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Date:      Thu, 24 Aug 2006 05:44:20 -0400
From:      Pat Lashley <patl@volant.org>
To:        Fredrik Lindberg <fli+freebsd-net@shapeshifter.se>
Cc:        freebsd-net@freebsd.org, Doug Barton <dougb@freebsd.org>
Subject:   Re: Zeroconfig and Multicast DNS
Message-ID:  <AC5769F16F9730CABCCC4E61@garrett.local>
In-Reply-To: <44ED3BD1.3030206@shapeshifter.se>
References:  <DD49A62B2AB4E38804FB10B6@garrett.local> <44EA1926.2000501@shapeshifter.se> <9C04919EE684029A410DE208@garrett.local> <44EAC40E.9000904@shapeshifter.se> <3E654CC0217F90E20FCD806E@garrett.local> <44EC90B7.6090908@shapeshifter.se> <44ECB0F2.9040300@FreeBSD.org> <C408C9E0406302DF5EE12E67@garrett.local> <20060823212110.GD27961@lor.one-eyed-alien.net> <D6D2605619AD2B0F140F5802@garrett.local> <20060823221835.GA28978@lor.one-eyed-alien.net> <23D2619F6BACE4E728178EE5@garrett.local> <44ED3BD1.3030206@shapeshifter.se>

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> Um..wouldn't the routing code handle this?
> If you set a lla address and some other address on a interface like 
192.168.0.2
> or something and then a default route of 192.168.0.1, I
> would assume that an application without specific knowledge that tries
> to contact an external address would get 192.168.0.2 as the source
> address and that the packet is sent to 192.168.0.1.

It should handle it; but I'd still want someone to check out various edge 
conditions and pathological cases.

> If you're in the situation that you need lla (no dhcp server available),

The presence or absence of a DHCP server is not a good indicator of the need or 
desire for LLA and/or mDNS. It is quite possible that the system is in a mixed 
environment where there are some systems which are LLA/mDNS only, others which 
are DHCP/static/unicast DNS only, and others which handle both.


> you wouldn't know the default route right?

I believe that there is a way to announce routing service via mDNS-SD; but I 
don't know the details. (I would be astonished to discover that the people who 
developed the zeroconfig design left that bit out...)



-Pat 



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