The 1 st packet is sent by source machine is ICMP echo request and if you look by the given below image, you will observe highlighted text is showing ICMP query code: type 8 echo ping request. Total numbers of packet captured are 8, 4 for request and 4 for reply between the source and destination machine. Look over the sequence of packet transfer between source and destination captured through Wireshark. Total packets are 8, 4 packets of the request and 4 of reply.TTL = 128 which means host machine is windows system.The same size of payload received by source machine is 32 bytes from Destination machine ( reply).The default size of payload sent by source machine is 32 bytes ( request).ping 192.168.0.105įrom the given below image you can see a reply from the host now notice a few more things as given below: Here we are going to test how ping command helps in identifying an alive host by Pinging host IP.
The target host responds with an echo Reply which means the target host is alive. Query: The query messages are the information we get from a router or another destination host.įor example, given below message types are some ICMP query codes:Ī ping command sends an ICMP echo request to the target host. ICMP message contains two types of codes i.e. ICMP Message code & Packet description with Wireshark ICMP packet at Data Link layer Ethernet header According to MTU the size of the ICMP packet cannot be greater than 1500 bytes. network layer protocol used by the ping command for sending a message through ICMP payload which is encapsulated with IP Header Packet. It is used by network devices, including routers, to send error messages and operational information which indicates that a requested service is not available or that a host or router could not be reached. The Internet Control Message Protocol ( ICMP) is a supporting protocol in the Internet protocol suite.
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