From owner-freebsd-questions  Thu Sep  4 21:22:51 1997
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Date: Fri, 5 Sep 1997 00:28:28 -0400 (EDT)
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To: Michael Richards <026809r@dragon.acadiau.ca>
cc: freebsd-questions@FreeBSD.ORG
Subject: Re: Ping bug?
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In looking at the latest issue of Phrack (#51), I found a very nice port
scanner that is smart enough to ping hosts before it scans them.  It's a
very slick tool, but to make a long story short, I was looking at stealing
the ping they wrote that incorporates a very short ping time.  Perfect for
checking local hosts or sweeping through a range of IPs to see who's up
without that annoying timeout.  If you'rehandy with C, I recommend looking
at the source, it seems like it could be easily lifted out of the
package....

Charles


On Thu, 4 Sep 1997, Michael Richards wrote:

> Hi.
> 
> I have an interesting problem with ping. I don't know if it is a bug or
> not.
> 
> The man page says that the -Q switch will shut it up when it comes to error
> messages.
> 
> I am writing a package to tell me if the host is up or down.
> the script calls:
> ping -c1 -Q lib226-1.acadiau.ca
> at this time it is dead. so it tries:
> ping -c10 -Q lib226-1.acadiau.ca
> if nothing comes back, we assume lib226-1 is dead.. right?
> 
> Here's what I keep getting back.
> 
> ping: sendto: Host is down
> ping: wrote lib226-1.acadiau.ca 64 chars, ret=-1
> 
> According to the man page, it shouldn't give me any errors. Even funnier, it
> seems to behave correctly if I just start off pinging it once. As soon as I
> try pinging a second time in a row, it spits out these error messages...
> 
> Any ideas?
> 
> -Mike
>