From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from gate1.cherrypoint.usmc.mil ([192.156.73.34]) by speech.braille.uwo.ca with smtp (Exim 3.36 #1 (Debian)) id 1ArJTX-0003Zj-00 for ; Thu, 12 Feb 2004 11:14:03 -0500 Message-ID: <6D3A09C6CAB0D311BA5000902760D022040F1F8F@chpt0000se01.cherrypoint.usmc.mil> From: Whitley CTR Cecil H To: "'Speakup is a screen review system for Linux.'" Date: Thu, 12 Feb 2004 11:15:15 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain; charset="iso-8859-1" X-Content-Filtered-By: Mailman/MimeDel 2.1.4 Subject: Re: Is ICMP important? X-BeenThere: speakup@braille.uwo.ca X-Mailman-Version: 2.1.4 Precedence: list Reply-To: "Speakup is a screen review system for Linux." List-Id: "Speakup is a screen review system for Linux." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Feb 2004 16:14:03 -0000 Hi Chuck, I would like to point out one fact that you may not be aware of. ICMP echo requests and ICMP echo replies are two seperate beasts. You may have your firewall set up to allow icmp echo requests and deny icmp echo replies. This would provide the behavior you are seeing since incoming requests would not be filtered but incoming replies would be. Outgoing replies wouldn't be filtered since your system is generating them. This would result in others being able to ping you while you are unable to ping others. If you need assistance in distinguishing one from the other, let me know and i'll go look it up and post. regards, Cecil