Douglas Comer. "Internetworking with TCP/IP" . Prentic Hall, 1988.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....if options are present) Figure 2.2 shows the layout of the IP header. Each packet carries the 32 bit destination address and a 32 bit source address. Each packet is routed independently using only the destination address. For more details on the function of each field refer to Stevens [10] Comer [2], or RFC791 [7] version lth TOS length ID flags offset TTL proto checksum source address destination address options (if any) Figure 2.2: IP header. Internet addresses are assigned to an organization and are unique within the Internet. Host names can be associated with internet (IP) ....

Douglas Comer. "Internetworking with TCP/IP" . Prentic Hall, 1988.

....results and discussions on the throughput results. 2 TCP protocol In this Section some TCP properties which are mainly responsible for the performance of TCP on a transmission error free environment are briefly described (for more detail the interested readers can refer to the books by Comer [1] or Stevens [6] TCP provides a connection oriented, reliable, byte stream, transport layer service. The term connection oriented means that a client and a server using TCP must established a TCP connection with each other before they can exchange data. The application data is broken into ....

Douglas E. Comer, "Internetworking with TCP/IP", Vol. 1, Prentice Hall

....their routing decisions based on different views of the state of the network, routing loops may be formed and the packets caught in them may never reach their destinations. Temporary routing loops occur naturally, say when a link goes down, and solutions have been proposed to deal with them (e.g. [16]) Permanent routing loops or misrouting by a malicious router, depicted in Figure 3.1, are more serious problems. In an IP (Internet Protocol) network, packets have a time to live (TTL) field, which guarantees a packet will not stay in the network forever. Hence routing loops and misrouting can ....

D. Comer, "Internetworking with TCP/IP." Vol.1, Prentice Hall, 1991.

....Data link Router Router MAC MAC Data link Data link Data link MAC Fig.2 Conventional IP Networks 4. 2 Connectionless Services in Conventional Data Networks In IP networks, IP processing will be generally performed, whenever the IP packet is transferred to the other data link network segment [12]. This means that, in a large scaled network, the IP packet will experience many IP processing points between source and destination end stations. For example, when the IP packet is transferred from Toshiba s gateway host ( isl.rdc.toshiba.co.jp ) to a certain host in France ( chorus.chorus.fr ) ....

D.E.Comer, "Internetworking with TCP/IP", Prentice Hall, 1991.

....algorithm can be specified defining its particular interface, and including its configuration parameters as data members so it can be properly configured before learning. Studying algorithms as simple servers, they are in the group of servers with context (also named servers with state, see [3]) This property is important in a sense as it is not possible that a concrete algorithm could work with more than one client at the same time. Paying attention to figure 3, services offered by the IMachineLearningInterface are: ffl void conf algoritm( is used to configurate module ....

Douglas E. Comer. Internet Working with TCP/IP. prentice, 1995.

....adaptor boards. Using ttcp 3 , a benchmark very similar to NetPerf which we used, they showed that with a reliable protocol such as TCP IP over ATM, a maximum of 62 Mb s was the highest sustainable rate for their configuration. They also showed the effect of data packet sizes and window sizes [3] on such transfer rates. Luckenbach also used a Fore Systems ASX 100 ATM switch, Sun Sparc10 workstations, and both the Fore Systems SBA 100 and SBA 200 Sbus adapter boards. They highlighted the saw tooth phenomenon, measured delays caused by cell segmentation and reassembly, and used ttcp to ....

Comer, D., E., Internetworking with TCP/IP, Principles, Protocols, and Architectures, Volume 1, Prentice Hall, 1991.

....delivery, 3) Support for soft real time guarantees on delay and throughput, 4) Per request (or stream) rate control, 5) Ease of implementation on an autonomous disk, and (6) Scalability. Requirement (1) precludes the use of any proprietary protocol and mandates the use of Internet protocol [8]. Although TCP can address requirement (2) very easily, as we will see shortly, it lacks in requirements (3) and (4) Moreover, TCP with all its state information is not suitable for requirement (5) and thus may not scale well (requirement (6) UDP, on the other hand, lacks severely in ....

D. Comer. Internetworking with TCP/IP, volume 1. Prentice Hall, 1995.

....network, then the packets are transferred to the destination by forwarding them from satellite to satellite, using inter satellite links, as shown in Figure 1.2. 6 1. 2 Transmission Control Protocol The Transmission Control Protocol(TCP) is a connection oriented, end to end reliable protocol[Com95]. TCP is used by a number of major Internet applications to provide reliable data delivery (e.g. SMTP[Pos82] HTTP[BLFN96] and FTP[PR85] 1. TCP is connection oriented because two hosts must setup and establish a connection before any data exchange takes place. 2. TCP provides reliability by ....

