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Denial of service attacks prevents legitimate users from using a service. One particular type of this attack is known as SYN flood, where external hosts attempt to overwhelm the server machine by sending a constant stream of TCP connection request. There are several approaches for dealing with this attack that firewall is one of them. In this paper, the authors attempt to prevent this type of attacks with iptables firewalls. Any Firewall prevents unauthorized use and access to one device, its job is to carefully analyze data entering and exiting the device based on user configurations and ignore information that comes from suspicious locations.
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