==== 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      125737088     1004.892  100.00% 
Conn:   1 Mbps:     1004.892 Peak Mbps:     1004.892 Avg Mbps:     1004.892
        2001      144985264     1159.882  100.00% 
Conn:   1 Mbps:     1159.882 Peak Mbps:     1159.882 Avg Mbps:     1159.882
        3001      151075704     1209.815  100.00% 
Conn:   1 Mbps:     1209.815 Peak Mbps:     1209.815 Avg Mbps:     1209.815
        4002      156597008     1251.525  100.00% 
Conn:   1 Mbps:     1251.525 Peak Mbps:     1251.525 Avg Mbps:     1251.525
        5002      144577656     1156.621  100.00% 
Conn:   1 Mbps:     1156.621 Peak Mbps:     1251.525 Avg Mbps:     1156.621
--- fc00:0:0:1::20 tcpbench statistics ---
878325272 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1004.892/1156.547/1251.525/83.509 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
      23     32768         0 
DISABLED