[Gllug] Pinging a machine that is down

[Alain Williams]

On Mon, Jan 11, 2010 at 10:43:31AM -0500, Andrew Farnsworth wrote:
> On Sat Jan  9 12:46 , Alain Williams <addw at phcomp.co.uk> sent:
> 
> >I have just rebooted a customer's machine (to run a new kernel).
> >
> >I left a ping running so that I could login once it had rebooted.
> >
> >I noticed that the ''Destination Host Unreachable'' appear in 3s with the one before
> >the first of the 3 missing. Eg in the sequence below 100,101,102 all appear at once,
> >there is then a pause before 104,105,106 appear.
> 
> Alain,
>   Are you using ping directly or via some other app?  This sounds like a buffer
> issue and I have seen this while coding where I forget to turnoff my output
> buffers.  It will run caching the output until it hits a certain size, the flush
> it to the screen.  Other than that, no idea why.

I am using the standard ping command, output not piped through anything.

It is not harmful, I don't think, I am just curious as to why it happens.

-- 
Alain Williams
Linux/GNU Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256  http://www.phcomp.co.uk/
Parliament Hill Computers Ltd. Registration Information: http://www.phcomp.co.uk/contact.php
Past chairman of UKUUG: http://www.ukuug.org/
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