==== 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 
        1003      195660128     1560.599  100.00% 
Conn:   1 Mbps:     1560.599 Peak Mbps:     1560.599 Avg Mbps:     1560.599
        2004      236919216     1895.354  100.00% 
Conn:   1 Mbps:     1895.354 Peak Mbps:     1895.354 Avg Mbps:     1895.354
        3004      164021272     1312.170  100.00% 
Conn:   1 Mbps:     1312.170 Peak Mbps:     1895.354 Avg Mbps:     1312.170
        4004      177740376     1421.923  100.00% 
Conn:   1 Mbps:     1421.923 Peak Mbps:     1895.354 Avg Mbps:     1421.923
        5005      183899360     1471.195  100.00% 
Conn:   1 Mbps:     1471.195 Peak Mbps:     1895.354 Avg Mbps:     1471.195
--- fc00:0:0:1::41 tcpbench statistics ---
1141379120 bytes sent over 6.009 seconds
bandwidth min/avg/max/std-dev = 1312.170/1532.248/1895.354/198.486 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
      50     32768         0 
DISABLED