==== 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      159587736     1275.426  100.00% 
Conn:   1 Mbps:     1275.426 Peak Mbps:     1275.426 Avg Mbps:     1275.426
        2002      156740352     1253.923  100.00% 
Conn:   1 Mbps:     1253.923 Peak Mbps:     1275.426 Avg Mbps:     1253.923
        3000      147799368     1184.764  100.00% 
Conn:   1 Mbps:     1184.764 Peak Mbps:     1275.426 Avg Mbps:     1184.764
        4001      163302416     1305.114  100.00% 
Conn:   1 Mbps:     1305.114 Peak Mbps:     1305.114 Avg Mbps:     1305.114
        5002      162171896     1297.375  100.00% 
Conn:   1 Mbps:     1297.375 Peak Mbps:     1305.114 Avg Mbps:     1297.375
--- fc00:0:0:1::20 tcpbench statistics ---
947763952 bytes sent over 5.999 seconds
bandwidth min/avg/max/std-dev = 1184.764/1263.321/1305.114/43.156 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
      21     32768         0 
DISABLED