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Date:      Sat, 20 Aug 2016 18:47:50 +0100
From:      Bruce Simpson <bms@fastmail.net>
To:        Slawa Olhovchenkov <slw@zxy.spb.ru>, Ryan Stone <rysto32@gmail.com>
Cc:        "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, Ryan Stone <rstone@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, Adrian Chadd <adrian@freebsd.org>
Subject:   Re: svn commit: r304436 - in head: . sys/netinet
Message-ID:  <598d1827-f834-5172-1431-9ecf25eb3b5c@fastmail.net>
In-Reply-To: <20160820173050.GQ22212@zxy.spb.ru>
References:  <201608182259.u7IMx5oW002018@repo.freebsd.org> <4fbc2e1d-3a62-5963-83d5-f9c931503e51@fastmail.net> <3806700d-ed27-7915-4818-c2d64f7b806d@fastmail.net> <CAFMmRNyi=PwE9pc9_8wCU63=HttUzFR4Zh2v=uHKcQ-zaLxdJQ@mail.gmail.com> <fcb33eac-ec99-03c7-57b5-f24f86c4f41a@fastmail.net> <CAFMmRNwDPy4Hd35DrfREZQzjvd89qw=zhEriddG8U8NV7tD=EA@mail.gmail.com> <6f4449f2-d145-8b49-c3f0-433e8ff4d2a2@fastmail.net> <CAFMmRNypgJc00XH277oB3EEGje4xq%2B8_qcJfZu4jjBfTfa7GGQ@mail.gmail.com> <20160820173050.GQ22212@zxy.spb.ru>

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On 20/08/16 18:30, Slawa Olhovchenkov wrote:
> Anyway, don't should relay on the L2 information, you can recive L3
> unicast addressed packets (with alien dst IP address) in L2 broadcas
> packet.

That is exactly what the egress routers in chapter 6 of my PhD do, but 
in a very controlled way -- by setting and clearing M_MCAST !

http://hdl.handle.net/10023/8681

In Ch6, ILNPv6 packets are effective being routed, using a multicast 
next-hop address (as distinct from the destination I-LV, which in turn 
is distinct from an IPv6 destination -- it just uses the same format.)

It's counter-intuitive (and should not happen outside of that 
constrained scenario), but it has real world applications.



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