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The IP address of the source of the IP datagram. The IP address of the destination of the IP datagram.
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Destination IP Address
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Identification Used to identify a specific IP datagram and all fragments of a specific IP
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datagram if fragmentation occurs.
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Protocol Informs IP at the destination host whether to pass the packet up to TCP, User
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Datagram Protocol (UDP), ICMP, or other protocols.
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Checksum A simple mathematical computation used to verify the integrity of the IP header. If the IP header does not match the checksum, the receiving host will disregard the packet. This checksum does not include any information outside the IP header.
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19:
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Implementing TCP/IP Security
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Time To Live (TTL) Designates the number of networks on which the datagram is allowed to travel before being discarded by a router. The TTL is set by the sending host and is used to prevent packets from endlessly circulating on an IP network. When forwarding an IP packet, routers decrease the TTL by at least one.
If a router receives an IP packet that is too large for the network to which the packet is being forwarded, IP fragments the original packet into smaller packets that fit on the downstream network. When the packets arrive at their final destination, IP on the destination host reassembles the fragments into the original payload. This process is referred to as fragmentation and reassembly. Fragmentation can occur in environments that have a mix of networking technologies, such as Ethernet and Token Ring. The fragmentation and reassembly works as follows:
Fragmentation And Reassembly
1. 2.
When an IP packet is sent, the sending host places a unique value in the Identification field. The IP packet is received at the router. If the router determines that the Maximum Transmission Unit (MTU) of the network onto which the packet is to be forwarded is smaller than the size of the IP packet, the router fragments the original IP payload into multiple packets, each of which is smaller than the receiving network s MTU size. Each fragment is sent with its own IP header that contains the following:
The original Identification field, which identifies all fragments that belong together. The More Fragments flag, which indicates that other fragments follow. The More Fragments flag is not set on the last fragment because no other fragments follow it. The Fragment Offset field, which indicates the position of the fragment relative to the original IP payload.
When the fragments are received by the destination host, they are identified by the Identification field as belonging together. The Fragment Offset field is then used to reassemble the fragments into the original IP payload.
Address Resolution Protocol performs IP address to MAC address resolution for outgoing packets. As each outgoing addressed IP datagram is encapsulated in a frame, source and destination MAC addresses must be added. Determining the destination MAC address for each frame is the responsibility of ARP. ARP is defined in RFC 826.
Part III:
Security
ICMP
Internet Control Message Protocol provides troubleshooting facilities and error reporting for packets that are undeliverable. For example, if IP is unable to deliver a packet to the destination host, ICMP sends a Destination Unreachable message to the source host. Table 19-1 shows the most common ICMP messages.
Table 19-1 Message Echo Request Echo Reply Redirect Source Quench
Common ICMP Messages
Description Troubleshooting message used to check IP connectivity to a desired host. The Ping utility sends ICMP Echo Request messages. Response to an ICMP Echo Request. Sent by a router to inform a sending host of a better route to a destination IP address. Sent by a router to inform a sending host that its IP datagrams are being dropped because of congestion at the router. The sending host then lowers its transmission rate. Sent by a router or the destination host to inform the sending host that the datagram cannot be delivered.
Destination Unreachable
When the result of an ICMP request is a Destination Unreachable message, a specific message is returned to the requestor detailing why the Destination Unreachable ICMP message was sent. Table 19-2 describes the most common of these messages.
Table 19-2
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