![]() There are five network IP-scanner and network monitor tools in the market. Generally UDP scanner utilizes this scanning method, and use non-response to infer that port is not open. If a UDP packet generates and send to the port which is closed, an unreachable message is returned with an ICMP port. There is no connection in UDP therefore it is not equivalent and easy to TCP SYN Packet. This is third and most complex type of scan because there are technical challenges. This scan never open a full TCP connection, that’s why also refer as half open connection. The scanner creates raw IP packets and monitor and observe responses. The SYN is a second form of TCP scanning, rather than using operating system network functions for scanning. If the scanner found any port open, it’s immediately close it to prevent any vulnerable attack or DOS attack and if it’s fail an error code is returned. The simplest and most common port scanner use network functions of the operating system and when SYN scanning is not feasible for you then you can use TCP scanning. There are three types of Ip and port scanning : ![]() Almost sometime, there is a possibility that a host might send back weird packets or start generating false positives when TCP/IP is not compliant with RFC. There is an assumption that all ports scanning rely on that targeted host is compliant with RFC 793 – Transmission Control Protocol. ![]()
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