An Overview of Wiring Requirements to Support Residential DSL Service
Digital Subscriber Line (DSL) refers to a set of technologies used to provide broadband services via the existing copper cable plant. One variation of DSL is Asymmetric Digital Subscriber Line or ADSL, which has become very popular for residential internet access. ADSL can provide a subscriber […]

http://tldp.org/HOWTO/Adv-Routing-HOWTO/
Exploring your current configuration
This may come as a surprise, but iproute2 is already configured! The current commands ifconfig and route are already using the advanced syscalls, but mostly with very default (ie. boring) settings.
The ip tool is central, and we’ll ask it to display our interfaces for us.
3.4.1. ip shows us our links
[ahu@home ahu]$ ip […]

iperf is a tool for performing network throughput measurements. It can test either TCP or UDP throughput. To perform an iperf test the user must
establish both a server (to discard traffic) and a client (to generate traffic).
======================================= Server side:
./iperf -s
Client connecting to 192.168.202.62, TCP port 5001
TCP window […]

In this tutorual will go over the most useful netcat commands. Netcat is a tool that every IT professional should have in their tool box, if you’re responsible for network or systems security, it is essential that you understand the capabilities of netcat. The original version of netcat is a UNIX program. Its author is […]

Many new workstations and servers are coming with integrated gigabit (define) network cards, but quite a few people soon discover that they can’t transfer data much faster than they did with 100 Mb/s network cards. Multiple factors can affect your ability to transfer at higher speeds, and most of them revolve around operating system settings. […]

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RJ-45 connectors
Een RJ-45 connector (RJ = Registered Jack, geregistreerde insteekplug) is een 8-polige modulaire connector die vooral gebruikt wordt voor twisted pair ethernetverbindingen en ISDN-telefonie, maar ook voor RS-232.
Afhankelijk van de toepassing is een andere benaming 8P8C (8 positions/posities, 8 conductors/geleiders), 8P6C of 8P4C (bijvoorbeeld ISDN).
[…]

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Internet- en netwerkprotocollen
Toepassingslaag DNS FTP Gopher HTTP HTTPS IMAP IRC NNTP POP3 RTP SIP SMTP SNMP SSH SSL Telnet UUCP XMPP
Transportlaag DCCP SCTP TCP UDP
Netwerklaag ARP ICMP […]

1000BASE-T capable PCI-X network interface card from Intel
1000BASE-T (also known as IEEE 802.3ab) is a standard for gigabit Ethernet over copper wiring.
Each 1000BASE-T network segment can be a maximum length of 100 meters (328 feet), and must utilize “Category 5″ cabling at a minimum. Category 5e cable or Category 6 cable may also be used […]

By Aaron Weiss
November 8, 2005
The story of the Linksys Wireless-G Router (model WRT54G) and how you can turn a $60 router into a $600 router is a little bit CSI and a little bit Freaks & Geeks. It’s also the story of how the open source movement can produce a win-win scenario for both consumers […]

http://www.kloth.net/services/iplocate.php
* Conversion of a 32bit IPv4 IP address between 4 formats: dotted quad decimal octet string (classic standard notation), decimal (base 10), hex (base 16) and binary (base 2).
* Reverse DNS lookup (PTR) with the host utility and another host lookup on that result — to […]

By default, SSH Secure Shell does not impose any login restrictions in addition to those provided by the operating system. However, you can restrict connections based on host, user name, or group.
The restrictions are defined in the sshd2_config file using the following syntax:
keyword pattern
Note: All the patterns used in the examples below are in accordance […]

For security reasons it is not a good idea to permit ssh root direct login, it is better to login as another user, and then switch to root using the ’su -’ comand, to do this, you need to disable root from login directly using ssh protocol, this will decrease the possibility of a hacker […]

· Berkeley DB
· OpenSSL
· libpcap
· libnids
· libnet
arpspoof
redirect packets from a target host (or all hosts) on the LAN intended for another local host by forging ARP replies. this is an extremely effective way of sniffing traffic on a switch. kernel IP forwarding (or a userland program which accomplishes the same, e.g. fragrouter :-) must be […]

¥ Words from the Past
Arpa Network Working Group Bob Metcalfe (PARC-MAXC) Request for Comments: 602 Dec 1973
“The Stockings Were Hung by the Chimney with Care”
The ARPA Computer Network is susceptible to security violations for at least the three following reasons:
(1) Individual sites, used to physical limitations on machine access, have not yet taken sufficient precautions […]

Cain & Abel is a password recovery tool for Microsoft Operating Systems. It allows easy recovery of various kind of passwords by sniffing the network, cracking encrypted passwords using Dictionary, Brute-Force and Cryptanalysis attacks, recording VoIP conversations, decoding scrambled passwords, recovering wireless network keys, revealing password boxes, uncovering cached passwords and analyzing routing protocols. The […]

Ettercap is a suite for man in the middle attacks on LAN. It features sniffing of live connections, content filtering on the fly and many other interesting tricks.
It supports active and passive dissection of many protocols (even ciphered ones) and includes many feature for network and host analysis.

: The fastest available WEP/WPA cracking tool
Aircrack is a suite of tools for 802.11a/b/g WEP and WPA cracking. It can recover a 40 through 512-bit WEP key once enough encrypted packets have been gathered. It can also attack WPA 1 or 2 networks using advanced cryptographic methods or by brute force. The suite includes […]

http://freeworld.thc.org/thc-hydra/
A Fast network authentication cracker which supports many different services
When you need to brute force crack a remote authentication service, Hydra is often the tool of choice. It can perform rapid dictionary attacks against more then 30 protocols, including telnet, ftp, http, https, smb, several databases, and much more. Like THC Amap this release is […]

http://www.monkey.org/~dugsong/dsniff/faq.html
dsniff is a collection of tools for network auditing and penetration testing. dsniff, filesnarf, mailsnarf, msgsnarf, urlsnarf, and webspy passively monitor a network for interesting data (passwords, e-mail, files, etc.). arpspoof, dnsspoof, and macof facilitate the interception of network traffic normally unavailable to an attacker (e.g, due to layer-2 switching). sshmitm and webmitm implement active […]

Top 100 Network Security Tools
After the tremendously successful 2000 and 2003 security tools surveys, Insecure.Org is delighted to release this 2006 survey. I (Fyodor) asked users from the nmap-hackers mailing list to share their favorite tools, and 3,243 people responded. This allowed me to expand the list to 100 tools, and even subdivide them into […]