Date: Mon, 06 Apr 2020 17:22:48 +0200 From: Philip Homburg <pch-fbsd-2@u-1.phicoh.com> To: freebsd-net@freebsd.org Subject: Re: Revisiting FreeBSD-SA-08:10.nd6 (or: avoiding IPv6 pain) Message-ID: <m1jLTaK-0000KhC@stereo.hq.phicoh.net> In-Reply-To: Your message of "Sun, 5 Apr 2020 16:28:32 -0300 ." <327cf281-ca39-7c2f-3545-0edd3b40808f@gont.com.ar>
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>However, when a packet from an "off-link" network is employed, the >sending node has no way of knowing where to send the packet, unless it >simply swaps the src and dst mac addresses, and uses the source address >of the packet as the destination addresses. No, a node can just use the normal IPv6 send mechnisms to send a NA message. If the destination is off-link then the packet gets sent to the default router. Then, if the default router considers the destination on-link, it will forward the packet and send a redirect. The redirect should have a link layer address to allow the target host to send future traffic directly.
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