==== 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 
        1000      149783400     1198.267  100.00% 
Conn:   1 Mbps:     1198.267 Peak Mbps:     1198.267 Avg Mbps:     1198.267
        2003      203935240     1628.225  100.00% 
Conn:   1 Mbps:     1628.225 Peak Mbps:     1628.225 Avg Mbps:     1628.225
        3003      202015288     1616.122  100.00% 
Conn:   1 Mbps:     1616.122 Peak Mbps:     1628.225 Avg Mbps:     1616.122
        4004      232448840     1859.591  100.00% 
Conn:   1 Mbps:     1859.591 Peak Mbps:     1859.591 Avg Mbps:     1859.591
        5004      230091208     1840.730  100.00% 
Conn:   1 Mbps:     1840.730 Peak Mbps:     1859.591 Avg Mbps:     1840.730
--- fc00:0:0:1::20 tcpbench statistics ---
1185557088 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1198.267/1628.587/1859.591/238.201 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
      51     32768         0 
DISABLED