==== 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      155798352     1246.387  100.00% 
Conn:   1 Mbps:     1246.387 Peak Mbps:     1246.387 Avg Mbps:     1246.387
        2000      162605064     1302.143  100.00% 
Conn:   1 Mbps:     1302.143 Peak Mbps:     1302.143 Avg Mbps:     1302.143
        3001      158538560     1268.308  100.00% 
Conn:   1 Mbps:     1268.308 Peak Mbps:     1302.143 Avg Mbps:     1268.308
        4001      155477224     1243.818  100.00% 
Conn:   1 Mbps:     1243.818 Peak Mbps:     1302.143 Avg Mbps:     1243.818
        5002      157663600     1261.309  100.00% 
Conn:   1 Mbps:     1261.309 Peak Mbps:     1302.143 Avg Mbps:     1261.309
--- fc00:0:0:1::20 tcpbench statistics ---
947703328 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1243.818/1264.393/1302.143/20.964 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
      24     32768         0 
DISABLED