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mertyildiran
Asked: 2015-01-30 13:18:51 +0800 CST

Why does ping -f act like this?

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ping -f -s 65500 ip_address

I'm using this command to try a sample DoS attack.

Generally cursor is progressing but sometimes cursor is blinking like this:

enter image description here

Generally:

enter image description here

What is the meaning of this?

Is there any better command than this one? Maybe a command specialized for HTTP?

ping -f -s 65500 ip_address
ping

1 Answers

  1. Best Answer

    1. from man ping:

       -f     Flood  ping.  For  every  ECHO_REQUEST  sent  a  period  ``.'' is printed, while for ever ECHO_REPLY
          received a backspace is printed.  This provides a rapid  display  of  how  many  packets  are  being
          dropped.   If  interval  is  not given, it sets interval to zero and outputs packets as fast as they
          come back or one hundred times per second, whichever is more.  Only  the  super-user  may  use  this
          option with zero interval.

    So, your first screenshot says that for every packet sent a reply from the server has been received.

    Your second screenshot says that a few packets have been lost since you started the command.

    2. There are a few tools for benchmarking/load-testing HTTP servers, for example ab

    3. Performing Denial of Service attacks on somebody else's servers is illegal in many jurisdictions. I'm sure you're talking about stress-testing your own web servers and I suggest you to edit your question to reflect that. Most Linux tools for benchmarking and stress-testing will work in Ubuntu, there's no need for Ubuntu-specific documentation.

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