==== 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 
        1002      153240672     1223.478  100.00% 
Conn:   1 Mbps:     1223.478 Peak Mbps:     1223.478 Avg Mbps:     1223.478
        2017      176287664     1389.459  100.00% 
Conn:   1 Mbps:     1389.459 Peak Mbps:     1389.459 Avg Mbps:     1389.459
        3018      185364672     1482.917  100.00% 
Conn:   1 Mbps:     1482.917 Peak Mbps:     1482.917 Avg Mbps:     1482.917
        4019      190174136     1519.873  100.00% 
Conn:   1 Mbps:     1519.873 Peak Mbps:     1519.873 Avg Mbps:     1519.873
        5019      273285752     2188.474  100.00% 
Conn:   1 Mbps:     2188.474 Peak Mbps:     2188.474 Avg Mbps:     2188.474
--- fc00:0:0:1::41 tcpbench statistics ---
1149126904 bytes sent over 6.010 seconds
bandwidth min/avg/max/std-dev = 1223.478/1560.841/2188.474/330.109 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
      39     32768         0 
DISABLED