==== 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 
        1000      215740488     1725.924  100.00% 
Conn:   1 Mbps:     1725.924 Peak Mbps:     1725.924 Avg Mbps:     1725.924
        2000      159203688     1273.630  100.00% 
Conn:   1 Mbps:     1273.630 Peak Mbps:     1725.924 Avg Mbps:     1273.630
        3001      183139144     1463.650  100.00% 
Conn:   1 Mbps:     1463.650 Peak Mbps:     1725.924 Avg Mbps:     1463.650
        4001      178103408     1426.254  100.00% 
Conn:   1 Mbps:     1426.254 Peak Mbps:     1725.924 Avg Mbps:     1426.254
        5001      181209128     1449.673  100.00% 
Conn:   1 Mbps:     1449.673 Peak Mbps:     1725.924 Avg Mbps:     1449.673
--- fc00:0:0:1::41 tcpbench statistics ---
1107981864 bytes sent over 6.002 seconds
bandwidth min/avg/max/std-dev = 1273.630/1467.826/1725.924/145.878 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