==== 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      167763872     1342.111  100.00% 
Conn:   1 Mbps:     1342.111 Peak Mbps:     1342.111 Avg Mbps:     1342.111
        2001      171163040     1369.304  100.00% 
Conn:   1 Mbps:     1369.304 Peak Mbps:     1369.304 Avg Mbps:     1369.304
        3002      169602424     1355.464  100.00% 
Conn:   1 Mbps:     1355.464 Peak Mbps:     1369.304 Avg Mbps:     1355.464
        4002      163824208     1311.906  100.00% 
Conn:   1 Mbps:     1311.906 Peak Mbps:     1369.304 Avg Mbps:     1311.906
        5003      171871256     1373.596  100.00% 
Conn:   1 Mbps:     1373.596 Peak Mbps:     1373.596 Avg Mbps:     1373.596
--- fc00:0:0:1::20 tcpbench statistics ---
1018110168 bytes sent over 5.999 seconds
bandwidth min/avg/max/std-dev = 1311.906/1350.476/1373.596/22.233 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
      25     32768         0 
DISABLED