Game server DDoS playbook: from
first alert to resolution

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Why Game Servers Are the #1 DDoS Target

Game servers are the most frequently targeted infrastructure on the internet. The reasons are straightforward. Game communities are emotionally invested, which makes disruption highly visible and satisfying for attackers. Game server IPs are easy to discover through server browser protocols, DNS records, and in-game network traffic. The attack tools are cheap and accessible: a 10 Gbps UDP flood can be rented for under $20 on booter services. And game servers are uniquely sensitive to latency, meaning even a small-volume attack that adds 50 ms of jitter can ruin the player experience.

The motivation varies. Competitive players DDoS opponents to gain ranking advantages. Disgruntled community members target servers after bans. Rival server operators attack competitors to steal players. And sometimes, it is simply boredom. Regardless of the motive, the result is the same: your players cannot connect, your revenue drops, and your reputation suffers.

This playbook covers the complete lifecycle of a DDoS incident on a game server, from initial detection through mitigation to post-incident recovery. It is designed for operators running dedicated game servers on bare metal or VPS infrastructure, whether that is Minecraft, Rust, ARK, FiveM, CS2, or any other multiplayer title.

Common Attack Vectors Against Game Servers

Understanding the attack vectors helps you configure detection thresholds and mitigation rules correctly. Here are the most common vectors we see targeting game servers:

UDP Floods

The most common attack type. Attackers send massive volumes of UDP packets to the game server port (or random ports) to saturate bandwidth or overwhelm the server's packet processing capacity. Because UDP is connectionless, every packet must be processed by the kernel before it can be discarded. A 5 Gbps UDP flood against a server with a 1 Gbps port results in complete packet loss for legitimate players.

Query Reflection Attacks

Many game servers run query protocols (Source Query, Minecraft Query, Raknet) that respond to unauthenticated UDP packets. Attackers spoof the source IP to a victim's address and send query requests to thousands of game servers simultaneously. The responses are sent to the victim, creating an amplification effect. Flowtriq detects this pattern by monitoring query response rates and flagging abnormal spikes.

TCP SYN Floods

Less common for game servers (since most game protocols use UDP), but relevant for web panels, RCON ports, and login servers that run on TCP. SYN floods exhaust the server's connection table by opening thousands of half-open TCP connections.

Application-Layer Attacks

These target the game protocol itself. For Minecraft servers, this includes join floods (hundreds of bot accounts connecting simultaneously), chat spam that triggers expensive server-side processing, and chunk loading attacks that force the server to generate terrain for fake players. These attacks are lower bandwidth but can crash the server process entirely.

Step 1: Deploy Flowtriq on Your Game Server

Install the Flowtriq agent on each game server (or on the host if you run multiple game instances). The agent analyzes traffic in real-time and reports to the Flowtriq dashboard:

curl -s https://get.flowtriq.com | bash
flowtriq-agent configure --api-key YOUR_API_KEY

The agent runs as a lightweight daemon that captures traffic metadata without inspecting packet payloads. CPU overhead is typically under 1% on modern hardware. It begins learning your server's normal traffic patterns immediately and establishes a baseline within 24 hours.

For game servers, we recommend enabling port-aware detection so Flowtriq distinguishes between traffic to your game port (e.g., 25565 for Minecraft, 27015 for Source) and traffic to other services on the same IP:

# /etc/flowtriq/agent.yml
service_ports:
  - port: 25565
    protocol: udp
    label: "Minecraft"
  - port: 25565
    protocol: tcp
    label: "Minecraft TCP"
  - port: 8123
    protocol: tcp
    label: "Dynmap"

Step 2: Configure Detection Thresholds

Game servers have unique traffic patterns. A popular Minecraft server might see 50,000 packets per second during normal gameplay with 200 concurrent players. A smaller FiveM server might see 10,000 pps with 32 players. Your thresholds need to reflect your server's normal traffic.

We recommend starting with these baseline multipliers:

• Warning: 3x baseline (e.g., if normal is 50,000 pps, warn at 150,000 pps)
• High: 5x baseline (250,000 pps)
• Critical: 10x baseline (500,000 pps)

Flowtriq's adaptive baseline detection handles this automatically after the 24-hour learning period. The manual thresholds above are useful as a starting point while the baseline stabilizes or as hard overrides for known traffic ceilings.

Step 3: Set Up Alert Channels

When an attack is detected, you need to know about it immediately. Configure at least two alert channels:

• Discord: Most game communities use Discord. Set up a private #server-alerts channel for your staff team so they can see attack notifications in real time.
• PagerDuty or email: For critical alerts that need immediate human response, especially during off-hours.

Flowtriq's Slack, Discord, PagerDuty, and email integrations are all included at no extra cost. See our Slack alerts guide for detailed setup instructions (the Discord setup follows the same pattern with webhooks).

Step 4: Build Your Incident Runbook

A runbook is a documented procedure your team follows during an incident. Having this written down before an attack happens eliminates the panic and confusion that leads to bad decisions under pressure. Here is a template runbook for game server DDoS incidents:

Phase 1: Detection (0 to 2 minutes)

1. Receive Flowtriq alert in Discord/Slack with attack details (vector, severity, target IP, pps/bps).
2. Acknowledge the alert. If the severity is high or critical, proceed to Phase 2 immediately.
3. If the severity is warning or info, monitor for 2 minutes to determine if the attack is escalating or transient.

