==== 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      177429104     1418.015  100.00% 
Conn:   1 Mbps:     1418.015 Peak Mbps:     1418.015 Avg Mbps:     1418.015
        2001      202055168     1618.059  100.00% 
Conn:   1 Mbps:     1618.059 Peak Mbps:     1618.059 Avg Mbps:     1618.059
        3002      233312600     1864.636  100.00% 
Conn:   1 Mbps:     1864.636 Peak Mbps:     1864.636 Avg Mbps:     1864.636
        4002      170160696     1361.286  100.00% 
Conn:   1 Mbps:     1361.286 Peak Mbps:     1864.636 Avg Mbps:     1361.286
        5003      166705152     1333.641  100.00% 
Conn:   1 Mbps:     1333.641 Peak Mbps:     1864.636 Avg Mbps:     1333.641
--- fc00:0:0:1::41 tcpbench statistics ---
1125958592 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1333.641/1519.127/1864.636/199.352 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
      57     32768         0 
DISABLED