Linux Network Security (Administrator's Advantage Series) by Peter G(Peter G. Smith) Smith

By Peter G(Peter G. Smith) Smith

Deal with. regrettably, in present day surroundings all networks are capability hacker ambitions, from top-secret army examine networks to small domestic LANs. most modern Linux documentation focuses extra on ease of use than protection, so Linux community defense makes a speciality of securing Linux in a networked atmosphere, the place the safety of the total community has to be thought of, instead of simply remoted machines. this entire consultant offers a mixture of conception and functional thoughts to educate directors the best way to set up and use protection purposes, in addition to how they paintings and why they're useful of their networks. beginning with the necessity for defense and realizing the matter, the booklet teaches directors approximately packet filtering (firewalling) with iptables, hardening prone similar to Apache, BIND, Sendmail, FTP, and MySQL to avoid assaults, community research, encryption, neighborhood safeguard, DoS assaults, and rootkits. Auditing networks for power vulnerabilities and developing safe passwords also are explored. this is often the only e-book that actually information easy methods to safe a Linux community.

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5. html 6. htm 7. " Although slightly misleading, it's a commonly used figure of speech. 8. Sequence numbers are part of the reliability offered by TCP. In an established connection, they are incremented by a fixed amount with every packet dispatched, which allows the recipient to detect whether packets have arrived out of order, or have not arrived at all. " Phrack 49, file 14. org, 1996. de/~axel/bliss/, 2000. analysis, 1999. txt, 2001. pdf, 1993. html, 1995. Chapter 3: A Secure Topology OVERVIEW The previous chapter covered the rather intimidating array of vulnerabilities that can affect Linux systems and the network as a whole.

The Smurf Attack Perhaps the most dangerous of bandwidth-consuming DoS attacks is the Smurf, which first gained recognition in 1997 with the release of proof-of-concept code by TFreak. Since then, the Smurf—and it's descendent the Fraggle—have achieved widespread popularity with script kiddies everywhere. To understand how the Smurf works, we first need to take a brief detour into IP networking. You are probably already familiar with the concept of subnets, netmasks, segments, and so on (if not, the bibliography at the end of Chapter 3, "A Secure Topology," lists some good reading on the subject).

18, the server's SYN-ACK, which includes its ISN, is dispatched off to machine A (whose IP address is being spoofed by the attacker). This presents an immediate problem because A will promptly reply with an RST to reset this unknown connection attempt. The solution to this is to either wait until A is offline (for example, maintenance/ reboot), or forcefully prevent it from answering, such as by crippling A with a SYN flood. 18: Blind IP spoofing. The next problem is somewhat trickier. The attacker, X, cannot see the ISN sent by the B machine to A, and he needs this number to increment and echo back in Step 3 of the handshake.

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