DHCP Steering for IoT Traffic Policy Enforcement

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Solution Overview

Problem

IoT devices present a significant security challenge due to their minimal built-in security features, lack of updates, and difficulty in network segmentation, making them easy targets for cyberattacks and difficult to enforce security policies effectively.

Innovation Solution

An inline secure forwarder intercepts outbound network traffic from IoT devices before NAT, extracts pre-NAT metadata, and reroutes it to a policy enforcement point for deep inspection and enforcement, using DHCP relay-based steering to configure devices to send traffic to this forwarder instead of the default gateway.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If IoT devices use minimal built-in security features to reduce device complexity and cost, then device complexity is reduced, but security reliability deteriorates

Engineering Contradiction:

Improvedevice complexityVSAvoidsecurity reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent introduces a network intermediary (inline secure forwarder or DHCP relay) that acts as a mediator between IoT devices and the network. This intermediary captures pre-NAT metadata from devices, steers traffic to policy enforcement points, and enables security policies to be applied without modifying the IoT devices themselves, thus maintaining low device complexity while improving security reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent segments the network security function from the IoT devices by introducing separate components: metadata capture at the network level, DHCP relay for steering, and policy enforcement points. This segmentation allows security functionality to be added at the network layer without increasing device complexity, resolving the contradiction between simple devices and reliable security

Inventive Principle:

Principle #1Segmentation

2Device complexity

If IoT devices lack update mechanisms to reduce device complexity, then device complexity is reduced, but security reliability deteriorates due to vulnerability to attacks

Engineering Contradiction:

Improvedevice complexityVSAvoidsecurity reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The network intermediary captures pre-NAT metadata and steers traffic through policy enforcement points that can detect vulnerabilities and block attacks in real-time. This provides continuous security protection without requiring update mechanisms in the IoT devices themselves, maintaining low device complexity while improving security reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system performs preliminary security enforcement by capturing metadata before NAT and steering traffic through policy enforcement points that can pre-validate and block malicious traffic. This preliminary action provides security protection without requiring post-deployment updates to the IoT devices

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If network segmentation is difficult to implement for IoT devices to reduce device complexity, then device complexity is reduced, but security reliability deteriorates

Engineering Contradiction:

Improvedevice complexityVSAvoidsecurity reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent replaces the mechanical approach of physical or VLAN-based network segmentation with a software-based DHCP relay system that uses pre-NAT metadata to steer traffic. This substitution allows logical segmentation and policy enforcement without requiring complex network configuration or device modifications, maintaining low device complexity while improving security reliability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The DHCP relay acts as an intermediary that captures pre-NAT metadata and steers traffic to appropriate policy enforcement points based on device identity. This intermediary enables logical network segmentation and targeted security policies without requiring physical segmentation or complex device configuration

Inventive Principle:

Principle #24Intermediary (Mediator)

4Reliability

If DHCP relay-based steering is implemented to route traffic through policy enforcement points, then security enforcement capability is improved, but network complexity increases

Engineering Contradiction:

Improvesecurity enforcement capabilityVSAvoidnetwork complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The DHCP relay is configured to serve multiple functions: capturing pre-NAT metadata, steering traffic to policy enforcement points, and enabling device identification. By making the DHCP relay multi-functional, the patent improves security enforcement capability without adding separate dedicated components, thus limiting the increase in network complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260075095A1Configuring special purpose devices to route network traffic for policy enforcement using classification and DHCP steering logic

Publication Date: 2026.03.12 NETSKOPE INC

AI summary

The technology disclosed relates to configuring IoT devices for policy enforcement. In particular, the technology disclosed relates to configuring a plurality of special-purpose devices on a network segment of a network to steer outbound network traffic to an inline secure forwarder on the network segment instead of a default gateway on the network segment. The inline secure forwarder is configured to route the outbound network traffic to a policy enforcement point for a policy enforcement.