End-of-Life (EoL)

Monitor Data Center Block Rules and Tune the Rulebase

Monitor traffic that you explicitly block so that you can investigate potential attacks and evaluate whether you should allow any of the blocked traffic.
Developing a best practice security policy is an iterative process. As soon as you Create Data Center Traffic Block Rules, start monitoring traffic that matches the block rules designed to identify policy gaps, unexpected behaviors, and potential attacks. Tune your application allow rules to account for traffic that matches the block rules but should be allowed and investigate traffic that may indicate an attack.
Reports on blocked traffic contain valuable information you can use to investigate potential issues. Keep the block rules in the rulebase to protect your valuable data center assets and provide that information when traffic matches a block rule.
Follow content update best practices to keep your firewall protection up-to-date. Maintain the Data Center Best Practice Rulebase includes specific best practices for data center firewalls.
  1. Create custom reports to monitor traffic that matches the block rules designed to identify policy gaps and potential attacks.
    1. Select
      Manage Custom Reports
    2. Add
      a report and give it a
      that describes the report’s purpose, in this example
      DC Best Practice Policy Tuning
    3. Set the
      Traffic Summary
      . This also changes the
      Available Columns
    4. From
      Available Columns
      , add
      Source Zone
      Destination Zone
      Risk of App
      , and
      to the
      Selected Columns
      list. If there are other types of information you want to monitor, select those as well.
    5. Select the
    6. Set the desired
      Time Frame
      Sort By
      , and
      Group By
      values. In this example we set the
      Time Frame
      Last 7 Days
      , the
      Sort By
      , and the
      Group By
      App Sub Category
    7. Define the query to match traffic hitting the rules designed to find policy gaps and potential attacks. You can create a single report for traffic that matches any of the rules using the
      operator, or create individual reports to monitor each rule. In the
      Query Builder
      , specify the name of each rule you want to include in the report. This example uses the six blocking rules and uses the
      operator to include information about traffic that matches any of the rules:
      • (rule eq ‘Discover-Unknown-Users’)
      • (rule eq ‘Block-Bad-Apps’)
      • (rule eq ‘Unexpected-App-from-User-Zone’)
      • (rule eq ‘Unexpected-App-from-Any-Zone’)
      • (rule eq ‘Unexpected-User-App-Any-Port’)
      • (rule eq ‘Unexpected-App-Any-Port’)
  2. Review the report (or reports) regularly to make sure you understand why traffic matches each block rule and either update policy to include legitimate applications and users, or use the information to assess the risk of traffic that matches the rules.

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