What is the Internet check report report?
Internet Control Message (ICMP) is a tool used to report errors and diagnostic purposes in computer networks. ICMP is part of the Internet Protocol (IP) and consists of predefined messages with different purposes. Most aspects of Internet check reports are unnoticed by end -users, but several network tools such as Traceeroute and Ping are relied on ICMP messages for their functionality.
In the core of the Internet and smaller computer networks, the collection of protocols known as the IP set. These protocols specify formats for messages exchanged between network devices and set rules for how these messages are sent and accepted. The protocols are also layered, each layer relying on because it is below it. ICMP is part of the second highest layer, the Internet layer. This layer includes a well -known Internet protocol responsible for the transfer of individual data groups called packets, in one or more networks.
ICMP is used to sendError messages or diagnostic information between devices or hosts using an Internet protocol. ICMP messages are predefined and can be referred to a name or type number. Most of these messages are designed for different types of errors. For example, if a particular host cannot be achieved, an ICMP message is often generated, indicating a specific problem that prevents data from delivery. If the packets are damaged, other types of messages are sent or if the router or host is overloaded in the network.
The maximum packet size is not predefined, but dictated by the maximum transmission unit (MTU) of a particular network connection. Different links may have different MTU, but the packet must be smaller than the smallest MTU along the path to complete their path. Technique known as Path MTU Discovery (PMTUD) uses ICMP messages to warn the sender when packets too large for KONEWS SEGMENT OF THE WAY.
related protocol known as ICMP Router Discovery Protocol (IRDP) can facilitate the automatic host network configuration that supports it. IRDP uses two types of reports on Internet control reports to report and discover nearby routers, ie hosts that combine two or more networks. The IRDP router will regularly broadcast the ICMP Router advertising report to announce its presence to the hosts. The hosts can also send a message about the application for all routers in the area to identify themselves.
Some popular network tools also rely on the Internet control report protocol. One tool, traceroute, uses the ICMP message generated when the packet has expired or has exceeded its "time for life" (TTL). By adjusting the intentionally low TTL for the packet, the Traceroute message will receive an ICMP message exceeded from the last router that the packet reached before expired. Repetition of this process and increasing ttlhodnoShe will theoretically generate a list of all host packets.
6 Unfortunately, ping can also be abused in the so -called "Smurf attack" when the hacker sends echo requests with falsified information of the sender, which then corresponds to many other machines. This can take over the network to the extent that no legitimate packets can go through, the situation known as the rejection of the service.