ICMPs generate different kinds of useful messages, including destination unreachable, Echo Request and Response Redirect, Time exceeded, and Router Advertisement and Router Soloists. If an ICMP message can not be saved, there is a second is created. It is an endless stream of ICMP messages are avoided.
When a message ICMP destination-unreachable is sent by a router, this means that the router is not able to send packets to the final destination. Router then throw the original package. There are two reasons why an unreachable destination will be. More broadly, the host resource specified a nonexistent address. Less commonly, the router does not have a route to the destination.
Destination-unreachable messages consists of four basic types: network unreachable, host unreachable, protocol unreachable, and port unreachable. Network-unreachable messages usually mean that a failure has occurred in the course or treatment of a package.
Host-unreachable messages usually indicate liver failure, such as incorrect subnet mask. Protocol-unreachable messages generally mean that the destination does not support upper layer protocol packets.
Port-unreachable messages means that the TCP socket or port is not available. An ICMP echo request message, which was created ping command is sent from a host is required to achieve test on a job site. ICMP echo-reply message indicates that the node can be achieved successfully. ICMP Redirect message is sent from router to source host to stimulate more efficient routing.
The router still forwards the original packet to the destination. ICMP redirects allow host routing tables remain small, it is necessary to address only a router to know, even if the router is not the best way. Even after an ICMP Redirect message, some devices can continue with the road less efficient...
When a message ICMP destination-unreachable is sent by a router, this means that the router is not able to send packets to the final destination. Router then throw the original package. There are two reasons why an unreachable destination will be. More broadly, the host resource specified a nonexistent address. Less commonly, the router does not have a route to the destination.
Destination-unreachable messages consists of four basic types: network unreachable, host unreachable, protocol unreachable, and port unreachable. Network-unreachable messages usually mean that a failure has occurred in the course or treatment of a package.
Host-unreachable messages usually indicate liver failure, such as incorrect subnet mask. Protocol-unreachable messages generally mean that the destination does not support upper layer protocol packets.
Port-unreachable messages means that the TCP socket or port is not available. An ICMP echo request message, which was created ping command is sent from a host is required to achieve test on a job site. ICMP echo-reply message indicates that the node can be achieved successfully. ICMP Redirect message is sent from router to source host to stimulate more efficient routing.
The router still forwards the original packet to the destination. ICMP redirects allow host routing tables remain small, it is necessary to address only a router to know, even if the router is not the best way. Even after an ICMP Redirect message, some devices can continue with the road less efficient...
