==== 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 
        1002      141446840     1129.316  100.00% 
Conn:   1 Mbps:     1129.316 Peak Mbps:     1129.316 Avg Mbps:     1129.316
        2003      147289736     1178.318  100.00% 
Conn:   1 Mbps:     1178.318 Peak Mbps:     1178.318 Avg Mbps:     1178.318
        3004      143164888     1144.175  100.00% 
Conn:   1 Mbps:     1144.175 Peak Mbps:     1178.318 Avg Mbps:     1144.175
        4003      137895336     1104.267  100.00% 
Conn:   1 Mbps:     1104.267 Peak Mbps:     1178.318 Avg Mbps:     1104.267
        5004      136709696     1093.678  100.00% 
Conn:   1 Mbps:     1093.678 Peak Mbps:     1178.318 Avg Mbps:     1093.678
--- fc00:0:0:1::20 tcpbench statistics ---
848937256 bytes sent over 5.999 seconds
bandwidth min/avg/max/std-dev = 1093.678/1129.951/1178.318/30.058 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
      20     32768         0 
DISABLED