ping(1M)

If host is a multicast address, send multicast datagrams from the interface with the local IP address specified by address in ``dot'' notation (see inet(3N)). If the -i option is not specified, multicast datagrams are sent from the default interface, which is determined by the route configuration.

Insert an IP Record Route option in outgoing packets, summarizing routes taken when the command terminates.

It may not be possible to get the round-trip path if some hosts on the route taken do not implement the IP Record Route option. A maximum of 9 Internet addresses can be recorded due to the maximum length of the IP option area.

The new Path MTU information is displayed when a ICMP "Datagram Too Big" message is received from a gateway. The -p option must be used in conjunction with a large packetsize and with the -v option.

Bypass the normal routing tables and send directly to a host on an attached network. If the host is not on a directly-connected network, an error is returned. This option can be used to ping the local system through an interface that has no route through it, such as after the interface was dropped by gated (see gated(1M)).

If host is a multicast address, set the time-to-live field in the multicast datagram to ttl. This controls the scope of the multicast datagrams by specifying the maximum number of external systems through which the datagram can be forwarded.

If ttl is zero, the datagram is restricted to the local system. If ttl is one, the datagram is restricted to systems that have an interface on the network directly connected to the interface specified by the -i option. If ttl is two, the datagram can forwarded through at most one multicast router; and so forth. Range: zero to 255. The default value is 1.

Verbose output. Show ICMP packets other than Echo Responses that are received.

Destination to which the ICMP Echo Requests are sent. host can be a hostname or an Internet address. All symbolic names specified for host are looked up by using gethostbyname() (see gethostent(3N)). If host is an Internet address, it must be in "dot" notation (see inet(3N)).

If a system does not respond as expected, the route might be configured incorrectly on the local or remote system or on an intermediate gateway, or there might be some other network failure. Normally, host is the address assigned to a local or remote network interface.

If host is a broadcast address, all systems that receive the broadcast should respond. Normally, these are only systems that have a network interface on the same network as the local interface sending the ICMP Echo Request.

If host is a multicast address, only systems that have joined the multicast group should respond. These may be distant systems if the -t option is specified, and there is a multicast router on the network directly connected to the interface specified by the -i option.

The size of the transmitted packet, in bytes. By default (when packet-size is not specified), the size of transmitted packets is 64 bytes. The minimum value allowed for packet-size is 8 bytes, and the maximum is 4095 bytes. If packet-size is smaller than 16 bytes, there is not enough room for timing information. In that case, the round-trip times are not displayed.

The number of packets ping will transmit before terminating. Range: zero to 2147483647. The default is zero, in which case ping sends packets until interrupted.