Requirements

The firewall blocks threats based on the Indicators of Compromise (IoCs) in threat feeds, such as IP addresses, domains, and URLs.

You must configure settings and rules based on the IoC type, traffic type, and protocol used.

Configuration requirements

For Active threat response to identify and take action on all the IoCs, make sure the following configurations are in place:

1. Firewall rule: Configure a rule allowing internal to WAN traffic.

2. Intrusion prevention: Specify at least one of the following settings.

   1. Application classification must be turned on. It's turned on by default. See application_classification.
   2. Select an intrusion prevention policy in the firewall rule.

   Note

   The firewall needs IPS-related settings for the following traffic:

   • HTTPS traffic
   • DNS requests to servers other than the firewall over HTTP and HTTPS

3. Decryption: Specify the decryption settings and rules for URLs over HTTPS to get the full URL path.

   Note

   To know the full URL, the firewall must decrypt traffic. The Server Name Indication (SNI) header only contains the domain name.

   • If you use Web proxy, do as follows:

     1. Go to Web filtering in the firewall rule and select the following settings:

        1. Use web proxy instead of DPI engine
        2. Decrypt HTTPS during web proxy filtering

        

   • If you use DPI mode, do as follows:

     1. Go to Web filtering in the firewall rule and clear Use web proxy instead of DPI engine.
     2. Go to Rules and policies > SSL/TLS inspection rules, click Add, and create a rule with Action set to Decrypt for internal to WAN traffic. See Add an SSL/TLS inspection rule.

Requirements at-a-glance

To take action on IoCs, the firewall needs some basic configurations. If an IoC isn't blocked, see the troubleshooting steps.

flowchart TD;
A(IoC types)
B(IP addresses)
C(Domains)
D(URLs)
E(Firewall rule)
F(1. Firewall rule</br>2. Application classification: On</br>&nbsp;&nbsp;&nbsp;&nbsp;or IPS policy in firewall rule)
G(1. Firewall rule</br>2. Application classification: On</br>&nbsp;&nbsp;&nbsp;&nbsp;or IPS policy in firewall rule</br>3. Web proxy, decryption settings in firewall rule</br>&nbsp;&nbsp;&nbsp;&nbsp;or DPI setting in firewall rule and</br>&nbsp;&nbsp;&nbsp;&nbsp; SSL/TLS inspection rule)
H(Check threat exclusions)
I(1. Check threat exclusions</br>2. Check web exclusions</br>&nbsp;&nbsp;&nbsp;&nbsp;or SSL/TLS exclusion lists)
    A==>B;
    A==>C;
    A==>D;
    B == Configuration ==> E == Troubleshooting ==> H
    style E text-align:left
    style H text-align:left
    C == Configuration ==> F == Troubleshooting ==> I
    style F text-align:left
    D == Configuration ==> G == Troubleshooting ==> I
    style G text-align:left
    style I text-align:left

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