==== 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      160807728     1285.177  100.00% 
Conn:   1 Mbps:     1285.177 Peak Mbps:     1285.177 Avg Mbps:     1285.177
        2002      158387000     1267.096  100.00% 
Conn:   1 Mbps:     1267.096 Peak Mbps:     1285.177 Avg Mbps:     1267.096
        3001      157410728     1260.546  100.00% 
Conn:   1 Mbps:     1260.546 Peak Mbps:     1285.177 Avg Mbps:     1260.546
        4002      150474952     1203.800  100.00% 
Conn:   1 Mbps:     1203.800 Peak Mbps:     1285.177 Avg Mbps:     1203.800
        5002      156331376     1250.651  100.00% 
Conn:   1 Mbps:     1250.651 Peak Mbps:     1285.177 Avg Mbps:     1250.651
--- fc00:0:0:1::20 tcpbench statistics ---
938777936 bytes sent over 5.999 seconds
bandwidth min/avg/max/std-dev = 1203.800/1253.454/1285.177/27.262 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
      13     32768         0 
DISABLED