....data is retransmitted. TCP uses a separate algorithm to compute this timeout interval, it is described in Section 1.2.1. At the receiver, the sequence numbers are used to correctly order segments that may be received out of order and to eliminate duplicates. 3. TCP utilizes sliding window protocol[Com95] to achieve flow control. A sliding window protocol makes efficient use of network bandwidth as it allows the sender to transmit multiple packets before waiting for an ACK. When an ACK is received by the sender, the window advances to allow one or more segments to be transmitted. 4. TCP uses a set ....

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Douglas E. Comer. Internetworking with TCP/IP, Volume I, Principles, Protocols, and Architecture. Prentice Hall, 3rd edition, 1995.

....In this chapter we discuss the design of the example on a relatively high level. For a more detailed description of the design we refer to appendix A. As a first example, we explain a general server fruitlet. This example shows a general server architecture to build TCP IP based Internet servers [Com95, CS93]. In example two, we show a prototype of an open HTTP server, which uses the basic architecture of example one. With example three we introduce an open message system. This architecture shows an open message organizer in order to integrate different common message systems. All examples use the ....

...., ClassLoader and abstractions of the basic data types like String , Integer and Character are placed in this core package. B.8.2 java.net Java was born into a networking world, thus one important package of classes is java.net . java.net includes abstractions of the Berkeley sockets for TCP IP [Com95] and some basic abstractions for Web URL s. B.8.3 java.awt This is the biggest package of the core library. It reflects a whole abstraction to a windowing toolkit. The awt (abstract windowing toolkit) framework provides a fully platform independent set of classes to build applications using a ....

D. Comer. Internetworking with TCP/IP, Vol I, Principles, Protocols and Architecture. Prentice Hall, 1995.

....updates of High LAN databases, e.g. SQL updates that replicate Low LAN database updates to the High LAN. The NP supports a specialized protocol, called the Pump Protocol, across the LAN interfaces for ease of re use and maintenance. The NP operates compatibly with protocols from the TCP IP suite [4]. TCP IP is usually described as supporting four layers (listed from lowest to highest) network access layer, internet layer, host host transport layer, and application layer. The Pump Protocol is implemented at the application layer and uses the services provided by the transport layer. Figure ....

....Pump Protocol Application Protocol Application Program Network Pump 4 Low LAN are permitted to open connections (and thereby transmit messages) to which users on the High LAN. 2. 1 Pump Protocol The Pump Protocol is a special purpose protocol implemented at the application layer [4] that defines the communications at this level between the NP and the Low Wrapper and High Wrapper. The protocols used below the application layer (transport, internet, and network interface layers) must support communication across Ethernet LANs. The Pump Protocol is specified in terms of the ....

Comer, D.E. Internetworking with TCP/IP, Vol. I, Second Ed., Prentice-Hall, 1991.

....from N. In this paper, we discuss how to use this universal addressing in a number of protocols for routing data messages to mobile computers, for establishing and maintaining mobile vir tual circuits, and for supporting mobile groups. 1. Introduction We consider a system, like the Internet [2] and [6] that consists of several computer networks. The computers in each network are classified into hosts and routers. Each network has one or more hosts and one or more routers. For convenience, we assume that each host is attached to exactly one network, and each router is attached to two or ....

D. Comer, Internetworking with TCP/IP, Volume I, Second Edition, Prentice-Hall Inc., 1991.

....to use this to hold the required header information. I decided to explore this option further, for as well as providing greater scope for designing a header with the exact elds required, it avoids unnecessary proliferation of protocol layers. 20 IP Options have a 1 byte header, consisting of [2]: a 1 bit Copy eld a 2 bit Option Class eld a 5 bit Option Number eld The 5 bit Option Number eld is not fully utilised, there being only 8 recognised options at present, with space for a further 24 available within a 5 bit eld. Therefore, de ning a new IP option is possible, and ....

....modi cation would be challenging, although not impossible. 3 refer Section 5.2 24 Chapter 5 ATM over IP: Implementation Detail 5. 1 The proposed IP header extension The IP option I propose to be used with ATM over IP is 16 bytes (4 words) in length and has this structure: 1 byte option header [2]. 3 byte ATM call reference number. This is required to demultiplex incoming packets that contain ATM signalling information in their payload. This number is unique for a given connection where the converter is the Master for this connection. Given that a converter will, on average, be the ....

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Douglas E. Comer. Internetworking with TCP/IP, volume 1, chapter 7.8, pages 100-101. Prentice Hall, third edition, 1995.

