==== 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 
        1003      154090344     1229.036  100.00% 
Conn:   1 Mbps:     1229.036 Peak Mbps:     1229.036 Avg Mbps:     1229.036
        2002      187809728     1503.982  100.00% 
Conn:   1 Mbps:     1503.982 Peak Mbps:     1503.982 Avg Mbps:     1503.982
        3002      178982720     1433.295  100.00% 
Conn:   1 Mbps:     1433.295 Peak Mbps:     1503.982 Avg Mbps:     1433.295
        4002      190413128     1524.830  100.00% 
Conn:   1 Mbps:     1524.830 Peak Mbps:     1524.830 Avg Mbps:     1524.830
        5004      183819600     1467.622  100.00% 
Conn:   1 Mbps:     1467.622 Peak Mbps:     1524.830 Avg Mbps:     1467.622
--- fc00:0:0:1::20 tcpbench statistics ---
1082125872 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1229.036/1431.753/1524.830/106.079 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
      35     32768         0 
DISABLED