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Before we jump into the requisite port-scanning tools themselves, we must discuss the various port-scanning techniques available One of the pioneers of implementing various port-scanning techniques is Fyodor He has incorporated numerous scanning techniques into his nmap tool Many of the scan types we will be discussing are the direct work of Fyodor himself: TCP connect scan This type of scan connects to the target port and completes a full three-way handshake (SYN, SYN/ACK, and ACK), as the TCP RFC (Request for Comments) states It is easily detected by the target system Figure 2-4 provides a diagram of the TCP three-way handshake TCP SYN scan This technique is called half-open scanning because a full TCP connection is not made Instead, only a SYN packet is sent to the target port If a SYN/ACK is received from the target port, we can deduce that it is in the LISTENING state If an RST/ACK is received, it usually indicates that the port is not listening An RST/ACK will be sent by the system performing the port scan so that a full connection is never established This technique has the advantage of being stealthier than a full TCP connect, and it may not be logged by the target system However, one of the downsides of this technique is that this form of scanning can produce a denial of service condition on the target by opening a large number of half-open connections But unless you are scanning the same system with a high number of these connections, this technique is relatively safe TCP FIN scan This technique sends a FIN packet to the target port Based on RFC 793 (http://wwwietforg/rfc/rfc0793txt), the target system should send back an RST for all closed ports This technique usually only works on UNIXbased TCP/IP stacks

Like most word processors, Word offers left, right, centered, and justified alignment:

.

TCP Xmas Tree scan This technique sends a FIN, URG, and PUSH packet to the target port Based on RFC 793, the target system should send back an RST for all closed ports TCP Null scan This technique turns off all ags Based on RFC 793, the target system should send back an RST for all closed ports TCP ACK scan This technique is used to map out rewall rulesets It can help determine if the rewall is a simple packet lter allowing only established connections (connections with the ACK bit set) or a stateful rewall performing advance packet ltering TCP Windows scan This technique may detect open as well as ltered/ non ltered ports on some systems (for example, AIX and FreeBSD) due to an anomaly in the way the TCP windows size is reported TCP RPC scan This technique is speci c to UNIX systems and is used to detect and identify Remote Procedure Call (RPC) ports and their associated program and version number UDP scan This technique sends a UDP packet to the target port If the target port responds with an ICMP port unreachable message, the port is closed Conversely, if you don t receive an ICMP port unreachable message, you can deduce the port is open Because UDP is known as a connectionless protocol, the accuracy of this technique is highly dependent on many factors related to the utilization and ltering of the target network In addition, UDP scanning is a very slow process if you are trying to scan a device that employs heavy packet ltering If you plan on doing UDP scans over the Internet, be prepared for unreliable results Certain IP implementations have the unfortunate distinction of sending back reset (RST) packets for all ports scanned, regardless of whether or not they are listening Therefore, your results may vary when performing these scans; however, SYN and connect() scans should work against all hosts.

alignment is useful for putting text up against the right margin For example, you might create letterhead with the sender s address right-aligned

Figure 9-1 A cross section of a standard lock with key inserted, illustrating how lock pins are aligned

margin, except for the last line of the paragraph, which is allowed to fall short so that it doesn t require huge spaces between the words You may also need to align text vertically on the page for example, so that a title is centered vertically See the section Align Text Vertically on a Page in 5 for instructions You can set alignment in any of these ways: