==== 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 
        1013      213034688     1682.406  100.00% 
Conn:   1 Mbps:     1682.406 Peak Mbps:     1682.406 Avg Mbps:     1682.406
        2014      250368904     2002.951  100.00% 
Conn:   1 Mbps:     2002.951 Peak Mbps:     2002.951 Avg Mbps:     2002.951
        3014      260459216     2083.674  100.00% 
Conn:   1 Mbps:     2083.674 Peak Mbps:     2083.674 Avg Mbps:     2083.674
        4016      181596200     1451.318  100.00% 
Conn:   1 Mbps:     1451.318 Peak Mbps:     2083.674 Avg Mbps:     1451.318
        5016      195336488     1564.256  100.00% 
Conn:   1 Mbps:     1564.256 Peak Mbps:     2083.674 Avg Mbps:     1564.256
--- fc00:0:0:1::41 tcpbench statistics ---
1290065032 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1451.318/1756.921/2083.674/246.318 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
      51     32768         0 
DISABLED