==== 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      159083920     1271.400  100.00% 
Conn:   1 Mbps:     1271.400 Peak Mbps:     1271.400 Avg Mbps:     1271.400
        2002      160397080     1281.895  100.00% 
Conn:   1 Mbps:     1281.895 Peak Mbps:     1281.895 Avg Mbps:     1281.895
        3003      162254808     1298.038  100.00% 
Conn:   1 Mbps:     1298.038 Peak Mbps:     1298.038 Avg Mbps:     1298.038
        4004      176185896     1408.079  100.00% 
Conn:   1 Mbps:     1408.079 Peak Mbps:     1408.079 Avg Mbps:     1408.079
        5004      175902256     1408.627  100.00% 
Conn:   1 Mbps:     1408.627 Peak Mbps:     1408.627 Avg Mbps:     1408.627
--- fc00:0:0:1::20 tcpbench statistics ---
1073600112 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1271.400/1333.608/1408.627/61.617 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
      38     32768         0 
DISABLED