DoS Protection Option/Protection Tab

Select the Option/Protection tab to configure options for the DoS Protection policy rule, such as the type of service to which the rule applies, the action to take against packets that match the rule, and whether to trigger log forwarding for matched traffic. You can define a schedule for when the rule is active.
You can also select an aggregate DoS Protection profile and/or a classified DoS Protection profile, which determine the threshold rates that, when exceeded, cause the firewall to take protective actions, such as trigger an alarm, activate an action such as Random Early Drop, and drop packets that exceed the maximum threshold rate.
Field
Description
Service
Click Add and select one or more services to which the DoS Protection policy applies. The default is Any service. For example, if the DoS policy protects web servers, specify HTTP, HTTPS, and any other appropriate service ports for the web applications.
For critical servers, create separate DoS Protection rules to protect the unused service ports to help prevent targeted attacks.
Action
Select the action the firewall performs on packets that match the DoS Protection policy rule:
  • Deny—Drop all packets that match the rule.
  • Allow—Permit all packets that match the rule.
  • Protect—Enforce the protections specified in the specified DoS Protection profile on packets that match the rule. Packets that match the rule are counted toward the threshold rates in the DoS Protection profile, which in turn trigger an alarm, activate another action, and trigger packet drops when the maximum rate is exceeded.
The object of applying DoS Protection is to protect against DoS attacks, so you should use usually Protect. Deny drops legitimate traffic along with DoS traffic and Allow doesn’t stop DoS attacks. Use Deny and Allow only to make exceptions within a group. For example, you can deny the traffic from most of a group but allow a subset of that traffic, or allow the traffic from most of a group but deny a subset of that traffic.
Schedule
Specify the schedule when the DoS Protection policy rule is in effect. The default setting of None indicates no schedule; the policy is always in effect.
Alternatively, select a schedule or create a new schedule to control when the DoS Protection policy rule is in effect. Enter a Name for the schedule. Select Shared to share this schedule with every virtual system on a multiple virtual system firewall. Select a Recurrence of Daily, Weekly, or Non-recurring. Add a Start Time and End Time in hours:minutes, based on a 24-hour clock.
Log Forwarding
If you want to trigger forwarding of threat log entries for matched traffic to an external service, such as to a syslog server or Panorama, select a Log Forwarding profile or click Profile to create a new one.
The firewall logs and forwards only traffic that matches an action in the rule.
For easier management, forward DoS logs separately from other Threat logs, both directly to administrators via email and to a log server.
Aggregate
Aggregate DoS Protection profiles set thresholds that apply to combined group of devices specified in the DoS Protection rule to protect those server groups. For example, an Alarm Rate threshold of 10,000 CPS means that when the total new CPS to the entire group exceeds 10,000 CPS, the firewall triggers an alarm message.
Select an Aggregate DoS Protection profile that specifies the threshold rates at which the incoming connections per second trigger an alarm, activate an action, and exceed a maximum rate. All incoming connections (the aggregate) count toward the thresholds specified in an Aggregate DoS Protection profile.
An Aggregate profile setting of None means there are no threshold settings in place for the aggregate traffic. See Objects > Security Profiles > DoS Protection.
Classified
Classified DoS Protection profiles set thresholds that apply to each individual device specified in the DoS Protection rule to protect individual or small groups of critical servers. For example, an Alarm Rate threshold of 10,000 CPS means that when the total new CPS to any individual server specified in the rule exceeds 10,000 CPS, the firewall triggers an alarm message.
Select this option and specify the following:
  • Profile—Select a Classified DoS Protection profile to apply to this rule.
  • Address—Select whether incoming connections count toward the thresholds in the profile if they match the source-ip-only, destination-ip-only, or src-dest-ip-both.
    The firewall consumes more resources to track src-dest-ip-both counters than to track only the source IP or only the destination IP counters.
If you specify a Classified DoS Protection profile, only the incoming connections that match a source IP address, destination IP address, or source and destination IP address pair count toward the thresholds specified in the profile. For example, you can specify a Classified DoS Protection profile with a Max Rate of 100 cps, and specify an Address setting of source-ip-only in the rule. The result would be a limit of 100 connections per second for that particular source IP address.
Don’t use source-ip-only or src-dest-ip-both for internet-facing zones because the firewall can’t store counters for all possible internet IP addresses. Use destination-ip-only in perimeter zones.
Use destination-ip-only to protect individual critical devices.
Use source-ip-only and the Alarm threshold to monitor suspect hosts in non-internet-facing zones.

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