Find the answer to your Linux question:
Results 1 to 2 of 2
Enjoy an ad free experience by logging in. Not a member yet? Register.
  1. #1

    Post how to block the ftp packets

    using layer 7 filtering how to block the ftp packets?..

    In My router i am going to add a below rule....
    iptables -A OUTPUT -m layer7 --l7proto tcp --dport 20 -j DROP

    above statement will it work in my router?..kindly help me..

    Saravanan G

  2. #2
    Linux Engineer Kloschüssel's Avatar
    Join Date
    Oct 2005
    you block ftp in the OUTPUT chain?!

    If that's what you want, yes, it should work. But you don't need that fancy layer matching. Blocking tcp port 20 should cover a large number of cases as that one is the reserved default ftp port. But you won't be able to block ftp traffic that goes to different ports than the default. Anyone can configure his server as he wants and he is not required to use port 20.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts