Re: Internet Connection Sensor -- MIDRANGE-L

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Subject: Re: Internet Connection Sensor
From: "Mark S. Waterbury" <mark.s.waterbury@xxxxxxx>
Date: Wed, 20 Jan 2010 11:56:08 -0500
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Hi, Alan:

> Alan Shore wrote:

Be careful in relying on PING
Some sites do not PING, even when they are up
Why? Don't know

Why? Many firewalls have rules to block pings, to stave off "ping of death" attacks, or a "ping flood" (denial of service attack) etc. -- see:

http://en.wikipedia.org/wiki/Ping_of_death
and
http://en.wikipedia.org/wiki/Ping_flood

Cheers,

Mark S. Waterbury

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