ping : Java Glossary

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ping

Ping is a common unix and Windows utility. You give it a domain name or IP (Internet Protocol) and it tells you the corresponding IP and whether that site is up or not. It is the smaller brother of TraceRt that tells you about all the hops necessary to reach that destination. The other function of ping it to determine how long it takes to send a packet and get a response. You might ping several alternate sources and use the one with the shortest ping. Napster automatically displays ping times for all potential downloads.

According to Wayne Kovsky, ping implementations rely on ICMP (Internet Control Message Protocol), which is a low-level protocol designed for network administration and not supported in Java. Java supports the higher level datagrams and TCP/IP (Transmission Control Protocol/Internet Protocol) streams. It does not use a TCP/IP port.

But, you can simulate the functionality of ping, by opening a socket to the host and sending a message to some known port. This technique (with sample source code) is described in Peter van der Linden’s book. It will probably be sufficient for your requirements, even though it is not a real ping. Port 7, the echo port is commonly used.

You can use ping to estimate how many of your packets are getting through the first time.

rem Ping continuously with 1000 byte packets.

ping somewebsite.com  -t -1 1000

rem results will tell you of any errors, sorry no accumulated stats.

If ping fails, it might simply mean the server does not support the ping protocol. Many servers are dropping support to avoid a DOS (Denial of Service attack).

recommend book⇒Just Java 2, sixth edition

Peter van der Linden

978-0-13-148211-1

paperback

publisher

Prentice Hall

978-0-13-700990-9

eBook

published

2004-07-01

978-0-13-493982-7

audio

B001MDC0FW

kindle

Covers Java 5 aka 1.5. Peter has a sense of humour and breaks the drudgery of reading with a funny story at the end of each chapter. He explains through simple examples. This is a book you can sit down and read and not fall asleep. I helped edit and proofread the chapters on enums and genericity. This is good introduction that won’t overwhelm you.

Online bookstores carrying Just Java 2, sixth edition
	abe books anz	abe books.ca
	abe books.de	amazon.ca
	amazon.de	Chapters Indigo
	amazon.es	Chapters Indigo eBooks
	iberlibro.com	abe books.com
	abe books.fr	amazon.com
	amazon.fr	Barnes & Noble
	abe books.it	Nook at Barnes & Noble
	amazon.it	Kobo
	junglee.com	Google play
	abe books.co.uk	O’Reilly Safari
	amazon.co.uk	Powells
	other stores

Greyed out stores probably do not have the item in stock. Try looking for it with a bookfinder.

To avoid denial of service attacks, some sites ignore pings. In that case you must use tracert. It takes much longer and so is less useful for hassling a server.

Ping-like network analyis tools
tracert

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