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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 to etect 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.

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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Paint Barcode In Java Using Barcode maker for Java Control . UCC - 12 Encoder In Java Using Barcode generation for .be overkill A more efficient approach using so-called message digests can accomplish these two goals without full message encryption A message digest is in many ways like a checksum Message digest lgorithms take a message, m, of arbitrary length and compute a fixed length "fingerprint" of the data known as a message digest, H(m) The message digest protects the data in the sense that if m is changed to m' (either maliciously or by accident) then H(m), computed for the original data (and transmitted with that data), will not match the H(m) computed over the changed data While the message digest provides for data integrity, how does it help with signing the message m The goal here is that rather than having Bob digitally sign (encrypt) the entire message by computing dB(m), he should be able to sign just the message digest by compting dB (H(m)) That is, having m and dB(H(m)) together (note that m is not typically encrypted) should be "just as good as" having a signed complete message, dB(m); this means that m and dB(H(m)) together should be non-forgible, verifiable, and non-repudiable Nonforgible will require that the message digest algorithm that computes the message digest have some special properties, as we will see below.Related: EAN-13 Generating C# , ASP.NET Interleaved 2 of 5 Generator , UPC-E Generation .NET

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What are the security implications In essence, when you connect via VPN, you connect via a private link to the network If a vulnerability exists on that VPN network, your client machine is now open to that vulnerability The reverse argument is also valid When you offer a VPN service you need to ensure that your security is airtight As soon as someone VPNs in to your network, it s as if they are sitting at a cubicle inside your building They are virtually plugged in and can access anything that entails Clients with a virus or vulnerability connecting via VPN can spread it over your network as if they were directly connected That is why, as part of your VPN solution, you need to check the health of VPN clients You need to protect your network If many of the VPN connections are to be made from users home computers, you could have a real problem A home computer is far less likely to have up-to-date patches and virus de nitions than your of ce equipment, and probably sees far more colorful web sites thanks to little Billy exposing it to more attacks Because of these security concerns and the importance of the data going over the VPN tunnel, three areas of functionality are offered via VPN solutions The first is encapsulation, as discussed earlier Encapsulation wraps any data for transmission over the VPN with information needed for its routing The form of this encapsulation varies depending on the type of VPN tunnel you use The next area of functionality is authentication and this is vital You don t want just anyone connecting via your VPN, so you need to be certain whom you are authenticating and maintain this checking in case a VPN session is hijacked over the Internet There are various options available for authentication Point-to-Point Protocol (PPP) is the protocol most commonly used It performs a user authentication at the start to con rm that a user is who he says he is, using an authentication protocol such as Password Authentication Protocol (PAP) or Extensible Authentication Protocol (EAP) Another option is mutual authentication, which is where the VPN server also con rms its identity to the client This avoids the possibility of a server masquerading as the VPN server, harvesting credentials, and potentially giving false information You might have heard of PPP from a dial-up perspective in which it sends data over phone lines and has largely replaced Serial Line Internet Protocol (SLIP) Other types of authentication are possible at a computer-level using Internet Key Exchange (IKE), which uses certi cates or some shared key for mutual authentication A similar approach is data origin authentication in which a cryptographic checksum based on a shared encryption key (shared between the VPN client and server) is added to the data being sent, proving the data s integrity.

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