NoDDoS v6.2.9 Technical Overview<\/p>\n
NoDDoS is a lightweight security utility for Minecraft 1.21+ designed to mitigate packet-based exploits and automated bot joins. The system uses an Atomic Sliding Window algorithm to monitor incoming traffic per-player, ensuring that rate limits cannot be bypassed by timing packets at the end of a second. It operates with high concurrency safety using ConcurrentHashMap and Atomic variables to maintain server stability during high-load events.<\/p>\n
Core Functionality:<\/p>\n
Packet Filtering: Specifically monitors CUSTOM_PAYLOAD, CHAT, and WINDOW_CLICK packet types.
\nJoin Rate Limiting: Implements a two-tier threshold (Normal and Burst) to distinguish between server restarts and bot attacks.
\nProgressive Punishment: Increases ban duration based on the frequency of violations from a specific IP address.
\nResource Efficiency: Uses asynchronous cleanup tasks and single-kick scheduling to minimize main-thread impact.<\/p>\n
Configuration (config.yml):<\/p>\n
“`
\nsettings:
\n # Maximum allowed player joins per second under normal conditions
\n joins-per-second: 5<\/p>\n
# Burst join limit – Reaching this triggers the progressive ban system
\n burst-limit: 15<\/p>\n
# Maximum simultaneous connections allowed from a single IP address
\n max-connections-per-ip: 2<\/p>\n
# Maximum packets (Chat, Click, Payload) allowed per second per player
\n max-packets-per-second: 300<\/p>\n
messages:
\n prefix: “&8[&6NoDDoS&8] ”<\/p>\n
# Message when the normal join limit is reached
\n global-cooldown: “&cThe server is currently busy! Please wait a few seconds and try again.”<\/p>\n
# Message when an IP exceeds the connection limit
\n ip-limit: “&cToo many connections from this IP. Please logout from your other accounts.”<\/p>\n
# Kick message for packet flooding
\n packet-spam: “&cSuspicious packet traffic detected! Connection closed for security.”<\/p>\n
# Message for players currently blocked by the progressive ban system
\n blacklisted: “&cYour IP has been temporarily blocked due to suspicious activity. Please wait.”<\/p>\n
# Message sent to admins after reloading the plugin
\n reload: “&aConfiguration reloaded and violation records cleared!”
\n“`<\/p>\n
Technical Requirements:<\/p>\n
Java 21 and Java 25
\nProtocolLib dependency required for packet interception.<\/p>\n","protected":false},"excerpt":{"rendered":"
High-performance 1.21+ Anti-Bot and Packet Limiter using Atomic Sliding Window for maximum CPU efficiency and seciyi.<\/p>\n","protected":false},"featured_media":112964,"template":"","meta":{"_minecraft_slug":"noddos","_minecraft_project_id":"WFdyxPYH","_minecraft_author":"VoidAdam","_minecraft_license":"LicenseRef-All-Rights-Reserved","_minecraft_downloads":22,"_minecraft_follows":2,"_minecraft_client_side":"unsupported","_minecraft_server_side":"required","_minecraft_storage_type":"zip","_minecraft_archive_name":"noddos.zip","_minecraft_size_bytes":9797,"_minecraft_version_count":1,"_minecraft_updated_at":"2026-05-15T22:34:44.975224Z","_minecraft_date_created":"2026-04-11T04:04:37.905220Z","_minecraft_date_modified":"2026-04-04T14:02:33.375471Z","_minecraft_project_url":"https:\/\/modrinth.com\/mod\/noddos","_minecraft_icon_attachment_id":112964,"_minecraft_imported_at":"2026-06-06T15:33:50+00:00","_minecraft_import_hash":"d082b37305c26522928f3844e0e33320","_minecraft_versions":"","_minecraft_links":"","_minecraft_gallery":"","_minecraft_api_metadata":""},"mod_category":[124,126,90,127,128,129,123,92],"mod_loader":[130,132,133,134],"minecraft_version":[62,37,40,41,73,74,38,78,79,80,81,82],"class_list":["post-112963","mod","type-mod","status-publish","has-post-thumbnail","hentry","mod_category-bukkit","mod_category-management","mod_category-optimization","mod_category-paper","mod_category-purpur","mod_category-spigot","mod_category-technology","mod_category-utility","mod_loader-bukkit","mod_loader-paper","mod_loader-purpur","mod_loader-spigot","minecraft_version-1-21","minecraft_version-1-21-1","minecraft_version-1-21-10","minecraft_version-1-21-11","minecraft_version-1-21-2","minecraft_version-1-21-3","minecraft_version-1-21-4","minecraft_version-1-21-5","minecraft_version-1-21-6","minecraft_version-1-21-7","minecraft_version-1-21-8","minecraft_version-1-21-9"],"yoast_head":"\n