==== 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 
        1018      230530472     1811.634  100.00% 
Conn:   1 Mbps:     1811.634 Peak Mbps:     1811.634 Avg Mbps:     1811.634
        2018      263963728     2111.710  100.00% 
Conn:   1 Mbps:     2111.710 Peak Mbps:     2111.710 Avg Mbps:     2111.710
        3018      189610816     1516.887  100.00% 
Conn:   1 Mbps:     1516.887 Peak Mbps:     2111.710 Avg Mbps:     1516.887
        4018      205336264     1642.690  100.00% 
Conn:   1 Mbps:     1642.690 Peak Mbps:     2111.710 Avg Mbps:     1642.690
        5018      223006008     1785.834  100.00% 
Conn:   1 Mbps:     1785.834 Peak Mbps:     2111.710 Avg Mbps:     1785.834
--- fc00:0:0:1::41 tcpbench statistics ---
1319783560 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1516.887/1773.751/2111.710/199.476 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
      54     32768         0 
DISABLED