Network Appliance(TM)

Manual Pages

Table of Contents

NAME

ping - send ICMP ECHO_REQUEST packets to network hosts

SYNOPSIS

ping [ -s ] [ -Rrv ] host [ packetsize [ count ] ]

DESCRIPTION

ping uses the ICMP protocol's mandatory ECHO_REQUEST datagram to elicit an ICMP ECHO_RESPONSE from the specified host, or gateway. ECHO_REQUEST datagrams have an IP and ICMP header, followed by a struct timeval and then an arbitrary number of bytes used to fill out the packet. If host responds, ping prints "host is alive." Otherwise, ping will resend the ECHO_REQUEST once a second. If the host does not respond after count seconds (default value is 20), ping will print "no answer from host."

When the -s flag is specified, ping sends one datagram per second and prints one line of output for every ECHO_RESPONSE that it receives. ping computes the round-trip times and packet loss statistics. When the count number of packets have been sent or if the command is terminated with a ^C, the summary statistics is displayed. The default packetsize is 56, which translates into 64 ICMP bytes when combined with the 8 bytes of ICMP header.

OPTIONS

-R Record route. Includes the RECORD_ROUTE option in the ECHO_REQUEST packet and displays the route buffer on returned packets. Note that the IP header is only large enough for nine such routes. Many hosts ignore or discard this option.

-r Bypass the normal routing tables and send directly to a host on an attached network. If the host is not on a directly-attached network, an error is returned.

-s Send one datagram every second.

-v Verbose output. ICMP packets other than ECHO_RESPONSE that are received are listed.

SEE ALSO

na_ifconfig(1), na_netstat(1)

Table of Contents