==== 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      166760200     1331.419  100.00% 
Conn:   1 Mbps:     1331.419 Peak Mbps:     1331.419 Avg Mbps:     1331.419
        2012      182526688     1447.189  100.00% 
Conn:   1 Mbps:     1447.189 Peak Mbps:     1447.189 Avg Mbps:     1447.189
        3011      175134408     1402.478  100.00% 
Conn:   1 Mbps:     1402.478 Peak Mbps:     1447.189 Avg Mbps:     1402.478
        4011      188823416     1510.587  100.00% 
Conn:   1 Mbps:     1510.587 Peak Mbps:     1510.587 Avg Mbps:     1510.587
        5011      181936216     1455.490  100.00% 
Conn:   1 Mbps:     1455.490 Peak Mbps:     1510.587 Avg Mbps:     1455.490
--- fc00:0:0:1::41 tcpbench statistics ---
1087072168 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1331.419/1429.432/1510.587/59.856 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
      67     32768         0 
DISABLED