i've been waiting for this book! "TCP/IP Network Administration was the first book of practical information for the professional TCP/IP network administrator, and it is still the best. " TCP/IP is a set of communications protocols that define how different types of computers talk to each other.-----VERY IMPORTANT! transmission control protocol - TCP internet protocol - IP intense shit! "The TCP/IP protocols were adopted as Military Standards (MIL STD) in 1983, and all hosts connected to the network were required to convert to the new protocols. To ease this conversion, DARPA[2] funded Bolt, Beranek, and Newman (BBN) to implement TCP/IP in Berkeley (BSD) Unix. Thus began the marriage of Unix and TCP/IP." "About the time that TCP/IP was adopted as a standard, the term Internet came into common usage. In 1983 the old ARPAnet was divided into MILNET, the unclassified part of the Defense Data Network (DDN), and a new, smaller ARPAnet. "Internet" was used to refer to the entire network: MILNET plus ARPAnet." it just keeps coming with awesomeness! "In 1985 the National Science Foundation (NSF) created NSFNet and connected it to the then-existing Internet. The original NSFNet linked together the five NSF supercomputer centers. It was smaller than the ARPAnet and no faster: 56Kbps. Still, the creation of the NSFNet was a significant event in the history of the Internet because NSF brought with it a new vision of the use of the Internet. NSF wanted to extend the network to every scientist and engineer in the United States. To accomplish this, in 1987 NSF created a new, faster backbone and a three-tiered network topology that included the backbone, regional networks, and local networks. In 1990 the ARPAnet formally passed out of existence, and in 1995 the NSFNet ceased its role as a primary Internet backbone network." awesome how it capitalizes Internet, it's like a god! TCP/IP are open protocols, everyone can use them RFC- request for comment different sub protocols are called stacks data moves down the stacks until it reaches the physical layer data moves up and down stacks twwo important rfc's RFC 826, Address Resolution Protocol (ARP), which maps IP addresses to Ethernet addresses RFC 894, A Standard for the Transmission of IP Datagrams over Ethernet Networks, which specifies how IP datagrams are encapsulated for transmission over Ethernet networks there are different versions of internet protocol. ipv4 is most widely used internet protocol does not check data a whole piece of data is called datagram - which is divided into packets tcp is reliable, udp is fast ipv6 creates to solve the lack of addresses using tcpip for skateboarding heavy! "A name indicates what we seek. An address indicates where it is. A route indicates how to get there." cool you can use SMTP on command line: "$ telnet crab 25 Trying 172.16.12.1... Connected to crab.wrotethebook.com. Escape character is '^]'. 220 crab.wrotethebook.com ESMTP Sendmail 8.9.3+Sun/8.9.3; Thu, 19 Apr 2001 16:28:01-0400 (EDT) HELO rodent.wrotethebook.com 250 crab.wrotethebook.com Hello rodent [172.16.12.2], pleased to meet you MAIL FROM: 250 ... Sender ok RCPT TO: 250 ... Recipient ok DATA 354 Enter mail, end with "." on a line by itself Hi Tyler! . 250 QAA00316 Message accepted for delivery QUIT 221 crab.wrotethebook.com closing connection Connection closed by foreign host. " SMTP direct delivery - without internet? it would be VERY easy to write a mail program vision of the future: " In a perfect file-sharing environment, the user neither knows nor cares where files are actually stored." mime is an extension of what is constituted as "mail" chapter 4 @ 8:33 every interface on a TCPIP network has to have a unique IP address tcpdump can be run on the shell in verbose mode to capture packets and STEAL PASSWORDS the terms packet and datagram are interchangable The ifconfig command sets, or checks, configuration values for network interfaces arp - address resolution protocol "Almost all data communication takes place via serial interfaces. A serial interface is just an interface that sends the data as a series of bits over a single wire, as opposed to a parallel interface that sends the data bits in parallel over several wires simultaneously. " im getting tireeeeddd ppp is the internet standard serial communication protocol ifconfig is the most commonly used interface configuration command. sounds important!:"Routing is the glue that binds the Internet together" routing table tells system which addresses are available routing information protocol - tells system best routes for internal routing (least "hops") cooool:"Split horizon and poison reverse are two features that attempt to avoid counting to infinity. Here's how: Split horizon With this feature, a router does not advertise routes on the link from which those routes were obtained. This would solve the count-to-infinity problem described above. Using the split horizon rule, crab would not announce the route to subnet 3 on subnet 12 because it learned that route from the updates it received from horseshoe on subnet 12. While this feature works for the previous example described, it does not work for all count-to-infinity configurations. (More on this later.) Poison reverse This feature is an enhancement of split horizon. It uses the same idea: "Don't advertise routes on the link from which those routes were obtained." But it adds a positive action to that essentially negative rule. Poison reverse says that a router should advertise an infinite distance for routes on this link. With poison reverse, crab would advertise subnet 3 with a cost of 16 to all systems on subnet 12. The cost of 16 means that subnet 3 cannot be reached through crab." i think rfc's are probably the best books ever. refering to autonomous systems as 'monoliths' two types of routing: static and dynamic. it's beautiful outside, and im indoors reading. i've relocated to the backyard. BINd controls DNS on UNIX systems ??:" Configuring a printcap file is the scariest part of setting up a Unix print server" samba can automate sharing resources between comps verrrry personal:"Before leaving the topic of NIS, I should say a word about NIS+. It will be a short discussion, because I do not use NIS+ and do not know much about it." dhcp - dynamic host config protocol one day is 86400 seconds everything in a network is controlled by .conf files placed in certain directories NFS - network file system chapter 10 is about sendmailll.....boroororrrinngnggg i have a feeling that setting up sendmail is really boring, frustrating , and tedious apache server converts http apache controls all website security shittt encrypted passwords are stored in the /etc/shadow file md5 algorthm creates one time passwords in opie "intruders love programs that start with a . " SATAN Security Auditing Tool for Analyzing Networks is the first network-based security scanner that became widely distributed. Somewhat outdated, it is still popular and can detect a wide range of known security problems. SATAN has spawned some children, SAINT and SARA, that are also popular.