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For the first possibility, consider what a human might do in the message dictation scenario If the speaker didn't understand the ``OK'' or ``Please repeat that'' reply from the receiver, the speaker would probably ask ``What did you say '' (thus introducing a new type of sender-to-receiver packet to our protocol) The speaker would then repeat the reply But what if the speaker's ``What did you say'' is corrupted The receiver, having no idea whether the garbled sentence was part of the dictation or a request to repeat the last reply, would probably then respond with ``What did you say '' And then, of course, that response might be garbled Clearly, we're heading down a difficult path A second alternative is to add enough checksum bits to llow the sender to not only detect, but recover from, bit errors This solves the immediate problem for a channel which can corrupt packets but not lose them A third approach is for the sender to simply resend the current data packet when it receives a garbled ACK or NAK packet This, however, introduces duplicate packets into the sender-to-receiver channel The fundamental difficulty with duplicate packets is that the receiver doesn't know whether the ACK or NAK it last sent was received correctly at the sender Thus, it can not know a priori whether an arriving packet contains new data or is a retransmission!.

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The type of service field requests that a specific level of service be offered to the datagram Some applications may require quick responses to reduce network delays, greater reliability, or higher throughput The total length field states the total length of the datagram (including both header and data) A maximum value of 65,536 bytes is usually imposed, but many networks may only support smaller sizes All networks are guaranteed to support a minimum of 576 bytes The identification field allows datagrams that are part of a sequence to be uniquely identified This field can be thought of as a sequence number, allowing ordering of datagrams that arrive out of sequence Sometimes when packets are sent between network gateways, one gate-way will support only smaller packets The flags field controls whether these datagrams may be fragmented (sent as smaller pieces and later reassembled) Fields marked "do not fragment" are discarded and are undeliverable As datagrams are routed across the Internet, congestion throughout the network or faults in intermediate gateways may cause a datagram to be routed through long and winding paths So that datagrams don't get caught in infinite loops and congest the network even further, the time-to-live counter (TTL) field is included The value of this field is decremented every time it is routed by a gateway, and when it reaches zero the datagram is discarded It can be thought of as a self-destruct mechanism to prevent network overload The protocol type field identifies the transport level protocol that is using a datagram for information transmission Higher-level transport protocols rely on IP for sending messages across a network Each transport protocol has a unique protocol number, defined in RFC 790 For example, if TCP is used, the protocol field will have a value of 6 To safeguard against incorrect transmission of a datagram, a header checksum is used to detect whether data has been scrambled If any of the bits within the header have been modified in transit, the checksum is designed o detect this, and the datagram is discarded Not only can datagrams become lost if their TTL reaches zero, they can also fail to reach their destination if an error occurs in transmission The next two fields contain addressing information The source IP address field and destination IP address fields are stored as two separate 32-bit values Note that there is no authentication mechanism to prove that a datagram originated from the specified source address Though not common, it is possible to use the technique of "IP spoofing" to make it appear that a datagram originated from a specific address, such as a trusted host The final field within the datagram header is an optional field that is not always present The datagram options field is of variable length, and contains flags to control security settings, routing information, and time stamping of individual datagrams The length of the options field must be a multiple of 32 if not, extra bits are added as padding IP Address The addressing of IP datagrams is an important issue, as applications require a way to deliver packets to specific machines and to identify the sender Each host machine under the Internet Protocol has a unique address, the IP address The IP address is a four-byte (32-bit) address, which is usually expressed in dotted decimal format (eg, 19216806) Although a physical address will normally be issued to a machine, once outside the local network in which it resides, the physical address is not very useful Even if somehow every machine could be located by its physical address, if the address changed for any.

Figure 34-5: rdt21 recevier Figures 34-4 and 34-5 show the FSM description for rdt21, our fixed version of rdt20 The rdt21 sender and receiver FSM's each now have twice as many states as before This is because the protocol state must now reflect whether the packet currently being sent (by the sender) or expected (at the receiver) should have a sequence number of 0 or 1 Note that the actions in those states where a 0-numbered packet is being sent or expected are mirror images of those where a 1-numbered packet is being sent or expected; the only differences have to do with the handling of the sequence number Protocol rdt21 uses both positive and negative acknowledgements from the receiver to the sender A negative acknowledgement is sent whenever a corrupted packet, or an out of order packet, is received We can accomplish the same effect as a NAK if instead of sending a NAK, we instead send an ACK for the last correctly received packet A sender that receives two ACKs for the same packet (ie, receives duplicate ACKs) knows that the recevier did not correctly receive the packet following the packet that is being ACKed twice Many TCP implementations use the receipt of so-called "triple duplicate ACKs" (three ACK packets all ACK'ing the same packet) to trigger a retransmission at the sender Our NAK-free reliable data ransfer protocol for a channel with bit errors is rdt22, shown in Figure 34-6 and 34-7.

