Enforce Policy on an External Dynamic List
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Enforce Policy on an External Dynamic List
Learn how to block or allow traffic based on IP addresses
or URLs in an external dynamic list, or use a dynamic domain list
with a DNS sinkhole to prevent access to malicious domains.
Block or allow traffic based on IP addresses
or URLs in an external dynamic list, or use a dynamic domain list
with a DNS sinkhole to prevent access to malicious domains.
Tips for enforcing policy on the firewall with
external dynamic lists:
- When viewing external dynamic lists on the firewall (), clickObjectsExternal Dynamic ListsList Capacitiesto compare how many IP addresses, domains, and URLs are currently used in policy with the total number of entries the firewall supports for each list type.
- Use Global Find to search the firewall or Panorama management server for a domain, IP address, or URL that belongs to one or more external dynamic lists used in policy. This is useful for determining which external dynamic list (referenced in a Security policy rule) is causing the firewall to block or allow a certain domain, IP address, or URL.
- Use the directional controls at the bottom of the page to change the evaluation order of external dynamic lists. This allows you to or order the lists to make sure the most important entries in an external dynamic list are committed before capacity limits are reached.You can only change the order of the lists whenGroup By Typeis deselected.
- Use an external dynamic list of URL type as match criteria in a Security policy rule.
- Select.PoliciesSecurity
- ClickAdd, and enter a descriptiveNamefor the rule.
- In theSourcetab, select aSource Zone.
- In theDestinationtab, select aDestination Zone.
- In theService/URL Categorytab, clickAddto select an external dynamic list for use asURL Categorymatch criteria.
- In theActionstab, set Action Setting toAlloworDeny.
- ClickOK, andCommityour changes.
- Verify whether entries in the external dynamic list were ignored or skipped.Use the following CLI command on a firewall to review the details for a list.request system external-list show type<domain|ip|url> name_of_listFor example:request system external-list show type url EBL_ISAC_Alert_List
- Test that the policy action is enforced.
- View external dynamic list entries and attempt to access a URL from the list.
- Verify that the action you defined is enforced.
- To monitor the activity on the firewall:
- SelectACC, and add a URL Domain as a global filter to view the Network Activity and Blocked Activity for the URL you accessed.
- Selectto access the detailed log view.MonitorLogsURL Filtering
- Use an external dynamic list of IP address type as a Source or Destination Address Object in a Security policy rule.This capability is useful if you deploy new servers and want to allow access to the newly deployed servers without requiring a firewall commit.
- Select.PoliciesSecurity
- ClickAdd, and enter a descriptiveNamefor the rule.
- In theSourceandDestinationtabs, select an external dynamic list forSource AddressandDestination Address.
- In theService/URL Categorytab, setServicetoapplication-default.
- In the Actions tab, set Action Setting toAlloworDeny.Create separate external dynamic lists to specify allow and deny actions for specific IP addresses.
- Leave all the other options at the default values.
- ClickOK, andCommityour changes.
- Test that the policy action is enforced.
- View external dynamic list entries and attempt to access an IP address from the list.
- Verify that the defined action is enforced.
- Selectand view the log entry for the session.MonitorLogsTraffic
- To verify the policy rule that matches a flow, select, and execute a Security Policy Match test:DeviceTroubleshooting
- Use a predefined URL external dynamic list to exclude benign domains that applications use for background traffic from Authentication policy.When you select thepanw-auth-portal-exclude-listexternal dynamic list type, you can easily exclude from Authentication policy enforcement the domains that many applications use for background traffic, such as updates and other trusted services. This ensures that the firewall does not block the necessary traffic for these services and that application maintenance is not interrupted.
- Select.PoliciesAuthentication
- In theService/URL Categorytab, select the predefined URL external dynamic list as theURL Category.
- In theActionstab, selectdefault-no-captive-portalas theAuthentication Enforcement.
- ClickOK.
- Movethe rule to the top so that it's the first rule in the policy.
- Commityour changes.