What Should You Allow and What Should You Block?
The most commonly asked question when installing a firewall is, “What should be allowed and what should be blocked?” This question assumes a distinct and definitive answer. The answer, however, is subjective and variable. A single security stance or filtering configuration that works for every situation, every organization, and every system doesn’t exist. Network security managers must investigate the needs and threats to the business and make informed decisions about what traffic to allow and what traffic to block.
The first stage in making this determination is to perform a complete inventory of all needed or desired communications. This should include every transaction between internal systems, ...
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