While ICMP is a useful protocol to be aware of, only a few network applications will make use of it, as its functionality is limited o diagnostic and error notification One of the most well known applications that use ICMP is the ping network application, used to determine if a host is active and what the delay is between sending a packet and receiving a response NOTE Java does not support ICMP access, so ping applications are impossible to write in Java Some Java textbooks include a UDP example called ping, but it is important to remember that this is not the real ping application The only way to write a true ping application in Java would be to use the Java Native Interface (JNI) to access native code; such a discussion is beyond the scope of this book 1513 Transmission Control Protocol The Transmission Control Protocol (TCP) is a Layer 4 protocol (transport layer) that provides guaranteed delivery and ordering of bytes TCP uses the Internet Protocol to send TCP segments, which contain additional information that allows it to order packets and resend them if they go astray TCP also adds an extra layer of abstraction, by using a communications port A communications port is a numerical value (usually in the range 0 65,535) that can be used to distinguish one application or service from another An IP address can be thought of as the location of a block of apartments, and the port as the apartment number One host machine can have many applications connected to one or more ports An application could connect to a Web server running on a particular host, and also to an e-mail server to check for new mail Ports make all of this possible.

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rdist is almost always built into Unix systems, and versions are publicly available (one is available from the Free Software Foundation GNU web site at . Get in the habit of putting a checksum in your istributions so that you can use it for timestamps, content integrity checking, and debugging purposes. Sparse files wreak havoc with utilities that read files block by block. A sparse file is an efficiently laid out file with intentional holes in it. Around the holes, blocks are allocated at random points in the file; the holes appear where no blocks have been allocated. These holes read back as zeros, and can cause a file-oriented copy to grow tremendously in size. Database applications, even NIS or NIS+ systems that use DBM files, tend to create sparse files. If you re using Perl scripts that create and maintain DBM database files, or other tools that create index files based on block numbers, you probably have sparse files around and should be especially careful when copying them. Improperly copying sparse files is a common cause of suddenly and unexpectedly running out of disk space. Large files are becoming commonplace, and all utilities should know how to handle a 6GB log file or a transaction log that s greater than the default 32-bit file size limit of 2GB. Make sure all file transport products. Bar Code Drawer In .NET Using Barcode maker for ASP .Related: Codabar Generating C# , Codabar Generating ASP.NET , Create EAN-8 Excel

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Flag field Every PPP frame begins and ends with a 1 byte flag field with a value of 01111110 Address field The only possible value for this field is 11111111 Control Field The only possible value of this field is 00000011 Because both the address and control fields can currently take only a fixed value, one wonders why the fields are even defined in the firstplace The PPP specification [RFC 1622] states that other values "may be defined at a later time," although none have been defined to date Because these fields take fixed values, PPP allows the sender to simply not send the address and control bytes, thus saving two bytes of overhead in the PPP frame Protocol The protocol field tells the PPP receiver the upper layer protocol to which the received encapsulated data (ie, the contents of the PPP frame's info field) belongs On receipt of a PPP frame, the PPP receiver will check the frame for correctness and then pass the encapsulated data on to the appropriate protocol [RFC 1700] defines the 16-bit protocol codes used by PPP Of interest to us are the IP protocol (ie, the data encapsulated in the PPP frame is an IP datagram) which has a value of 21 hexadecimal, other network layer protocols such as Appletalk (29) and DECnet (27), the PPP link control protocol (c021 hexadecimal) that we discuss in detail in the following section, and the IP Control Protocol (8021) which is called by PPP when a link is first activated in order to configure the IP-level connection between the two routers on each end of the link (see below) Information This field contains the encapsulate packet (data) that is being sent by an upper layer protocol (eg, IP) over the PPP link The default maximum length of the information field is 1500 bytes, although this can be changed when the link is first configured, as discussed below Checksum The checksum field is sed to detect bit errors in a transmitted frame It uses either a two or four byte HDLC-standard cyclic redundancy code.

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