Date: Wed, 24 Jan 2001 00:30:24 -0500 From: "C. Stephen Gunn" <csg@waterspout.com> To: Julian Elischer <julian@elischer.org> Cc: Patrick Bihan-Faou <patrick@netzuno.com>, Mitch Collinsworth <mitch@ccmr.cornell.edu>, freebsd-net@FreeBSD.ORG Subject: Re: How to send arp request with no other traffic Message-ID: <20010124003024.A231@waterspout.com> In-Reply-To: <3A6E1499.D9578008@elischer.org>; from julian@elischer.org on Tue, Jan 23, 2001 at 03:32:41PM -0800 References: <HJEEKLMFLKEOKHOKNPBMKEDBCJAA.patrick@netzuno.com> <3A6E1499.D9578008@elischer.org>
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On Tue, Jan 23, 2001 at 03:32:41PM -0800, Julian Elischer wrote: > send a hand crafted arp packet out through the nergraph > hook on the interface and let the response be put in the table. This is a side-effect of the ARP packet processing mechanism described in STD-0037. All inbound ARP packets are processed and inserted into the kernel table, before checking if a response is solicited or appropriate. The intention of the original designers of ARP was to use this mechanism to minimize the need for broadcasts on the network. I bring this up to say this is only a valid assumption on the ARP implementation in FreeBSD. I have not compared the STD-0037 recommendations with the implementation in NetBSD, and I am fairly certain that Linux _DOES_NOT_ note arp-updates from unsolicited packets. <sigh> Sending spoofed ARP requests from the host in question will also require root, which inspecting the kernel routing and arp table currently doesn't. - Steve -- C. Stephen Gunn <csg@waterspout.com> | Waterspout Communications, Inc. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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