....Organisation for Standardisation (ISO) s Reference Model of Open System Interconnection (the ISO model) contains 7 conceptual layers: physical, link, network, transport, session, presentation, and application. For the functionality of the layers, see Comer s Internetworking with TCP IP (Volume I) [20]. 3 hub An electronic device to which multiple computers attach, usually using twisted pair wiring. A bub simulates a network that interconnects the attached computers. Hub technology is popular for Ethernets. 20] source host A host on which ping runs. Also referred to as source pinging host ....

....functionality of the layers, see Comer s Internetworking with TCP IP (Volume I) 20] 3 hub An electronic device to which multiple computers attach, usually using twisted pair wiring. A bub simulates a network that interconnects the attached computers. Hub technology is popular for Ethernets. [20] source host A host on which ping runs. Also referred to as source pinging host or pinging host. destination host A host to which ping sends request packets and from which it expects reply packets. For a description of how ping works, see Section 3.2.1. process A running copy of a computer ....

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D. E. Comer. Internetworking with TCP/IP, volume I. Prentice-Hall, Inc., Englewood Clis, New Jersy 07632, 3rd edition, 1995.

....i g to compute short term estimates of the means, variances, and distributions of these quantities. For example, Delta RTT i Gamma R ; R R j 1 Delta; oe 2 R oe 2 R j 2 ( Delta 2 Gamma oe 2 R ) where j 1 and j 2 are constants such as 1 8 and 1 4, respectively, as in TCP [71]. Then, using the relations (3) and (4) in Section 2, the parameters of a translated Gamma distribution for RTT can be computed as R minfR ; RTT i g; ff R (R Gamma R ) oe 2 R ; nR (R Gamma R )ff R : The same can be done for d FTT and d BTT . Clearly, the forward and backward trip ....

D.E. Comer. Internetworking with TCP/IP, volume 1. Prentice-Hall, 3 edition, 1995.

....these attacks. 1.1 Low level Network Protocols For our purposes, low level network protocols shall be those protocols that are at or below the Transport layer of the International Organization for Standardization s (ISO) reference model. Further information about the ISO model can be found in [Com95] and [Tan88] We define low level IP procotols as those protocols in the TCP IP Internet Protocol Suite that are low level network protocols. This includes the Internet Protocol itself and its support protocols such as Internet Control Message Protocol (ICMP) Internet Group Management Procotl ....

....Fragment Overrun attack and then look at why ping is useful for exploiting the vulnerability. The Fragment Overrun attack involves an attacker sending a sequence of specially constructed fragments of an IP datagram to a target machine. For a discussion of IP fragmentation, see section 2.2. 1 or [Com95] A Fragment Overrun attack sends a stream of fragments that if assembled would create an IP datagram of length greater than 65535. To see that this is possible, consider a fragment with offset of 8191, header length of 5 (the minimum) and total length of 65535. When assembled, the fragment ....

D. E. Comer. Internetworking with TCP/IP. Prentice-Hall, third edition, 1995.

....provides the necessary functionality that is needed by application programs. The presentation layer provides all the necessary ways to transform the data of the end users. The application layer is for application programs that are commonly provided by the networks like email and file transfer [Comer 1988]. In real life TCP IP is widely used, not the ISO model. TCP IP is based on a model with only five layers: physical layer, network interface layer, internet layer, transport layer and application layer. It is also often called the Internet model. The ARPANET was developed by the United States ....

....name because people would like to remember machines by names not by a long string of numbers. DNS is used to map names of machines into their corresponding IP addresses respectively. More concepts and detailed explanations about IP, TCP, UDP, DNS, and WWW, etc. can be found in [Tanenbaum 1996] and [Comer 1988]. 2.2 Brief Introduction to Wireless Networks Radio techniques started the wireless communication. They evolved into ocean vessel radio, vehicular mobile radio and aircraft radio. But the moving distance is limited. AMPS is the result of extensive research by Bell Labs in 1960s and 1970s [Redl ....

Douglas E. Comer, Internetworking with TCP/IP, ISBN: 0-13-470154-2, Englewood Cliffs, NJ, Prentice Hall, 1988.

....(N 1) Capability4 (N 1) N) N 1) Service Access Point Figure 1: The service concept as related to a client server model. S E R V I C E 1. MBone is a teleservice providing the users with the multicasting facility offered by the class D addressing scheme of the IP (Internet Protocol) [RFC1112 and Com91]. Figure 2: Illustrating the service related IP class D MBone Software nv, vat,wb Equipments mrouters videoconferencing, teleteaching, etc. Bearer service Teleservice Service access tools Applications Basic Supplementary Services terminology with the MBone example. ....

