Hello Friends, In this blog post I am going to let you know about ICMP protocols, message types that are associated with ICMP and various functions associated with the ICMP protocol.
Internet control message protocol has various types of message, which are as follows –
- Destination unreachable message
- Time exceeded message
- Parameter problem message
- Source quench message
- Redirect Message
- Echo and echo reply message
- Time Stamp and timestamp reply message
- Address mask request and address mask reply message.
ICMP provides a means for transferring a message from routers and other hosts to a host. ICMP provides feedback about problems in the communication environment.
Examples of its use are when a datagram cannot reach its destination, when the router does not have the buffering capacity to forward a datagram, and when the router can direct the station to send traffic on a shorter route.
An ICMP message is sent in response to a datagram, either by a router along the datagram’s path or by the intended destination host.
An ICMP message is constructed and then passed down to IP, which encapsulates the message with an IP header and then transmits the resulting datagram in the usual fashion. Because ICMP messages are transmitted in IP datagrams, their delivery is not guaranteed and their use can not be considered reliable.
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