==== 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      139735600     1116.768  100.00% 
Conn:   1 Mbps:     1116.768 Peak Mbps:     1116.768 Avg Mbps:     1116.768
        2002      162576712     1300.614  100.00% 
Conn:   1 Mbps:     1300.614 Peak Mbps:     1300.614 Avg Mbps:     1300.614
        3003      161248152     1289.985  100.00% 
Conn:   1 Mbps:     1289.985 Peak Mbps:     1300.614 Avg Mbps:     1289.985
        4002      163215472     1307.031  100.00% 
Conn:   1 Mbps:     1307.031 Peak Mbps:     1307.031 Avg Mbps:     1307.031
        5004      153161648     1222.847  100.00% 
Conn:   1 Mbps:     1222.847 Peak Mbps:     1307.031 Avg Mbps:     1222.847
--- fc00:0:0:1::20 tcpbench statistics ---
953593464 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1116.768/1247.449/1307.031/71.929 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
      67     32768         0 
DISABLED