==== 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      190132984     1518.028  100.00% 
Conn:   1 Mbps:     1518.028 Peak Mbps:     1518.028 Avg Mbps:     1518.028
        2003      201819592     1614.557  100.00% 
Conn:   1 Mbps:     1614.557 Peak Mbps:     1614.557 Avg Mbps:     1614.557
        3003      208724072     1669.793  100.00% 
Conn:   1 Mbps:     1669.793 Peak Mbps:     1669.793 Avg Mbps:     1669.793
        4006      212621504     1695.884  100.00% 
Conn:   1 Mbps:     1695.884 Peak Mbps:     1695.884 Avg Mbps:     1695.884
        5008      219401952     1751.712  100.00% 
Conn:   1 Mbps:     1751.712 Peak Mbps:     1751.712 Avg Mbps:     1751.712
--- fc00:0:0:1::41 tcpbench statistics ---
1235019832 bytes sent over 6.005 seconds
bandwidth min/avg/max/std-dev = 1518.028/1649.995/1751.712/79.392 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
      44     32768         0 
DISABLED