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      "body": "![f3b389d662e01c7d.jpg](https://steemitimages.com/DQmNMnwFsKhrriRxXgT1xcj2zLtGJZBkrdYJkRRSEG1pdiB/f3b389d662e01c7d.jpg)\n\nIn the world of information security, port scanning is a vital part. Enterprises, organizations or regular users use port scans to probe systems for open ports and their respective services. If you think of a computer as a hallway of doors, port scanning can be compared with walking through the hallway looking for open doors...\n\nPenetration testers like myself use this information to find entry ways into the computer. Port scanning is part of the 'active reconnaissance' phase, a vital part of any penetration test. I aim to explain to you a few of the basic concepts of port scanning..\n\n\n![shutterstock_1593153591-768x512.jpg](https://steemitimages.com/DQmTJBKidLsaaehrkzjgLDmVQ2c1QV4YfS7vPZaiRDtM2Ge/shutterstock_1593153591-768x512.jpg)\n\n\n# PING SCAN\nPing Scans are used to sweep a whole network block or a single target to check to see if the target is alive. It sends an ICMP echo request to the target – if the response is an ICMP reply, then you know the target is alive. However, it is increasingly becoming more common that ICMP pings are being blocked by firewalls and routers that you will likely have to resort to other methods to accurately tell if the target is alive.\n\n![Check-Your-Open-Rate-First_ReportChimp.jpg](https://steemitimages.com/DQmUga8wXG9mkPGdoGJosVcZoNMr9PLL3U1BxoWvoE4c6m7/Check-Your-Open-Rate-First_ReportChimp.jpg)\n\n\n# TCP HALF-OPEN\nThis is probably the most common type of port scan. This is a relatively quick scan that can potentially scan thousands of ports per second. It works this way because it does not complete the TCP handshake process. It simply sends a packet with the SYN flag set and waits for the SYN-ACK from the target and does not complete the connection.\n\nWhen you initiate a TCP connection you first send a packet with the SYN (synchronize) flag set to the destination. The destination then acknowledges this synchronize request with a packet with the SYN-ACK (synchronize-acknowledge) flag set. Finally, the sender acknowledges that it got the SYN-ACK response packet by sending the destination a packet with the ACK flag set. Now, a connection is established.\n\nBy not sending the final ACK packet to the target after receiving a SYN-ACK, a connection is not established; however, you now know if the target/port is available and listening.\n\n\n![Cahoots-Connect-1024x504.jpg](https://steemitimages.com/DQmcgknsLLrCgTScmXw5v6dYj7qAaMzDCJJmphLZNifrdfa/Cahoots-Connect-1024x504.jpg)\n\n\n# TCP CONNECT\nThis is essentially the same as the half-open scan above but instead, we finish the handshake process and establish a connection by sending the final ACK packet. This is a much slower means of port scanning as it takes more packets to finish.\n\n![googlescholar-660x330.jpg](https://steemitimages.com/DQmW2e8tyTixsi4jcyVDaDrLcVpRmV48GVLDSScgkGcEw1c/googlescholar-660x330.jpg)\n\n\n# UDP\nUDP scans are most common to detect DNS, SNMP and DHCP services. UDP scans work by sending a packet, which is usually empty. This can be changed or even set to a random payload for each port.\n\nThe problem with using any communication with UDP is that it is unreliable – it has no way of creating an established connection or synchronizing the packets like TCP does. For this reason, UDP scans are typically slow. Because you are waiting for a packet that may never come, nor do you have any real way of telling if the packet even got there in the first place, you might have to send numerous packets then wait to make sure a port is considered open or filtered.\n\n![maxresdefault.jpg](https://steemitimages.com/DQmP5Godsmgp88nDicyLrPp1Cks7EQ1npUcrhZUbps1JNsG/maxresdefault.jpg)",
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