Phase 2: Assessment (2 to 5 minutes)

1. Open the Flowtriq dashboard and review the incident details: attack vector, source distribution, target port.
2. Check player impact: can players connect? Is latency elevated? Are players reporting rubber-banding or disconnects?
3. Determine if the attack targets the game port specifically or the entire IP.

Phase 3: Mitigation (5 to 10 minutes)

1. If Flowtriq has auto-mitigation configured (FlowSpec rules, traffic filtering), verify the rules are active and effective.
2. If the attack exceeds local filtering capacity, escalate to upstream scrubbing (Cloudflare Magic Transit, hosting provider DDoS protection).
3. If the attack targets a specific port that is not your game port, block that port at the firewall.
4. As a last resort, if the attack is massive and all mitigation is exhausted, consider temporarily changing the server IP and updating DNS.

Phase 4: Communication (ongoing)

1. Post a brief status update in your player-facing Discord channel: "We are aware of connectivity issues and are working on it."
2. If you have a status page, update it with the incident status.
3. Do not share technical details publicly (attack size, mitigation method). This gives the attacker feedback.

Phase 5: Resolution and Recovery

1. Once Flowtriq shows the attack has ended (resolved incident), verify player connectivity is restored.
2. Post a follow-up in Discord: "The issue has been resolved. Thank you for your patience."
3. Review the incident in Flowtriq: attack duration, peak volume, mitigation effectiveness, time to resolution.
4. Document lessons learned and update the runbook if needed.

Example Incident Timeline

Here is a real-world example of how this playbook works in practice. This is based on an actual incident handled by a Flowtriq customer running a Minecraft network with 400 concurrent players:

14:02:15  Flowtriq detects UDP flood targeting 203.0.113.10:25565
          Severity: High | 847,000 pps | 3.2 Gbps
          Discord alert sent to #server-alerts

14:02:30  Admin acknowledges alert, opens Flowtriq dashboard
          Source analysis: 12,000 unique source IPs (spoofed)

14:03:00  Flowtriq auto-deploys FlowSpec rate-limit rule via ExaBGP
          Rule: UDP dst 203.0.113.10/32 dst-port 25565 rate-limit 500Mbps

14:03:15  Attack traffic drops from 3.2 Gbps to 500 Mbps at edge router
          Game server recovers, players reconnect

14:03:45  Admin posts in player Discord: "Brief connectivity issue resolved."

14:08:00  Attacker increases volume to 8 Gbps, exceeding local capacity
          Flowtriq auto-triggers Cloudflare Magic Transit diversion

14:08:30  Traffic diverted through Cloudflare scrubbing
          Clean traffic delivered via GRE tunnel
          Player latency increases by 8 ms (acceptable)

14:22:00  Attack stops. Flowtriq waits 120 seconds below threshold.

14:24:00  Flowtriq auto-withdraws Magic Transit diversion
          FlowSpec rule withdrawn
          Normal traffic path restored

14:24:30  Incident resolved in Flowtriq dashboard
          Total duration: 22 minutes
          Player impact: ~60 seconds of connectivity loss

The total player-facing downtime was about 60 seconds. Without automated detection and mitigation, this same attack would have caused 22+ minutes of complete downtime.

Player Retention During Attacks

DDoS attacks do not just cost you server uptime. They cost you players. Every minute of downtime is a player who might not come back. Here are strategies to minimize player loss during incidents:

• Communicate early and often. A simple "We are aware and working on it" in Discord within the first 2 minutes tells players you are on top of it. Silence breeds frustration and speculation.
• Never blame players. Even if a player dispute triggered the attack, publicly blaming someone invites more attacks and creates community drama.
• Keep a status page. Services like Instatus or Statuspage give players a place to check without flooding your Discord with "is the server down?" messages.
• Offer compensation. After a significant outage, consider offering affected players a small in-game reward, extra playtime, or a temporary rank boost. This turns a negative experience into a positive one.
• Reduce time to recovery. The single most impactful thing you can do for retention is minimize downtime. Automated detection and mitigation through Flowtriq reduces time to recovery from 30+ minutes (manual response) to under 2 minutes (automated response).

Game server operators who deploy automated DDoS mitigation see 70% less player churn during attack periods compared to those relying on manual response. The difference is time: players will wait 2 minutes, but they will not wait 30.

Prevention: Reducing Your Attack Surface

While you cannot prevent all DDoS attacks, you can make your servers harder to target:

• Hide your server IP. Use a proxy or tunnel (TCPShield, Cloudflare Spectrum, or a custom GRE tunnel) so players connect to a proxy IP rather than your origin. If the proxy IP gets attacked, you can rotate it without migrating your server.
• Disable unnecessary protocols. Turn off query responses if your server does not need to appear in public server lists. Disable RCON over the public interface.
• Rate-limit connection attempts. Most game servers allow you to configure maximum connections per IP per second. Set this to a reasonable value (3 to 5 per second) to mitigate join floods.
• Use separate IPs for separate services. Run your web panel, voice server, and game server on different IPs. If one gets attacked, the others remain accessible.

Flowtriq protects game servers starting at $9.99/node/month with automated detection, alerting, and mitigation. No bandwidth surcharges, no per-attack fees. Start your free trial and have your game servers protected before the next attack hits.

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