Utility by address

Header names have been capitalized, and may not appear exactly as transmitted by your browser. The command-line options of the ping utility and its output vary between the numerous implementations. The ping utility was written by Mike Muuss in December 1983 during his employment at the Ballistic Research Laboratory, now the US Army Research Laboratory. RFC 1122 utility by address that any host must process ICMP echo requests and issue echo replies in return.

However, as a security consideration, this is often disabled. The following is the output of running ping on Linux for sending five probes to the target host www. 56 data bytes 64 bytes from 93. 632 ms 64 bytes from 93.

726 ms 64 bytes from 93. 683 ms 64 bytes from 93. 674 ms 64 bytes from 93. 5 packets transmitted, 5 packets received, 0. In cases of no response from the target host, most implementations display either nothing or periodically print notifications about timing out.

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In case of error, the target host or an intermediate router sends back an ICMP error message, for example “host unreachable” or “TTL exceeded in transit”. Type of Service set to 0. However, the packet including IP and ICMP headers must be less than the maximum transmission unit of the network or risk being fragmented. The Identifier and Sequence Number can be used by the client to match the reply with the request that caused the reply. In practice, most Linux systems use a unique identifier for every ping process, and sequence number is an increasing number within that process. Windows uses a fixed identifier, which varies between Windows versions, and a sequence number that is only reset at boot time. The identifier and sequence number can be used by the client to associate each echo request with its reply.

5: ICMP echo request, id 1, seq 38, length 40 0x0000: 4500 003c 3aff 0000 8001 5c55 c0a8 9216 E. The payload may also include a magic packet for the Wake-on-LAN protocol, but the minimum payload in that case is longer than shown. The Echo Request typically does not receive any reply if the host was sleeping in hibernation state, but the host still wakes up from sleep state if its interface is configured to accept wakeup requests. The “flood” ping option exists in many implementations, sending requests as fast as possible in an attempt to determine the response of the network under high-load conditions. Ping has been considered a security risk because merely acknowledging a host’s presence turns it into a potential target. Host discovery, scanning or ping sweep is a feature of network scanning tools such as nmap, working by utilising ICMP echo packets.

The Story of the PING Program”. Archived from the original on 8 September 2010. I named it after the sound that a sonar makes, inspired by the whole principle of echo-location. RFC 1122 – Requirements for Internet Hosts — Communication Layers”. RFC 792 – Internet Control Message Protocol”. Accurate Manipulation of Delay-based Internet Geolocation.

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