INTRODUCTION TO PING.

INTRODUCTION TO PING.

Ping is a common and initial step for troubleshooting the problem in networking world. Ping tool tests TCP/IP network connectivity. It sends ICMP echo request messages to the host and expecting a reply. The destination host has to send a reply back to the sending host within a predetermined time. Ping sends a packet of 64 bytes (56=data+8=header). Echo request are send approximately after one  second. It is also used to test the network interface card.

It gives us the following information.

    • Remote host is alive or dead.
    • Round trip time (time from sending to receive packet).
    • Packet loss percentage.

Capture

(Note: ping tool test the reachability at the IP layer but the firewall and access list can be a blocker)

 

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