==== 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      179125864     1431.575  100.00% 
Conn:   1 Mbps:     1431.575 Peak Mbps:     1431.575 Avg Mbps:     1431.575
        2002      272891904     2180.954  100.00% 
Conn:   1 Mbps:     2180.954 Peak Mbps:     2180.954 Avg Mbps:     2180.954
        3003      173108144     1384.865  100.00% 
Conn:   1 Mbps:     1384.865 Peak Mbps:     2180.954 Avg Mbps:     1384.865
        4004      179690960     1436.092  100.00% 
Conn:   1 Mbps:     1436.092 Peak Mbps:     2180.954 Avg Mbps:     1436.092
        5004      177475488     1419.804  100.00% 
Conn:   1 Mbps:     1419.804 Peak Mbps:     2180.954 Avg Mbps:     1419.804
--- fc00:0:0:1::20 tcpbench statistics ---
1166499424 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1384.865/1570.658/2180.954/305.676 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
      63     32768         0 
DISABLED