==== run-tcpbench6-3-1 ====
rm -f nc.log
nc -6 -v -l -V 20 fc00:0:0:1::20 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::20 12345
# Test that path MTU dicovery is working.
tcpbench -6 -t 5 -V 22 -b fc00::22 fc00:0:0:1::20
  elapsed_ms          bytes         mbps   bwidth 
        1001      279379288     2232.802  100.00% 
Conn:   1 Mbps:     2232.802 Peak Mbps:     2232.802 Avg Mbps:     2232.802
        2001      278649688     2231.429  100.00% 
Conn:   1 Mbps:     2231.429 Peak Mbps:     2232.802 Avg Mbps:     2231.429
        3001      254352592     2034.821  100.00% 
Conn:   1 Mbps:     2034.821 Peak Mbps:     2232.802 Avg Mbps:     2034.821
        4002      256391856     2051.135  100.00% 
Conn:   1 Mbps:     2051.135 Peak Mbps:     2232.802 Avg Mbps:     2051.135
        5002      274202624     2193.621  100.00% 
Conn:   1 Mbps:     2193.621 Peak Mbps:     2232.802 Avg Mbps:     2193.621
--- fc00:0:0:1::20 tcpbench statistics ---
1611673648 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 2034.821/2148.761/2232.802/87.661 Mbps
# path MTU discovery in other rtable does not work in ip6_output()
/sbin/route -T 22 -n get -host -inet6 fc00:0:0:1::20
   route to: fc00:0:0:1::20
destination: fc00::
       mask: ffff:ffff:ffff::
    gateway: ::1
  interface: lo22
 if address: ::1
   priority: 8 (static)
      flags: <UP,GATEWAY,DONE,STATIC>
     use       mtu    expire
      23     32768         0 
DISABLED