ICMP messages ICMP messages The Destination Unreachable message is an ICMP message which is generated by the router to inform the client that the destination host is unreachable, unless the datagram has a multicast address. Reasons for this message may include the physical connection to the host does not exist (distance is infinite), the indicated protocol or port is not active, or the data must be fragmented but the 'don't fragment' flag is on. ...more on Wikipedia about "ICMP Destination Unreachable"
The Echo Reply is an ICMP message generated in response to an ICMP Echo Request message, and is mandatory for all hosts and routers. ...more on Wikipedia about "ICMP Echo Reply"
The Echo Request is an ICMP message which sends a packet of data to the host and expects that data to be sent in return in a Echo Reply. The host must respond to all Echo Requests with an Echo Reply containing the exact data received in the request message. ...more on Wikipedia about "ICMP Echo Request"
The Redirect Message is an ICMP message which informs a host to redirect its routing information (to send packets on an alternate route). If the host tries to send data through a router (R1) and then another router (R2) to reach the host, and a direct path from the host to R2 is available, the redirect will inform the host of such a route. The router will still send the original datagram to the intended destination. However, if the datagram contains routing information, this message will not be sent even if a better route is available. Please note that redirects are only sent by gateways. ...more on Wikipedia about "ICMP Redirect Message"
The Source Quench is an ICMP message which requests the sender to decrease the traffic rate of messages to a router or host. This message may be generated if the router or host does not have sufficient buffer space to process the request, or may occur if the router or host's buffer is approaching its limit. ...more on Wikipedia about "ICMP Source Quench"
The Time Exceeded Message is an ICMP message which is generated by a gateway to inform the source of a datagram that the datagram has been discarded due to the time to live field reaching zero. A time exceeded message may also be sent by a host if it fails to reasemble a fragmented datagram within its time limit. ...more on Wikipedia about "ICMP Time Exceeded"
The Timestamp is an ICMP message which is used for time synchronization. It consists of the originating timestamp. ...more on Wikipedia about "ICMP Timestamp"
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The Timestamp Reply is an ICMP message which replys to a Timestamp message. It consists of the originating timestamp sent by the sender of the Timestamp as well as a receive timestamp and a transmit timestamp. ...more on Wikipedia about "Timestamp Reply"
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