eggs/game_eggs/steamcmd_servers/hlds_server/rehlds/README.md

HLDS Servers

This is for older games like CS 1.6 (default game) and other servers that still run on the older HLDS server under id 90

ReHLDS

ReHLDS is a reverse engineered build of the original HLDS (build 6152/6153), and provides a number of fixes and improvements over the vanilla engine files, while remaining compatible with vanilla clients.

Github: https://github.com/dreamstalker/rehlds

Server Ports

HLDS servers require up to 6 ports

Port	default
Game/rcon	27015
HLTV	27020
VAC	26900