==== 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      157995800     1263.966  100.00% 
Conn:   1 Mbps:     1263.966 Peak Mbps:     1263.966 Avg Mbps:     1263.966
        2001      221394960     1771.160  100.00% 
Conn:   1 Mbps:     1771.160 Peak Mbps:     1771.160 Avg Mbps:     1771.160
        3002      198781992     1588.667  100.00% 
Conn:   1 Mbps:     1588.667 Peak Mbps:     1771.160 Avg Mbps:     1588.667
        4004      157979944     1262.577  100.00% 
Conn:   1 Mbps:     1262.577 Peak Mbps:     1771.160 Avg Mbps:     1262.577
        5005      188075432     1503.100  100.00% 
Conn:   1 Mbps:     1503.100 Peak Mbps:     1771.160 Avg Mbps:     1503.100
--- fc00:0:0:1::20 tcpbench statistics ---
1096168752 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1262.577/1477.894/1771.160/195.467 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
      66     32768         0 
DISABLED