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upNetworking Resources, TCP/IP Protocol References
DomainDossierInvestigate domains and IP addresses. Has an integrated Network and domain whois, does a service scan, and traceroute. Very useful! Part of the CentralOps free online network utilities.
Enter domain or IP address:   
domain whois record DNS records       traceroute
network whois record service scan      
DNS lookupResolve host names to IP addresses
Reverse DNS lookupResolve IP addresses to host names
Network Solutions's Whois"Comprehensive search across multiple WHOIS databases. Includes all domains, extensions regardless of where they are registered. No need to visit multiple WHOIS Directories."
PracticallyNetworked.com"Practical networking and Internet sharing information for your home or small office." Great site with how-tos and links to latest firmware upgrades for SMC Barricade Broadband routers.
Connected: An Internet Encyclopedia"A free, on-line reference that explains in detail how the Internet operates." - A great resource! Has the complete RFC database, a Internet (TCP/IP) architecture course, and to top it off you can download the entire site as a zip file and its free!
TCP/IP Tutorial and Technical OverviewFrom IBM - a 986 page PDF text - "This redbook provides an introduction as well as a reference to the Transmission Control Protocol/Internet Protocol (TCP/IP) suite of protocols and applications." Revised August 2001.
Computer Networks and InternetsFigures, animations, photos and other supplementary materials from Douglas Comer's book
IETF"The Internet Engineering Task Force is a large open international community of network designers, operators, vendors, and researchers concerned with the evolution of the Internet architecture and the smooth operation of the Internet.
Internet Traffic Report"The Internet Traffic Report monitors the flow of data around the world. It then displays a value between zero and 100. Higher values indicate faster and more reliable connections."
3D-TraceRouteWow! More than just a tracert replacement, has many network diagnostic functions, IP & port scanning, passive OS fingerprinting, many more, highly recommended! - and its free!!! TechRepublic has a review of the traceroute function.
VisualRoute"A visual, fast, and integrated ping, whois, and traceroute program that automatically analyzes connectivity problems, displaying the results on a World map" - trial version good for 15 days
Tracert "How long does it take to download your web-page? Is that page reachable from other locations ? Web site performance measurement and monitoring. Use 200+ Public Traceroute Gateways. DNS resolving. Register to use the tool free of charge."
Network-Tools.comTraceroute, Ping, Domain Name Server (DNS) Lookup, WHOIS, DNS Records, HTTP Headers, and E-Mail Relay Check
EtherealWell-regarded network protocol analyzer
RexSwain.comA number of small Perl programs among them a HTTP header viewer, which can also display external Javascript files.
Let me see my Web Server's responseA HTTP header viewer
Protocols.comInfo on almost every existing protocol
Windows TCP/IP Guide"This guide is meant to be a reference for learning NT server."
SamSpade.orgLots of online networking tools - including Sam Spade, an integrated network query tool for Windows 95, 98, NT4.0 & Windows 2000. It's freeware!
Bart's Network Boot Disk"A highly professional network boot disk for connecting to a network share on a Windows 9x/ME/NT4/2000/XP or Linux Samba machine. Also allows you to use network applications such as SSHDOS (secure shell) or Ghost Peer-to-peer/multicast, using Packet driver interface." Also MODBOOT - a modular boot disk.
Network Booting"Network booting -- often called "diskless booting" -- can dramatically simplify some tough system administration headaches. In a computer lab, a classroom, an Internet cafe, a Beowulf-style compute cluster, or a render farm, network booting can centralize system configuration and management, making it easier and faster to maintain, repair, and upgrade those networks of machines."
AnalogXGreat free programs! "From proxy servers to the fastest traceroute on the net, only AnalogX brings 'em to you for free..." and much more - some for techies, others anyone can find useful
How Network Address Translation WorksExcellent article on NAT
searchNetworking.com"Networking specific portal and search engine"
DSL/Cable Webserver"Here you will find all the information you need to setup and maintain your own webserver at home or office on your DSL or Cable connection."
Home PC Firewall Guide"A detailed personal resource guide to broadband (cable modem/DSL) and dial-up Internet security hacker protection for home and SOHO computer users.
