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The IP header contains approximately 15 unique fields. The Version field identifies the version of IP that is being used to encode the packet (IPv4 vs. IP v6, for example). The Internet Header Length (IHL) field identifies the length of the header in 32-bit words. The maximum value of this field is 15, which means that the IP header has a maximum length of 60 octets. The Type of Service (TOS) field gives the transmitting system the ability to request different classes of service for the packets that it transmits into the network. The TOS field is not typically supported in IPv4 but can be used to specify a service priority (0 7) or route optimization. The Total Length field indicates the length (in octets) of the entire packet, including both the header and the data within the packet. The maximum size of an IP packet is 64 KB (OK, 65,535 bytes). When a packet is broken into smaller chunks (a process called fragmentation) during transmission, the Identification field is used by the transmitting host to ensure that all of the fragments from a single message can be reassociated at the receiving end, to ensure message reassembly. The Flags also play a role in fragmentation and reassembly. The first bit is referred to as the More Fragments (MF) bit and is used to indicate to the receiving host that the last fragment of a packet has been received, so that the receiver can reassemble the packet. The second bit is the Don t Fragment (DF) bit, which prevents packet fragmentation (for delay sensitive applications, for example). The third bit is unused and is always set to 0.

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alize what type of investor you are and how much risk you can stomach in the way of investment losses. Make sure that you understand the risks involved in the asset in which you are investing. If the odds aren t in your favor or the extra return isn t sufficient to compensate you for the additional risk, take a pass and find an investment with more favorable risk/return characteristics. We always require an expected margin of safety before buying a stock. We recommend that you do likewise.

The Fragment Offset field indicates the relative position of this particular fragment in the original packet that was broken up for transmission. The first packet of a fragmented message will carry an offset value of 0, while subsequent fragments will indicate the offset in multiples of 8 bytes. Makes sense, no I love this field. A message is fragmented into a stream of packets and the packets are all sent on their merry way to the destination system. Somewhere along the way packet number 11 decides to take a detour and ends up in a routing loop on the far side of the world, trying in vain to reach its destination. To prevent this packet from living forever on the Internet, IP includes a Time-to-Live (TTL) field. This configurable field has a value between 0 and 255 and indicates the maximum number of hops that this packet is allowed to make before it is discarded by the network. Every time the packet enters a router, the router decrements the TTL value by one; when it reaches zero, the packet is discarded and the receiving device will ultimately invoke error control to ask for a resend. The Protocol field indicates the nature of the higher layer protocol that is carried within the packet. Encoded options include values for ICMP (1), TCP (6), UDP (17), or OSPF (89). The Header Checksum field is similar to a Frame-Check Sequence in HDLC and is used to ensure that the received IP header is free of errors. Keep in mind that IP is a connectionless protocol: This error check does not check the packet; it only checks the header. When transmitting packets it is always a good idea to have a source address and a destination address. You can figure out what they are for.

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As Figure 7-38 shows, IP addresses are 32-bits long. They are typically written as a sequence of four numbers, which represent the decimal value of each of the address bytes. These numbers are separated by periods ( dots in telecom parlance), and the notation is referred to as dotted decimal notation. A typical address might be 168.152.20.10. These numbers are hierarchical; the hierarchy is described in the section that follows. IP addresses are divided into two subfields. The Network Identifier (NET_ID) subfield identifies the subnetwork that is connected to the

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