==== 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      157288160     1258.305  100.00% 
Conn:   1 Mbps:     1258.305 Peak Mbps:     1258.305 Avg Mbps:     1258.305
        2001      160657528     1285.260  100.00% 
Conn:   1 Mbps:     1285.260 Peak Mbps:     1285.260 Avg Mbps:     1285.260
        3002      159157240     1273.258  100.00% 
Conn:   1 Mbps:     1273.258 Peak Mbps:     1285.260 Avg Mbps:     1273.258
        4003      160601832     1283.531  100.00% 
Conn:   1 Mbps:     1283.531 Peak Mbps:     1285.260 Avg Mbps:     1283.531
        5004      153834752     1230.678  100.00% 
Conn:   1 Mbps:     1230.678 Peak Mbps:     1285.260 Avg Mbps:     1230.678
--- fc00:0:0:1::20 tcpbench statistics ---
950805624 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1230.678/1266.207/1285.260/20.187 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
      17     32768         0 
DISABLED