==== 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      278890624     2228.896  100.00% 
Conn:   1 Mbps:     2228.896 Peak Mbps:     2228.896 Avg Mbps:     2228.896
        2003      186297640     1488.892  100.00% 
Conn:   1 Mbps:     1488.892 Peak Mbps:     2228.896 Avg Mbps:     1488.892
        3004      183055320     1464.443  100.00% 
Conn:   1 Mbps:     1464.443 Peak Mbps:     2228.896 Avg Mbps:     1464.443
        4006      182477536     1458.362  100.00% 
Conn:   1 Mbps:     1458.362 Peak Mbps:     2228.896 Avg Mbps:     1458.362
        5005      190229696     1523.361  100.00% 
Conn:   1 Mbps:     1523.361 Peak Mbps:     2228.896 Avg Mbps:     1523.361
--- fc00:0:0:1::20 tcpbench statistics ---
1214429928 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1458.362/1632.791/2228.896/298.928 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
      54     32768         0 
DISABLED