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Thread: about Firewall services

  1. #1
    Join Date
    Mar 2006

    Question about Firewall services

    Dear Expert,

    currently i were using the Ubuntu 8.04 LTS Server Edition. so may i know :-

    1 ) how to find that the firewall service is active.
    2 ) how to find that the port 3306 is block.
    3 ) if the port 3306 is block how to unblock.

    Thank and please advice.

  2. #2
    Join Date
    Dec 2006

    Re: about Firewall services

    1. The "firewall service" (iptables) is always running. If there is a way to turn it besides recompiling the kernel, I don't know it. By default, it will allow everything, so you might consider that disabled.

    2. Use this command from another computer.
    nmap <server ip> -p 3306
    You can also check your current rules
    sudo iptables -L
    A default install that filters nothing will give this output
    Chain INPUT (policy ACCEPT)
    target     prot opt source               destination         
    Chain FORWARD (policy ACCEPT)
    target     prot opt source               destination         
    Chain OUTPUT (policy ACCEPT)
    target     prot opt source               destination
    3. If you want to allow incoming traffic on TCP port 3306
    sudo iptables -I INPUT -p tcp --dport 3306 -j ACCEPT
    If you want to allow everything by clearing all rules
    sudo iptables -P INPUT ACCEPT
    sudo iptables -P OUTPUT ACCEPT
    sudo iptables -P FORWARD ACCEPT
    sudo iptables -t nat -P PREROUTING ACCEPT
    sudo iptables -t nat -P POSTROUTING ACCEPT
    sudo iptables -t nat -P OUTPUT ACCEPT
    sudo iptables -F
    sudo iptables -t nat -F
    These changes will not be persistent if you have a service that loads pre-configured rules at boot time.


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