D.E. Comer, Internetworking with TCP/IP, Vol. 1, Prentice Hall, Englewood Cliffs, New Jersey, 1991.

....3.3. 2 Transmission Control Protocol In this section we specify the Transmission Control Protocol (TCP) The TCP is intended for use as a highly reliable host to host protocol between hosts in packet switched computer communication networks, and in interconnected systems of such networks [11]. The operation of TCP can be described in CTSM. Figure 3.7 shows communication channels through which TCP communicates with application programs and networks. The incoming channels, open, close and timeout represent commands from the application programs. Two channels ch1 and ch2 represent i o ....

....be described in CTSM. Figure 3.7 shows communication channels through which TCP communicates with application programs and networks. The incoming channels, open, close and timeout represent commands from the application programs. Two channels ch1 and ch2 represent i o connections with networks. [11] summarizes the operation of TCP as follow: The TCP software at each endpoint begins in CLOSED state. Application programs must issue either a passiveopen command (to wait for a connection from another machine) or an activeopen command (to initiate a connection) An active open command forces ....

Douglas E. Comer. Internetworking with TCP/IP, Volume I: Principles. Protocols, and Architecture. Prentice Hall, 1991.

....delivery, 3) Support for soft real time guarantees on delay and throughput, 4) Per request (or stream) rate control, 5) Ease of implementation on an autonomous disk, and (6) Scalability. Requirement (1) precludes the use of any proprietary protocol and mandates the use of Internet protocol [10]. Although TCP can address requirement (2) very easily, as we will see shortly, it lacks in requirements (3) and (4) Moreover, TCP with all its state information is not suitable for requirement (5) and thus may not scale well (requirement (6) UDP, on the other hand, lacks severely in ....

D. Comer. Internetworking with TCP/IP, volume 1. Prentice Hall, 1995.

....delivery, 3) Support for soft real time guarantees on delay and throughput, 4) Per request (or stream) rate control, 5) Ease of implementation on an autonomous disk, and (6) Scalability. Requirement (1) precludes the use of any proprietary protocol and mandates the use of Internet protocol [7]. Although TCP can address requirement (2) very easily, as we will see shortly, it lacks in requirements (3) and (4) Moreover, TCP with all its state information is not suitable for requirement (5) and thus may not scale well (requirement (6) UDP, on the other hand, lacks severely in ....

D. Comer. Internetworking with TCP/IP, volume 1. Prentice Hall, 1995.

....(e.g. routers and switches) forward the message only on those links that ultimately lead to a receiver. The Internet protocol (IP) and asynchronous transfer mode (ATM) are the two dominant network layer protocols in today s infrastructure. Their service models are discussed below: ffl IP [28] was originally designed to provide best effort datagram service with no guarantees on delay, delay jitter, or drop rate. Researchers in the Internet Engineering Task Force (IETF) are currently extending the IP protocol suite to offer QoS guarantees [19, 27] QoS classes under development include ....

....same campus network. GNU MEM BIR TAU JKV MSB AUB MBJ GIT UMD WVU KNX LEX CTV NOF NEO 3 Mbit s Link 1.5 Mbit s Link Campus Network Multicast Routing Tree Source Campus Network JCK Figure 3.1: SURAnet infrastructure and topology. We use the Internet Protocol version 4 (IPv4) [28] as the network layer protocol. The IPv4 protocol specification provides best effort datagram service; that is, the network makes no guarantees on throughput, transmission delay, transmission delay variation, delivery order, or drop rates. The basic IP packet consists of a source address, ....

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Douglas E. Comer. Internetworking with TCP/IP, Second Edition. Prentice Hall, 1991. Bibliography148

....to become at most a (4ffi 1) near planar graph. Second, there are several different application areas which naturally yield ffi near planar graphs that are not planar. These include wide area communication networks (e.g. the ARPA network in [Sc77] is 0:2 near planar, and the NSFNET backbone in [Com91] is 0:4 near planar) radio networks [Ra93] and finite element analysis [Te91, Va91] These graphs naturally come with ffi near planar layouts. Third, the interaction graphs for nonserial optimization problems [LT80, Ro82] corresponding to planar 2 (b) a) 1 4 K n Figure 1: Figures ....

D. E. Comer, Internetworking with TCP/IP, Vol. I, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1991.

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D. Comer, "Internetworking with TCP/IP", MacGraw Hill, 1989

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D. E. Comer and D. L. Stevens, Internetworking with TCP/IP, Vol. 2. Englewood Cliffs, New Jersey: Prentice Hall, 1991.

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D. E. Comer, Internetworking with TCP/IP, Vol. 1. Englewood Cliffs, New Jersey: Prentice Hall, 3rd ed., 1995.

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