==== 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      217791216     1740.589  100.00% 
Conn:   1 Mbps:     1740.589 Peak Mbps:     1740.589 Avg Mbps:     1740.589
        2001      231920672     1855.365  100.00% 
Conn:   1 Mbps:     1855.365 Peak Mbps:     1855.365 Avg Mbps:     1855.365
        3003      173950544     1390.214  100.00% 
Conn:   1 Mbps:     1390.214 Peak Mbps:     1855.365 Avg Mbps:     1390.214
        4003      184556792     1476.454  100.00% 
Conn:   1 Mbps:     1476.454 Peak Mbps:     1855.365 Avg Mbps:     1476.454
        5005      189123400     1511.476  100.00% 
Conn:   1 Mbps:     1511.476 Peak Mbps:     1855.365 Avg Mbps:     1511.476
--- fc00:0:0:1::41 tcpbench statistics ---
1187469216 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1390.214/1594.820/1855.365/174.329 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