The first rule that matches the type of traffic will be used. Since each rule in a chain followed in order, it's important that the rules are setup in proper order. You can manage firewall rules in each chain by using the commands to append, insert or remove rules. RedHat/CentOS servers tend to DENY all traffic in each chain by default. Debian/Ubuntu servers tend to come with all chains open to all traffic - set to ACCEPT. You can define a default behaviour for each chain - either to ACCEPT all traffic, or DENY all traffic. ![]() ![]()
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