==== 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      231408336     1849.417  100.00% 
Conn:   1 Mbps:     1849.417 Peak Mbps:     1849.417 Avg Mbps:     1849.417
        2003      228426352     1823.763  100.00% 
Conn:   1 Mbps:     1823.763 Peak Mbps:     1849.417 Avg Mbps:     1823.763
        3002      194948592     1561.150  100.00% 
Conn:   1 Mbps:     1561.150 Peak Mbps:     1849.417 Avg Mbps:     1561.150
        4003      199831664     1597.056  100.00% 
Conn:   1 Mbps:     1597.056 Peak Mbps:     1849.417 Avg Mbps:     1597.056
        5005      206613816     1651.259  100.00% 
Conn:   1 Mbps:     1651.259 Peak Mbps:     1849.417 Avg Mbps:     1651.259
--- fc00:0:0:1::41 tcpbench statistics ---
1263643072 bytes sent over 5.999 seconds
bandwidth min/avg/max/std-dev = 1561.150/1696.529/1849.417/118.182 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
      62     32768         0 
DISABLED