![]() ![]() It lets the load balancer spray incoming traffic, but not need to be in the return path from the servers to the client. IP spoofing is also used in some server side load balancing. Since each user will normally have its own IP address, commercial testing products (such as HP LoadRunner, WebLOAD, and others) can use IP spoofing, allowing each user its own "return address" as well. 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 will happen when the system goes "live" and a large number of users log in simultaneously. The use of packets with a false source IP address is not always evidence of malicious intent. Backscatter, a technique used to observe denial-of-service attack activity in the Internet, relies on attackers' use of IP spoofing for its effectiveness. 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. 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. 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. IP address spoofing is most frequently used in denial-of-service attacks, 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. By spoofing a connection from a trusted machine, an attacker on the same network may be able to access the target machine without authentication. #Ingress regress passwordFor 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 another machine on the internal network – which would require them already being logged in. This type of attack is most effective where trust relationships exist between machines. IP address spoofing involving the use of a trusted IP address can be used by network intruders to overcome network security measures, such as authentication based on IP addresses. It does not provide information on the identity of the sender or the computer being used. It may provide general information on the region, city and town when on the packet was sent. The source IP address provides only limited information about the sender. The protocol requires the receiving computer to send back a response to the source IP address, so that spoofing is mainly used when the sender can anticipate the network response or does not care about the response. 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. The protocol specifies that each IP packet must have a header which contains (among other things) the IP address of the sender of the packet. The basic protocol for sending data over the Internet network and many other computer networks is the Internet Protocol (IP). ![]()
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