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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 will happen when the system goes "live" and a large number of users log in simultaneously.
Once a suitable zombie is found the next step would be to try to establish a TCP connection with a given service (port) of the target system, impersonating the zombie. It is done by sending a SYN packet to the target computer, spoofing the IP address from the zombie, i.e. with the source address equal to zombie IP address.
Every ISP runs a DNS server to allow their customers to translate domain names into IP addresses that computers understand and use. When an ISP's DNS server receives a request to translate a name, according to RFC the DNS server should return the associated IP address to the customer's computer which is then able to connect to the requested ...
As more and more networks begin to conform to RFC 3704 and other anti-spoofing practices, the IP address becomes more reliable as a "same source" identifier. Therefore, the security of a web site can be improved by verifying that the source IP address is consistent throughout a session.
1) Fantaip: Fantaip [10] is a program that spoofs IP addresses for use with sockstress. It achieves this by sending ARP replies to hosts which perform a request for the spoofed IP. To use fantaip, type 'fantaip -i interface CIDR', e.g., 'fantaip -i eth0 192.168.0.128/25'.
There are two primary types of IP addresses in use today: IP version 4 (IPv4) and IP version 6 (IPv6). The former has been around since January 1983 , and is still the most common.
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In the context of information security, and especially network security, a spoofing attack is a situation in which a person or program successfully identifies as another by falsifying data, to gain an illegitimate advantage.