==== 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      154684152     1236.237  100.00% 
Conn:   1 Mbps:     1236.237 Peak Mbps:     1236.237 Avg Mbps:     1236.237
        2000      151944592     1216.774  100.00% 
Conn:   1 Mbps:     1216.774 Peak Mbps:     1236.237 Avg Mbps:     1216.774
        3001      159403056     1275.224  100.00% 
Conn:   1 Mbps:     1275.224 Peak Mbps:     1275.224 Avg Mbps:     1275.224
        4002      152940560     1222.302  100.00% 
Conn:   1 Mbps:     1222.302 Peak Mbps:     1275.224 Avg Mbps:     1222.302
        5003      153029752     1224.238  100.00% 
Conn:   1 Mbps:     1224.238 Peak Mbps:     1275.224 Avg Mbps:     1224.238
--- fc00:0:0:1::20 tcpbench statistics ---
927467760 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1216.774/1234.955/1275.224/21.113 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