Sophos Firewall DoS Protection Overview

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Questions and Answers

What is the primary purpose of configuring DoS policies?

  • To establish firewall rules for IPv6
  • To configure rate limits for different attack types (correct)
  • To prioritize traffic based on type
  • To monitor network bandwidth usage

What must be specified when configuring each attack type in a DoS policy?

  • The duration of the attack
  • The IP addresses of potential attackers
  • The packets per second limit and its scope (correct)
  • The protocol type being used

Which of the following statements regarding DoS rules is true?

  • DoS rules are only effective against SYN flood attacks
  • A single DoS policy can be referenced in multiple DoS rules (correct)
  • DoS rules can be applied to both IPv4 and IPv6 traffic
  • The order of DoS rules does not affect how they are evaluated

What is the significance of the rule position in DoS rules?

<p>It affects the evaluation order of the rules (B)</p> Signup and view all the answers

Which section of the DoS rule configuration specifies the type of traffic to apply the policy to?

<p>Options section (B)</p> Signup and view all the answers

What does DoS protection primarily aim to achieve when configured on the Sophos Firewall?

<p>Blocking denial-of-service attacks (C)</p> Signup and view all the answers

When DoS protection is enabled on the Sophos Firewall, how is it applied to traffic?

<p>To all traffic regardless of its source or destination (A)</p> Signup and view all the answers

What potential issue may arise when using strict DoS protection rules?

<p>False positives affecting legitimate outgoing traffic (D)</p> Signup and view all the answers

What is recommended when configuring DoS rules on the Sophos Firewall for best outcomes?

<p>Targeting specific traffic to optimize protection (D)</p> Signup and view all the answers

What is a common misconception about the behavior of DoS protection on the Sophos Firewall?

<p>It can only protect against incoming threats (C)</p> Signup and view all the answers

What is the purpose of configuring Advanced DoS protection rules?

<p>To manage different traffic types with tailored rules (B)</p> Signup and view all the answers

Which command syntax is correctly used to create a DoS policy?

<p>system dos-config add dos-policy policy-name [SYN-Flood pps] (A)</p> Signup and view all the answers

What is a key feature of the traffic tracking methods for DoS protection?

<p>Traffic from each source IP and to each destination IP can be tracked separately (B)</p> Signup and view all the answers

In Advanced DoS protection, what aspect can be refined for targeted configuration?

<p>Specific protocols and port numbers of the traffic (D)</p> Signup and view all the answers

What is required to configure Advanced DoS protection for Sophos Firewall?

<p>Console access to execute configuration commands (C)</p> Signup and view all the answers

Flashcards

DoS Protection

A security feature that protects network resources from denial of service attacks by filtering out malicious traffic.

Denial of Service (DoS) Attack

A type of attack that aims to make a service unavailable to legitimate users by overwhelming it with requests.

False Positive

A situation where a network security rule mistakenly blocks legitimate traffic due to its strictness.

Bidirectional Traffic

Traffic that originates from the same network and travels in both directions.

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Targeted DoS Rules

The ability to configure DoS rules specifically for certain traffic, providing more granular protection.

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Advanced DoS Protection

A feature in Sophos Firewall that allows you to configure more specific rules for DoS protection.

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DoS Policy

A set of limits that are applied to specific attack types. For example, you can limit the number of SYN packets per second (pps) for a SYN flood attack.

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DoS Policy Types

Types of DoS policies: "per-src": Each source IP is tracked separately. "per-dst" :Each destination IP is tracked separately. "global": All traffic is considered together.

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Configuring DoS Policies

A way to configure policies that define the limits for each attack type. For example, you could set a limit for SYN flood attacks, UDP flood attacks, ICMP flood attacks, or IP flood attacks.

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DoS Rules

A set of rules that define which traffic the DoS policy is applied to.

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DoS Rule

Used to configure the traffic that a DoS policy is applied to. This rule specifies the source, destination, protocols, and ports to which the DoS policy should be applied.

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Packets per Second Limit

The rate limit that a DoS policy applies to a specific attack type, controlling the number of packets per second allowed.

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Per Source, Per Destination, Global

A setting in a DoS policy that determines whether packets per second limits are applied to individual sources, destinations, or globally.

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Rule Position

Specifies the order in which DoS rules are evaluated. Rules higher up in the list are evaluated before those lower down.

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Study Notes

Sophos Firewall DoS Protection

  • Sophos Firewall DoS protection is configured globally for all traffic when enabled in the WebAdmin
  • Advanced DoS protection consists of DoS policies and DoS rules
  • DoS policies set limits for each attack type (e.g., SYN flood, UDP flood, ICMP flood, IP flood)
  • DoS rules specify which traffic the DoS policy applies to
  • Advanced DoS configuration requires using packets per second (PPS) calculations
  • PPS calculations need software details like concurrent connections, protocol, transaction size, and frequency

Additional Information

  • Copyright: 2022 Sophos Limited. All rights reserved.
  • No unauthorized reproduction allowed without prior written consent.
  • Sophos and the Sophos logo are registered trademarks of Sophos Limited
  • Other names, logos, and marks in the document might belong to other trademark holders

DoS Protection Configuration

  • DoS protection is enabled/configured in the WebAdmin
  • Applies to all traffic irrespective of source or destination
  • While providing maximum protection, it can cause false positives in complex networks due to bidirectional traffic (outgoing traffic may be blocked)
  • Advanced configuration allows targeting specific protocols, ports, zones, interfaces, networks ensuring relevant traffic is safe

DoS Policies

  • Configure limits for each attack type
  • Examples: SYN flood, UDP flood, ICMP flood, IP flood
  • Each attack type's limit is configurable: packets per second (pps) with options per-source, per-destination, or global

DoS Rules

  • Configure which traffic to apply the DoS policy to
  • Available only for IPv4 addressing
  • Rules are evaluated from top to bottom
  • Configured via command-line interface or GUI
  • Allows selecting traffic and parameters like source IP/zone/interface, destination IP/zone/interface, protocol, and ports.
  • Only one DoS policy can be assigned to a DoS rule

Example Scenarios

  • VoIP service, game servers: require separate rules due to different traffic flow direction and protection needs (inbound and outbound).
  • Protection of specific network zones, interfaces, and protocols, using rules for inbound/outbound traffic
  • Example policy: "UDP-GameServers" policy to protect 10000 PPS per-source UDP-flood

PPS Calculation

  • Needed for advanced DoS policy configuration
  • Factors include max transactions/second, packet size, concurrent connections, and transaction frequency
  • Detailed calculation example in supplemental material
  • Use calculated PPS values in DoS policy creation

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