DATE: August 12, 1999


The ping command works much like a submarine sonar ping. The Lucent  PortMaster (TM) sends a packet called an 'ICMP Echo Request'. When that signal reaches its destination an 'ICMP Echo Reply' is sent back to the source of the signal. This verifies that packets can get to a host and back again. internet Control Message Protocol (ICMP) is the transport protocol used by ping (see RFC 792). See link: http://www.ietf.org/rfc/rfc0792.txt 

If the PortMaster does not receive an 'ICMP Echo Reply' to its 'ICMP Echo Request' then the PortMaster will continue to send 'ICMP Echo Request's once a second until an 'Echo Reply' has been received or until 10 'Echo Requests' have been sent. 

The ping command can also be used to test Domain Name Service (DNS) or be used to resolve a host name. If the ping command is given a host name for an argument instead of an IP address the PortMaster will attempt to resolve the host name by sending a DNS query to whatever DNS server is specified in the global settings. The resolution of that host name to an IP is shown. 


Command >ping [ip address, hostname]
ping            # terminates ping

NOTE: Ping with no arguments will terminate a ping.


Command> ping is alive

Command> ping lucent
lucent ( is alive