From mboxrd@z Thu Jan 1 00:00:00 1970 From: chuck gelm Subject: tcpdump: How do I filter 'bootp' packets? Date: Wed, 08 Dec 2004 08:13:32 -0500 Message-ID: <41B6FDFC.3070309@gelm.net> References: <5.1.0.14.1.20041207220544.01f98370@celine> Reply-To: chuck@gelm.net Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <5.1.0.14.1.20041207220544.01f98370@celine> Sender: linux-newbie-owner@vger.kernel.org List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: linux-newbie@vger.kernel.org Howdy: I have cable modem access to the internet now and the download speed is double my original DSL speed. :-) However, I am concerned about security. Can other cable modem subscribers see my packets? To test this, I am trying to use tcpdump to monitor packets that my cable modem is sending to my 'router'. I am using these arguments: tcpdump -i eth1 -c 9 -nt not arp and not host W.X.Y.Z > \ http://gelm.net/tcpdump.txt ( == My assigned IP address) I am still seeing many 'bootp' packets. How do filter out 'bootp' packets with tcpdump? Regards, Chuck - To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs