202:, where the objective is to flood the target with an overwhelming volume of traffic, and the attacker does not care about receiving responses to the attack packets. Packets with spoofed IP addresses are more difficult to filter since each spoofed packet appears to come from a different address, and they hide the true source of the attack. Denial of service attacks that use spoofing typically randomly choose addresses from the entire IP address space, though more sophisticated spoofing mechanisms might avoid non-routable addresses or unused portions of the IP address space. The proliferation of large
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387:(TCP) uses sequence numbers negotiated with the remote machine to ensure that arriving packets are part of an established connection. Since the attacker normally cannot see any reply packets, the sequence number must be guessed in order to hijack the connection. The poor implementation in many older operating systems and network devices, however, means that TCP sequence numbers can be predicted.
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The use of packets with a false source IP address is not always evidence of malicious intent. For example, in performance testing of websites, hundreds or even thousands of "vusers" (virtual users) may be created, each executing a test script against the website under test, in order to simulate what
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IP spoofing is also used in some server-side load balancing. It lets the load balancer spray incoming traffic, but not need to be in the return path from the servers to the client. This saves a networking hop through switches and the load balancer as well as outbound message processing load on the
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makes spoofing less important in denial of service attacks, but attackers typically have spoofing available as a tool, if they want to use it, so defenses against denial-of-service attacks that rely on the validity of the source IP address in attack packets might have trouble with spoofed packets.
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In DDoS attacks, the attacker may decide to spoof the IP source address to randomly generated addresses, so the victim machine cannot distinguish between the spoofed packets and legitimate packets. The replies would then be sent to random addresses that do not end up anywhere in particular. Such
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based on IP addresses. This type of attack is most effective where trust relationships exist between machines. For example, it is common on some corporate networks to have internal systems trust each other, so that users can log in without a username or password provided they are connecting from
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which contains (among other things) the IP address of the sender of the packet. The source IP address is normally the address that the packet was sent from, but the sender's address in the header can be altered, so that to the recipient it appears that the packet came from another source.
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The source IP address provides only limited information about the sender. It may provide general information on the region, city and town when on the packet was sent. It does not provide information on the identity of the sender or the computer being used.
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on outgoing packets, which is blocking of packets from inside the network with a source address that is not inside. This prevents an attacker within the network performing filtering from launching IP spoofing attacks against external machines. An
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another machine on the internal network – which would require them already being logged in. By spoofing a connection from a trusted machine, an attacker on the same network may be able to access the target machine without authentication.
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The protocol requires the receiving computer to send back a response to the source IP address therefore spoofing is mainly used when the sender can anticipate the network response or does not care about the response.
368:(IDS) is a common use of packet filtering, which has been used to secure the environments for sharing data over network and host-based IDS approaches.
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headers. Falsified headers are used to mislead the recipient, or network applications, as to the origin of a message. This is a common technique of
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IP address spoofing involving the use of a trusted IP address can be used by network intruders to overcome network security measures, such as
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It is also recommended to design network protocols and services so that they do not rely on the source IP address for authentication.
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monitoring backscatter to measure the statistical intensity of DDoS attacks on the internet over time.
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Since each user will normally have its own IP address, commercial testing products (such as
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will happen when the system goes "live" and a large number of users log in simultaneously.
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load balancer. Output usually has more packets and bytes, so the savings are significant.
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The basic protocol for sending data over the
Internet network and many other
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569:"Network Dispatcher: A Connection Router for Scalable Internet Services"
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Veeraraghavan, Prakash; Hanna, Dalal; Pardede, Eric (2020-09-14).
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have their own defense against IP spoofing attacks. For example,
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Configuration and services that are vulnerable to IP spoofing:
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169:(IP). The protocol specifies that each IP packet must have a
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ANA Spoofer
Project: State of IP Spoofing and Client Test
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305:Learn how and when to remove this message
109:Learn how and when to remove this message
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125:Example scenario of IP address spoofing
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643:Types of cyberattacks
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58:"IP address spoofing"
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149:with a false source
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484:. Symantec
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157:Background
151:IP address
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633:Deception
610:RFC
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425:See also
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