If you're testing in an IPv6 network you'll need to use the ping6 utility. One thing to note about the output above and the ping utility, in general, is that ping is strictly an IPv4 tool. In this case, six packets were sent with an average RTT of 14ms. From the output, you can see the IP address being contacted, the sequence number of each packet sent, and the round-trip time. The example above shows a ping session to. Ping is an excellent first step for identifying whether or not a destination is 'alive.' Keep in mind, however, that some networks block ICMP traffic, so a failure to respond is not a guarantee that the destination is offline. This summary tells you how many packets were sent and received, how much packet loss there was, and statistics on the RTT of the traffic. When the ping command completes, it displays a summary of the ping session. Note: ICMP is typically a low-priority protocol, meaning that the ICMP RTT is not guaranteed to match the RTT for a higher-priority protocol such as TCP. The RTT can be an indicator of the latency between the source and the destination. Once the message returns to the source, the ping command displays a success message as well as the Round Trip Time (RTT). If the destination is available and is allowed to respond, then it replies with an ICMP Echo Reply. When you issue a ping command, the source sends an ICMP Echo Request to the destination.

Ping uses two ICMP message types: type 8 (Echo Request) and type 0 (Echo Reply). ICMP was designed to be an error reporting protocol and has a wide variety of uses that we won't go into here.

It does this using a protocol known as ICMP, or Internet Control Message Protocol. If the host is, in fact, there, ping returns a 'yup, I'm here' message. Simply put, ping sends an 'are you there?' message to a remote host. The ping command is one of the most well-known tools available.

Linux System Administration Skills Assessment.

Download Now: Basic Linux Commands Cheat Sheet.

Advanced Linux Commands Cheat Sheet for Developers.

Echo jason walker topic