==== 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 
        1014      174736752     1378.594  100.00% 
Conn:   1 Mbps:     1378.594 Peak Mbps:     1378.594 Avg Mbps:     1378.594
        2016      191246632     1526.919  100.00% 
Conn:   1 Mbps:     1526.919 Peak Mbps:     1526.919 Avg Mbps:     1526.919
        3017      189605456     1516.844  100.00% 
Conn:   1 Mbps:     1516.844 Peak Mbps:     1526.919 Avg Mbps:     1516.844
        4023      270537024     2151.388  100.00% 
Conn:   1 Mbps:     2151.388 Peak Mbps:     2151.388 Avg Mbps:     2151.388
        5026      168354232     1344.146  100.00% 
Conn:   1 Mbps:     1344.146 Peak Mbps:     2151.388 Avg Mbps:     1344.146
--- fc00:0:0:1::41 tcpbench statistics ---
1163238784 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1344.146/1583.578/2151.388/293.059 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
      62     32768         0 
DISABLED