==== 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 
        1000      160613720     1284.910  100.00% 
Conn:   1 Mbps:     1284.910 Peak Mbps:     1284.910 Avg Mbps:     1284.910
        2001      162629336     1299.735  100.00% 
Conn:   1 Mbps:     1299.735 Peak Mbps:     1299.735 Avg Mbps:     1299.735
        3002      161804384     1294.435  100.00% 
Conn:   1 Mbps:     1294.435 Peak Mbps:     1299.735 Avg Mbps:     1294.435
        4001      155346056     1245.259  100.00% 
Conn:   1 Mbps:     1245.259 Peak Mbps:     1299.735 Avg Mbps:     1245.259
        5003      158633400     1267.799  100.00% 
Conn:   1 Mbps:     1267.799 Peak Mbps:     1299.735 Avg Mbps:     1267.799
--- fc00:0:0:1::20 tcpbench statistics ---
957637840 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1245.259/1278.428/1299.735/19.826 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
      18     32768         0 
DISABLED