SynFlood

Start a SYN flood attack to an ip address.

Requirements

• Zig

• libnet

  • libnet1-dev under Debian: apt-get install libnet1-dev
  • libnet under macOS: brew install -s libnet

• Root access for sending a packet.

• Its recommended to block all RST packets from the source host on the source host.

   iptables -I OUTPUT -p tcp --dport 80 --tcp-flags RST RST -j DROP
   iptables -I OUTPUT -p tcp --dport 80 --tcp-flags RST ACK -j DROP

Download

Download the latest binaries from version 3.

Build

1. Clone:

   git clone https://github.com/TheFox/synflood.git

2. In synflood directory, make:

   zig build

   Binary file is available as zig-out/bin/synflood.

3. Done.

Usage

synflood [-h|--help] -s <IP> -d <IP> -p <PORT> -c <NUM>

• -s: Source IP address.
• -d: Destination IP address.
• -p: Destination port.
• -c: Number of connections.

Examples:

./synflood -s 192.168.241.31 -d 192.168.1.3 -p 80
./synflood -s 192.168.241.31 -d 192.168.1.3 -p 80 -c 1000

Debug

sudo tcpdump -ni en0 'tcp and host <IP>'