==== 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      160298592     1281.108  100.00% 
Conn:   1 Mbps:     1281.108 Peak Mbps:     1281.108 Avg Mbps:     1281.108
        2003      165906800     1325.928  100.00% 
Conn:   1 Mbps:     1325.928 Peak Mbps:     1325.928 Avg Mbps:     1325.928
        3003      203203120     1625.625  100.00% 
Conn:   1 Mbps:     1625.625 Peak Mbps:     1625.625 Avg Mbps:     1625.625
        4003      214468464     1717.465  100.00% 
Conn:   1 Mbps:     1717.465 Peak Mbps:     1717.465 Avg Mbps:     1717.465
        5003      246009504     1968.076  100.00% 
Conn:   1 Mbps:     1968.076 Peak Mbps:     1968.076 Avg Mbps:     1968.076
--- fc00:0:0:1::41 tcpbench statistics ---
1254260936 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1281.108/1583.640/1968.076/255.109 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
      37     32768         0 
DISABLED