 Avg Mbps:     1499.605
        2017      206222104     1625.396  100.00% 
Conn:   1 Mbps:     1625.396 Peak Mbps:     1625.396 Avg Mbps:     1625.396
        3018      210554496     1682.753  100.00% 
Conn:   1 Mbps:     1682.753 Peak Mbps:     1682.753 Avg Mbps:     1682.753
        4020      219707520     1754.152  100.00% 
Conn:   1 Mbps:     1754.152 Peak Mbps:     1754.152 Avg Mbps:     1754.152
        5020      280279776     2242.238  100.00% 
Conn:   1 Mbps:     2242.238 Peak Mbps:     2242.238 Avg Mbps:     2242.238
--- fc00:0:0:1::41 tcpbench statistics ---
1293701312 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1499.605/1760.829/2242.238/254.745 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
      39     32768         0 
DISABLED