Set maximum UDP PacketsPerSecond for GamePlay (eg. cvar unlocker or mem edit) [via FIREWALL (IPTABLES)] for LINUX

The issue:
Video1 - w Netstatus
Video2 - w Lagometer

Not only memory editing but also cvar unlocked clients can have higher packet-settings than 100 - which equals cheating

 

Solving the problem:

Strictly limit the average rate of incoming UDP packets to 100 packets per second without allowing any burst beyond this rate, you can adjust the iptables rule accordingly. Here's how you can set it up:

sudo iptables -A INPUT -p udp --dport 12345 -m limit --limit 100/second -j ACCEPT

Explanation:

• -A INPUT: Appends a rule to the INPUT chain.
• -p udp: Specifies that this rule applies to UDP packets.
• --dport 12345: Filters packets based on destination port 12345.
• -m limit: Uses the limit module to control the rate of incoming packets.
• --limit 100/second: Sets the maximum average rate to 100 packets per second.
• -j ACCEPT: Specifies that packets matching the criteria (port 12345, UDP, within rate limits) should be accepted.
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How It Works:

This rule strictly limits the incoming UDP packets on port 12345 to an average rate of 100 packets per second. It does not allow any burst beyond this rate; hence, it ensures that the traffic conforms to a steady flow of up to 100 packets per second.

Additional Steps:

1. View Current iptables Rules:

   To verify the current iptables rules, use:

   sudo iptables -L -v -n --line-numbers

   
    

2. Save the iptables Rules:

   To ensure the rules persist after a reboot, save the rules:

   • Debian/Ubuntu:
      

     sudo netfilter-persistent save

      

   • Red Hat/CentOS:

     sudo service iptables save

     
     
      

This iptables rule effectively limits incoming UDP packets on port 12345 to a strict average rate of 100 packets per second, ensuring a controlled and consistent flow of network traffic without allowing any burst beyond this rate. Adjust the port number (--dport) and rate limits (--limit) as needed for your specific network requirements.