Computer and Communication StandardsLinks to details on Internet protocols and standards
Novell ConnectionDesigned for the IS professional who uses Novell software in their company network - but has some other useful articles on networking in general, especially TCP/IP.
NetworkMagazine.comBack-issue LAN related articles, reviews, news, tutorials, and product guide
Network Design ManualSeries of articles on networking from Network Computing Online
Internetworking Terms and Acronyms"This glossary assembles and defines the terms and acronyms used in the internetworking industry."
Learn To Subnet"A free, lecture-based course on addressing TCP/IP Networks that includes IP Addresses and Subnetting. Topics include: Binary Math, IP Addressing (IP Address), Subnet Mask, and CIDR."
Subnet Masks and CIDR NetworksIP addressing fundamentals
The Internet ProtocolBasics of IP - a chapter from the book "Internet Core Protocols: The Definitive Guide"
Daryl's TCP/IP Primer"Addressing and Subnetting on the Near Side of the 'Net"
Understanding IP Addressing: Everything You Ever Wanted To KnowAddressing on the Net
Advanced IP Address CalculatorExcellent (and free) subnet/supernet (CIDR) calculator
Cisco - IP Subnet Calculation & Design"The purpose of this tool is to provide a way to calculate IP subnetting which is fast, easy, and error free. Doing such calculations manually is time consuming and susceptible to common mathematical mistakes (especially in conversions between binary and decimal numbers)."
Cisco Systems"Cisco Systems, Inc. (NASDAQ: CSCO) is the worldwide leader in networking for the Internet. Cisco products include routers, LAN and ATM switches, dial-up access servers and network management software. These products, integrated by the Cisco IOS software, link geographically dispersed LANs, WANs and IBM networks." See their innovative Cisco Education Network program, especially Networking Academy Program
Cisco Documentation Home PageMany technical documents on Cisco-specific and other internetworking technologies
Internetworking Technology Overview"This publication provides technical information on Cisco-supported internetworking technologies."
Internetwork Design Guide"This publication provides internetworking design and implementation information and helps you identify and implement practical internetworking strategies that are both flexible and scalable. This publication was developed to assist professionals preparing for Cisco Certified Internetwork Expert (CCIE) candidacy."
Internetwork Troubleshooting Guide"Provides the information necessary to troubleshoot many problems commonly encountered in internetworks using Cisco hardware and software products."
Connect WorldConnectivity resources: lots of links on networking - Pin-to-Pin Cable Diagrams
ITPRC"Internet Resources for the Network Professional"
Network World"Breaking news, in-depth reviews, technology overviews and forums."
Network Computing OnlineWeb site devoted to network computing
Data Communications Cabling FAQ"This is a Frequently Asked Questions (FAQ) document for the comp.dcom.cabling newsgroup. Topics covered include the types of cables (fiber, coax, copper, unshielded twisted pair-UTP, shielded twisted pair), installation techniques, standards as well as fire and building safety codes."
Charles Spurgeon's Ethernet Web SiteThis site provides extensive information about Ethernet (IEEE 802.3) local area network (LAN) technology, including the original 10 Megabit per second (Mbps) system, the 100 Mbps Fast Ethernet system (802.3u), and the Gigabit Ethernet system (802.3z).
FTP: File Transfer Protocol"Unlike the IETF FTP specifications, these pages describe how FTP actually works (and doesn't work) in practice."
SMTP"These pages are designed as a reference for the Simple Mail Transfer Protocol (SMTP)."
NTPAn overview of Network Time Protocol (NTP), which synchronizes clocks of hosts and routers in the Internet.
NTP.org"The purpose of this server is to provide the latest information on Network Time Protocol (NTP) and other related clock synchronization products."
Internet mail message header format"These pages are designed to be a complete, correct, comprehensible reference for the format of an Internet mail message header."
IETF RFCs"This is an HTML presentation of IETF STD-1, and RFC-INDEX information (2001/06/21)."
Streaming Media LandInfo on streaming media protocols
LFTLayer Four Traceroute, is a sort of 'traceroute' that often works much faster (than the commonly-used Van Jacobson method) and goes through many configurations of packet-filter based firewalls.
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