Date: Sat, 27 Jul 2013 17:46:16 -0500 From: Mike Karels <mike@karels.net> To: Adrian Chadd <adrian@freebsd.org> Cc: FreeBSD Net <freebsd-net@freebsd.org>, Zaphod Beeblebrox <zbeeble@gmail.com> Subject: Re: Please implement patch in PR180893 Message-ID: <201307272246.r6RMkG7c003205@mail.karels.net> In-Reply-To: Your message of Sat, 27 Jul 2013 14:55:29 -0700. <CAJ-Vmo=k45X1U1=khnaJNx4sjV1Y2zAeyn_T8YYNE%2B9MWTV2VA@mail.gmail.com>
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> Sure, but it would be nice to file bugs with VMware and such to ensure > they fix their bugs. fwiw, I use IPv6 with recent versions of ESXi and VMware Workstation, and have not seen this problem. I'm curious if the problem is in old versions or with particular configurations. > Anyone have any issue with this? The issue I have is the if_printf(), > it should be rate limited at the very least. It would also be nice to > have a different counter to reflect that kind of dropped packet.. Agreed to both; I'd rather reserve if_ierrors for NIC-reported errors. I also think the message should say "from my MAC address" (vs IP). > 2c, 2c more, Mike On 27 July 2013 13:49, Zaphod Beeblebrox <zbeeble@gmail.com> wrote: > I'd like to advocate implementing > http://www.freebsd.org/cgi/query-pr.cgi?pr=180893 > > Quoting the PR: > > Some errant network equipment (including the simulation of a network > by VMware, as an example) will reflect back multicast packets to the sender. > This breaks protocols such as DAD and makes IPv6 nearly impossible to use > on these networks. > > Now, the argument could be made to fix these network elements, but > there is an elegant solution that improves the quality of FreeBSD: To refuse > packets that have a source ethernet address of the receiving interface. If > you consider this notion, you can quickly and easily accept that an > interface > should never "receive" a packet from it's own MAC address. > > This behaviour mirrors Linux behavior and I assume Windows behavior. > > I won't claim to be experienced in kernel matters, but I chose the > location for this modification to allow BPF to "see" the packets (for > network diagnosis). This test, however, could be moved within this function > or even given a sysctl knob. > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
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