Date: Wed, 17 May 2006 10:41:17 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: JINMEI Tatuya / =?ISO-2022-JP?B?GyRCP0BMQEMjOkgbKEI=?= <jinmei@isl.rdc.toshiba.co.jp> Cc: freebsd-net@freebsd.org, freebsd-pf@freebsd.org Subject: Re: IPv6 raw socket to send original udp Message-ID: <20060517103906.P49041@fledge.watson.org> In-Reply-To: <y7v64k6qiab.wl%jinmei@isl.rdc.toshiba.co.jp> References: <20060508.054451.41688849.yamamoto436@oki.com> <y7v64k6qiab.wl%jinmei@isl.rdc.toshiba.co.jp>
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On Tue, 16 May 2006, JINMEI Tatuya / [ISO-2022-JP] ¿ÀÌÀãºÈ wrote: > So, if a program needs to specify an arbitrary source IPv6 address for > outgoing packets, it should use other "packet injection" interface such as > BPF. One problem with using BPF for packet injection in IPv4 is that it requires the sender to provide the link layer encapsulation, make the routing decision, and perform any address resolution. Using raw sockets with the full header option allows the sender to generate a datagram from an arbitrary source yet not perform those routing and link layer activities, which require more intimate knowledge of the link type. It might be desirable to add a socket option to allow the specification of the source address in order to allow packet replay tools, etc, to work without link layer knowledge. Robert N M Watson
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