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- PING User Commands PING
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- NNAAMMEE
- ping - send ICMP ECHO_REQUEST packets to network hosts
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- SSYYNNOOPPSSIISS
- ppiinngg [ --rr ] [ --vv ] _h_o_s_t [ _p_a_c_k_e_t_s_i_z_e ] [ _c_o_u_n_t ]
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- DDEESSCCRRIIPPTTIIOONN
- The DARPA Internet is a large and complex aggregation of
- network hardware, connected together by gateways. Tracking
- a single-point hardware or software failure can often be
- difficult. _P_i_n_g utilizes the ICMP protocol's mandatory
- ECHO_REQUEST datagram to elicit an ICMP ECHO_RESPONSE from a
- host or gateway. ECHO_REQUEST datagrams (``pings'') have an
- IP and ICMP header, followed by a ssttrruucctt ttiimmeevvaall, and then
- an arbitrary number of ``pad'' bytes used to fill out the
- packet. Default datagram length is 64 bytes, but this may
- be changed using the command-line option. Other options
- are:
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- --rr 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. This
- option can be used to ping a local host through an
- interface that has no route through it (e.g., after the
- interface was dropped by _r_o_u_t_e_d(8C)).
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- --vv Verbose output. ICMP packets other than ECHO RESPONSE
- that are received are listed.
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- When using _p_i_n_g for fault isolation, it should first be run
- on the local host, to verify that the local network inter-
- face is up and running. Then, hosts and gateways further
- and further away should be ``pinged''. _P_i_n_g sends one
- datagram per second, and prints one line of output for every
- ECHO_RESPONSE returned. No output is produced if there is
- no response. If an optional _c_o_u_n_t is given, only that
- number of requests is sent. Round-trip times and packet
- loss statistics are computed. When all responses have been
- received or the program times out (with a _c_o_u_n_t specified),
- or if the program is terminated with a SIGINT, a brief sum-
- mary is displayed.
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- This program is intended for use in network testing, meas-
- urement and management. It should be used primarily for
- manual fault isolation. Because of the load it could impose
- on the network, it is unwise to use _p_i_n_g during normal
- operations or from automated scripts.
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- AAUUTTHHOORR
- Mike Muuss
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- Sprite v1.0 May 23, 1986 1
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- PING User Commands PING
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- SSEEEE AALLSSOO
- netstat(1), ifconfig(8C)
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- Sprite v1.0 May 23, 1986 2
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