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application before on your Windows system, you should know that this is a packet filter driver that allows nmap to read and write raw packets from and to the wire As you can see in Figure 2-3, nmap for Windows allows for a number of ping options to discover hosts on a network These host discovery options have long been available to the UNIX world, but now Windows users can also leverage them As mentioned previously, nmap does provide the capability to perform ICMP sweeps However, it offers a more advanced option called TCP ping scan A TCP ping scan is initiated with the PT option and a port number such as 80 We use 80 because it is a common port that sites will allow through their border routers to systems on their demilitarized zone (DMZ), or even better, through their main firewall(s) This option will

The author has interviewed hundreds of people over the last five years who were involved in computer security, information warfare planning, intelligence gathering, and law enforcement These interviews were conducted for a variety of projects, including market analysis, product evaluations, and articles for journals and magazines It is important to note that during all of these projects the people who were interviewed did not compromise any sensitive material Although their input helped the author forage out the perspectives that are the foundation of this analysis, the work in this book is an independent perspective and is by no means to be considered an expos of insider or confidential information regarding military or law enforcement operations

2:

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spew out TCP ACK packets to the target network and wait for RST packets indicating the host is alive ACK packets are sent because they are more likely to get through a nonstateful firewall such as Cisco IOS Here s an example:

[root] nmap -sP -PT80 19216810/24 TCP probe port is 80 Starting nmap V 468 Host (19216810) appears to be up Host (19216811) appears to be up Host shadow (192168110) appears to be up Host (192168111) appears to be up Host (192168115) appears to be up Host (192168120) appears to be up

1

(192168150) appears to be up (1921681101) appears to be up (1921681102) appears to be up (1921681255) appears to be up run completed (10 hosts up) scanned in 5 seconds

As you can see, this method is quite effective in determining if systems are alive, even if the site blocks ICMP It is worth trying a few iterations of this type of scan with common ports such as SMTP (25), POP (110), AUTH (113), IMAP (143), or other ports that may be unique to the site For the advanced technical reader, Hping2 from wwwhpingorg is an amazing TCP ping utility for UNIX that should be in your toolbox With additional TCP functionality beyond nmap, Hping2 allows the user to control specific options of the UDP, TCP, or Raw IP packet that may allow it to pass through certain access control devices To perform a simple TCP ping scan, set the TCP destination port with the p option By doing this you can circumvent some access control devices similar to the traceroute technique mentioned in 1 Hping2 can be used to perform TCP and UDP ping sweeps, and it has the ability to fragment packets, potentially bypassing some access control devices Here s an example:

Information warfare strategies and tactics have been of utmost concern to defense planners in industrialized nations since the middle of the 1980s The growth in popularity of the Internet and the widespread use of the World Wide Web and related technologies have dramatically increased this concern The US Department of Defense and its counterparts in NATO and other military alliances have been training both offensive and defensive information technology warriors since the late 1980s This concern and the training that has evolved have been primarily focused on the protection or the destruction of the strategic information infrastructure and military technologies There is no doubt that the protection of these technology assets should be of concern, as should the ability of the military to attack and disable or destroy the information infrastructure of enemy states as an offensive strategy or counteroffensive measure This perspective, although sound within itself, is

[root]# hping2 19216802 -S -p 80 -f HPING 19216802 (eth0 19216802): S set, 40 data bytes 60 bytes from 19216802: flags=SA seq=0 ttl=64 id=418 win=5840 time=32 ms 60 bytes from 19216802: flags=SA seq=1 ttl=64 id=420 win=5840 time=21 ms 60 bytes from 19216802: flags=SA seq=2 ttl=64 id=422 win=5840 time=20 ms --- 19216802 hping statistic --3 packets tramitted, 3 packets received, 0% packet loss

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