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ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network. It is available in a wide range of operating systems – including most embedded network administration software.
The ICMP header starts after the IPv4 header and is identified by its protocol number, 1. [6] All ICMP packets have an eight-byte header and variable-sized data section. The first four bytes of the header have fixed format, while the last four bytes depend on the type and code of the ICMP packet.
nslookup, used to query a DNS server for DNS data (deprecated on Unix systems in favour of host and dig; still the preferred tool on Microsoft Windows systems). vnStat, useful command to monitor network traffic from the console. vnstat allows to keep the traffic information in a log system to be analyzed by third party tools.
SNMP exposes management data in the form of variables on the managed systems organized in a management information base (MIB), which describes the system status and configuration. These variables can then be remotely queried (and, in some circumstances, manipulated) by managing applications.
The name is a play on the word ping, another computer network administration utility. Because ICMP can be used to identify the operating system of a remote machine, [1] [2] it is sometimes blocked. [3] [4] If ICMP is blocked, ping cannot be used to identify if the service is responding. Publicly available services must keep their relevant TCP ...
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The firewall can use these unique connection identifiers to know when to remove a session from the state table without waiting for a timeout. UDP is a connectionless protocol, [4] which means it does not send unique connection-related identifiers while communicating. Because of that, a session will only be removed from the state table after the ...
PathPing is a utility introduced with Windows NT that combines ping and traceroute functionality. MTR is an enhanced version of ICMP traceroute available for Unix-like and Windows systems. The various implementations of traceroute all rely on ICMP Time Exceeded (type 11) packets being sent to the source.