==== 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 
        1002      165425632     1320.764  100.00% 
Conn:   1 Mbps:     1320.764 Peak Mbps:     1320.764 Avg Mbps:     1320.764
        2002      174631176     1398.448  100.00% 
Conn:   1 Mbps:     1398.448 Peak Mbps:     1398.448 Avg Mbps:     1398.448
        3003      167103552     1336.828  100.00% 
Conn:   1 Mbps:     1336.828 Peak Mbps:     1398.448 Avg Mbps:     1336.828
        4003      175995416     1407.963  100.00% 
Conn:   1 Mbps:     1407.963 Peak Mbps:     1407.963 Avg Mbps:     1407.963
        5013      185209968     1467.010  100.00% 
Conn:   1 Mbps:     1467.010 Peak Mbps:     1467.010 Avg Mbps:     1467.010
--- fc00:0:0:1::20 tcpbench statistics ---
1060576968 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1320.764/1386.203/1467.010/52.675 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
      37     32768         0 
DISABLED