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Modernizing the Classic Engine


While original Steam servers are the standard, many legacy communities rely on ReHLDS (a reverse-engineered engine) and Reunion (the successor to Dproto) to provide enhanced security and cross-client compatibility.
Reading TimeDifficultyLast Updated
6 minutesAdvancedJanuary 2026

The Benefits of ReHLDS

ReHLDS replaces the stock Valve swds.dll or engine_i486.so with an optimized version that fixes decades of security vulnerabilities and improves multi-core CPU utilization.
  • We highly recommend running ReHLDS for any public CS 1.6 server.

Installing Reunion

Reunion allows players from multiple client versions to connect to your server simultaneously.
  1. Place the mod folder into /addons/reunion/.
  2. Open your Metamod configuration (plugins.ini) and add the path to the Reunion library.
  3. Configuration: Modify reunion.cfg to define how the server assigns SteamIDs to different client types.

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Last Updated: January 2026 | Engine: Performance and stability.