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  1. #1

    flushing iptables and avoiding losing remote access

    Hi I want to know if i run the following iptables script, i wont lose my ssh remote access. Can anyone confirm this is ok?

    PHP Code:
    # iptables example configuration script
    # Flush all current rules from iptables
    iptables -F
    # Allow SSH connections on tcp port 22
    # This is essential when working on remote servers via SSH to prevent locking yourself out of the system
    iptables -A INPUT -p tcp --dport 22 -s MY_HOME_IP_ADDRESS -j  LOG_ACCEPT
    -A OUTPUT -p tcp --sport 22 -d  MY_HOME_IP_ADDRESS -j LOG_ACCEPT
    # Set default policies for INPUT, FORWARD and OUTPUT chains

    iptables -P INPUT DROP
    -P OUTPUT DROP #cant trust users to behave
    # Set access for localhost
    iptables -A INPUT -i lo -j ACCEPT 

  2. #2
    Join Date
    May 2008
    Yes, that should work. In addition to the above script you're using we strongly recommend that you set a cronjob for the root user which has,

    */5 * * * * iptables -F

    This will flush the iptables rules after every 5 minutes so even if you lock out of the server due to a bad iptables rule, the rules will be flushed every 5 minutes and you should be able to gain entry via SSH.

    This is a much better way of deploying iptables and retaining access in case of a mistake and when the server is miles away in a data center.
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