Date: Thu, 24 Aug 2006 15:29:09 +0200 From: Fredrik Lindberg <fli+freebsd-net@shapeshifter.se> To: Pat Lashley <patl@volant.org> Cc: freebsd-net@freebsd.org, Doug Barton <dougb@freebsd.org> Subject: Re: Zeroconfig and Multicast DNS Message-ID: <44EDA9A5.2050108@shapeshifter.se> In-Reply-To: <AC5769F16F9730CABCCC4E61@garrett.local> 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> <AC5769F16F9730CABCCC4E61@garrett.local>
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Pat Lashley wrote: >> 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. > > I treat LLA and mDNS as separate things. They can be used individually or together. I see LLA as a way of configuring an IP-address while mDNS is a way of resolving DNS-like hostnames. Howevery, your statement above brings up a question, do you assume that a system configured with lla should be able to communicate with a system configured via dhcp? I would assume no, per standard IP/routing rules as they would be in different subnets and would require a router to tell them about each other which somehow violates the link local scope of the 169.254/16 address space. >> 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...) > Yes, discovering a NAT-router via SD is certainly possible, but I'm not sure if this should be in the lla-daemon or in a separate program. Fredrik Lindberg
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