==== 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 
        1000      188898296     1511.186  100.00% 
Conn:   1 Mbps:     1511.186 Peak Mbps:     1511.186 Avg Mbps:     1511.186
        2000      203744328     1629.955  100.00% 
Conn:   1 Mbps:     1629.955 Peak Mbps:     1629.955 Avg Mbps:     1629.955
        3001      215692680     1725.541  100.00% 
Conn:   1 Mbps:     1725.541 Peak Mbps:     1725.541 Avg Mbps:     1725.541
        4006      193182336     1539.301  100.00% 
Conn:   1 Mbps:     1539.301 Peak Mbps:     1725.541 Avg Mbps:     1539.301
        5002      201926368     1621.899  100.00% 
Conn:   1 Mbps:     1621.899 Peak Mbps:     1725.541 Avg Mbps:     1621.899
--- fc00:0:0:1::41 tcpbench statistics ---
1182827024 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1511.186/1605.576/1725.541/75.570 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