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The attacker with the IP 1.1.1.1 sends a packet with a spoofed source IP (3.3.3.3) to the destination 2.2.2.2. (This might already be a security risk, e.g. if 2.2.2.2 always trusts all packets from 3.3.3.3.) 2.2.2.2 now answers the alleged sender 3.3.3.3, which in reality never sent the packet. 3.3.3.3 therefore is receiving an unexpected ...
The proliferation of large botnets 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.
A backdoor is a typically covert method of bypassing normal authentication or encryption in a computer, product, embedded device (e.g. a home router), or its embodiment (e.g. part of a cryptosystem, algorithm, chipset, or even a "homunculus computer"—a tiny computer-within-a-computer such as that found in Intel's AMT technology).
A Smurf attack is a distributed denial-of-service attack in which large numbers of Internet Control Message Protocol (ICMP) packets with the intended victim's spoofed source IP are broadcast to a computer network using an IP broadcast address. [1] Most devices on a network will, by default, respond to this by sending a reply to the source IP ...
In computer networking, ingress filtering is a technique used to ensure that incoming packets are actually from the networks from which they claim to originate. This can be used as a countermeasure against various spoofing attacks where the attacker's packets contain fake IP addresses.
A SYN flood attack works by not responding to the server with the expected ACK code. The malicious client can either simply not send the expected ACK, or by spoofing the source IP address in the SYN, cause the server to send the SYN-ACK to a falsified IP address – which will not send an ACK because it "knows" that it never sent a SYN.
IP addresses in the bogon space may cease to be bogons because IANA frequently assigns new address. Announcements of new assignments are often published on network operators' mailing lists (such as NANOG ) to ensure that bogon filtering can be removed for addresses that have become legitimate.
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