==== 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      162968800     1302.448  100.00% 
Conn:   1 Mbps:     1302.448 Peak Mbps:     1302.448 Avg Mbps:     1302.448
        2001      239555392     1916.443  100.00% 
Conn:   1 Mbps:     1916.443 Peak Mbps:     1916.443 Avg Mbps:     1916.443
        3003      177221192     1416.353  100.00% 
Conn:   1 Mbps:     1416.353 Peak Mbps:     1916.443 Avg Mbps:     1416.353
        4003      152885048     1224.305  100.00% 
Conn:   1 Mbps:     1224.305 Peak Mbps:     1916.443 Avg Mbps:     1224.305
        5003      170439216     1363.514  100.00% 
Conn:   1 Mbps:     1363.514 Peak Mbps:     1916.443 Avg Mbps:     1363.514
--- fc00:0:0:1::20 tcpbench statistics ---
1073067152 bytes sent over 6.006 seconds
bandwidth min/avg/max/std-dev = 1224.305/1444.613/1916.443/244.437 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
      64     32768         0 
DISABLED