==== 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 
        1005      164064496     1305.986  100.00% 
Conn:   1 Mbps:     1305.986 Peak Mbps:     1305.986 Avg Mbps:     1305.986
        2002      167469368     1343.786  100.00% 
Conn:   1 Mbps:     1343.786 Peak Mbps:     1343.786 Avg Mbps:     1343.786
        3010      185999664     1477.654  100.00% 
Conn:   1 Mbps:     1477.654 Peak Mbps:     1477.654 Avg Mbps:     1477.654
        4010      184974976     1481.281  100.00% 
Conn:   1 Mbps:     1481.281 Peak Mbps:     1481.281 Avg Mbps:     1481.281
        5015      195708632     1557.880  100.00% 
Conn:   1 Mbps:     1557.880 Peak Mbps:     1557.880 Avg Mbps:     1557.880
--- fc00:0:0:1::41 tcpbench statistics ---
1060948312 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1305.986/1433.317/1557.880/93.820 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
      56     32768         0 
DISABLED