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Thread: Firewall?

  1. #11
    Join Date
    Aug 2006
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    1,374
    Distro
    Ubuntu 13.04 Raring Ringtail

    Re: Firewall?

    Quote Originally Posted by HermanAB View Post
    Unfortunately a firewall is not a magic unicorn that can protect you against evil spirits. The Linux network stack is pretty well debugged and doesn't need a firewall. Most 'hardware' firewalls run Linux. If Linux needed a firewall, then you would need to put a firewall in front of every firewall, recursively. That will be very good for a hardware vendor, but not so good for your wallet.

    If you need to protect a bunch of unmanageable Windows machines on a LAN, then set up a firewall on a Linux gateway. If your Linux machine is the only one, then don't bother.
    An old pentium with pfsense is enough.

  2. #12
    Join Date
    May 2013
    Beans
    8

    Re: Firewall?

    Just one question,
    I have udp ports in the "listing reports";
    udp 4404 avahi-daemon
    udp 5353 avahi-daemon
    udp 68 dhclient
    udp6 33730 avahi-daemon
    udp6 5353 avahi-daemon.

    I added udp 5353/udp as "deny in" to the gufw. Is this why udp 5353 and the udp6 5353 avahi-daemon are both showing in green?

    Is this okay?

  3. #13
    Join Date
    Feb 2010
    Location
    White Plume Mountain
    Beans
    8,221
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Firewall?

    Quote Originally Posted by HarmonicaGuy View Post
    Just one question,
    I have udp ports in the "listing reports";
    udp 4404 avahi-daemon
    udp 5353 avahi-daemon
    udp 68 dhclient
    udp6 33730 avahi-daemon
    udp6 5353 avahi-daemon.

    I added udp 5353/udp as "deny in" to the gufw. Is this why udp 5353 and the udp6 5353 avahi-daemon are both showing in green?

    Is this okay?
    Yes. Green means deny and red means allow.
    Thank you for your contributions. "So long and thanks for the fish!"

  4. #14
    Join Date
    Aug 2006
    Beans
    1,374
    Distro
    Ubuntu 13.04 Raring Ringtail

    Re: Firewall?

    you can disable avahi.

  5. #15
    Join Date
    May 2013
    Beans
    8

    Re: Firewall?

    How would I disable avahi? And should I?

  6. #16
    Join Date
    Aug 2006
    Beans
    1,374
    Distro
    Ubuntu 13.04 Raring Ringtail

    Re: Firewall?

    gksu gedit /etc/default/avahi-daemon

    add this:

    AVAHI_DAEMON_DETECT_LOCAL=0

  7. #17
    Join Date
    Mar 2012
    Beans
    142

    Re: Firewall?

    Hi. Of course everything written above is true. But you can use e.g. simple iptables settings: http://ubuntuforums.org/showthread.p...4#post12652474

  8. #18
    Join Date
    May 2013
    Beans
    8

    Re: Firewall?

    Do I just copy and paste into the termimal even though I already set the rules listed below;

    51413/tcp ALLOW Anywhere


    51413/udp DENY Anywhere


    5353/udp DENY Anywhere


    5900/tcp DENY Anywhere


    22 DENY Anywhere


    25/tcp DENY Anywhere


    135,139,445/tcp DENY Anywhere


    137,138/udp DENY Anywhere


    110 DENY Anywhere


    2049 DENY Anywhere


    143 DENY Anywhere

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