HP-UX Reference (11i v1 00/12) - 1M System Administration Commands N-Z (vol 4)

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STANDARD Printed by: Nora Chuang [nchuang] STANDARD
/build/1111/BRICK/man1m/naaagt.1m
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p
ping(1M) ping(1M)
NAME
ping - send ICMP Echo Request packets to network host
SYNOPSIS
ping [-oprv][-i address][-t ttl] host [-n count]
ping [-oprv][-i address][-t ttl] host packet-size [[-n] count]
DESCRIPTION
The ping command sends ICMP Echo Request (ECHO_REQUEST) packets to host once per second. Each
packet that is echoed back via an ICMP Echo Response packet is written to the standard output, including
round-trip time.
ICMP Echo Request datagrams ("pings") have an IP and ICMP header, followed by a struct timeval
(see gettimeofday(2)) and an arbitrary number of "pad" bytes used to fill out the packet. The default
datagram length is 64 bytes, but this can be changed by using the packet-size option.
Options
The following options and parameters are recognized by
ping:
-i address 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.
-o 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.
-p 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 pack-
etsize and with the
-v 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-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)).
-t ttl 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.
-v Verbose output. Show ICMP packets other than Echo Responses that are received.
host 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 mul-
ticast router on the network directly connected to the interface specified by the -i
HP-UX Release 11i: December 2000 − 1 − Section 1M−−647
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