Disallow non-authenticated user - Setup PPPoE Server

hi,

i just setup a PPPoE server + NAT(mas). Everything works well. :smiley:
but i wonder how to disallow non-authenticated user to access internet.
because currently, user just obtains the IP from PPPoE server then he can go to internet already without PPPoE connection. :frowning:

any one has any idea?

regards,
mknnoc

http://forum.mikrotik.com/t/blocking-non-authed-pppoe-clients-from-the-network/11853/1