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What does "ping" really do?

 
 
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foundThroughAdminSig
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PostPosted: Tue Nov 30, 2004 3:05 am    Post subject: What does "ping" really do? Reply with quote

What does "ping" really do? Does it talk to DNS server or it talks to the server that actually hosts a domain?
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vigo
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PostPosted: Tue Nov 30, 2004 9:34 am    Post subject: From memory... Reply with quote

Ping looks up the IP address of the server (unless given) and sends it a IMCP packet on port ???? - basically that's network talk for "hello".

If you're trying to work out if a server is dead it is helpful to have the IP address, because with many servers (and most shared host servers) the DNS is on the same machine as the other services so ping won't be able to work out the IP address.

Code:
Syntax:
ping www.amazon.oc.uk      (uses DNS to find www.amazon.co.uk and send's it a ping)
ping 207.171.170.19               (pings this machine directly)
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Mike Dempsey
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PostPosted: Tue Nov 30, 2004 11:20 am    Post subject: Reply with quote

Ping is like sonar for the net.
you send a packet to a computer and wait for an response.
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