Permit Compatibility between Umbrella Roaming Client and DNSMasq

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Updated:October 31, 2025
Document ID:225353

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    Introduction

    This document describes the compatibility considerations between Umbrella Roaming Client and DNSMasq.

    Overview

    Umbrella Roaming Client and DNSMasq both use port 53 for DNS and compete for the same resources. These two services are incompatible with each other.

    Compatibility Details

    Umbrella Roaming Client functions as a DNS proxy server, listening on 127.0.0.1 (localhost) port 53. Any other service, such as DNSMasq, that attempts to listen on the same port creates a conflict. Running both services on the same system is not supported.

    • Only one service can operate on port 53 at a time.
    • If both DNSMasq and Umbrella Roaming Client are installed, only one can function, usually whichever service starts first.

    Recommended Action

    You must choose to use either the Umbrella Roaming Client or DNSMasq, but not both, to avoid DNS conflicts on port 53.

    Revision History

    Revision Publish Date Comments
    1.0
    31-Oct-2025
    Initial Release
    TAC Authored

    Contributed by Cisco Engineers

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