netdev - Re: [RFD] First draft of RDNSS-in-RA support for IPv6 DNS autoconfiguration

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Message-ID: <467CA683.2000706@simon.arlott.org.uk>
Date:	Sat, 23 Jun 2007 05:50:11 +0100
From:	Simon Arlott <simon@...e.lp0.eu>
To:	David Stevens <dlstevens@...ibm.com>
CC:	"C. Scott Ananian" <cscott@...top.org>, netdev@...r.kernel.org
Subject: Re: [RFD] First draft of RDNSS-in-RA support for IPv6 DNS autoconfiguration

On 23/06/07 05:30, David Stevens wrote:
> netdev-owner@...r.kernel.org wrote on 06/22/2007 06:17:46 PM:
Is there a reason why you're CC:ing the Sender? Doesn't that end 
up in the mailbox(es) of the netdev admin(s)?

>> On 23/06/07 02:04, David Stevens wrote:
>>>         Why not make the application that writes resolv.conf
>>> also listen on a raw ICMPv6 socket? I don't believe you'd need
>>> any kernel changes, then, and it seems pretty simple and
>>> straightforward.
>> Because then it requires yet another network daemon, RA in 
>> the kernel means there's no need for one to manage adding 
>> auto-configured IP addresses... what's wrong with doing the 
>> same for DNS?
> 
>         It's not yet another one, since you have to run something
> to get it in resolv.conf, anyway. That seems much better to me

Well, it'd be the library including it - so there'd be no daemon 
application involved.

> than having the kernel track data that can only be used at the
> application layer. The app itself looks like it'd be really simple.

Keeping application data in the kernel does start to get silly though, 
e.g. everything in dhcp-options(5)... but DNS is used almost 
everywhere. This could be a configuration option so that anyone who 
doesn't want it can disable it completely.

>         Auto-configured addresses are used by the kernel. It has to
> have those addresses. But the kernel doesn't do DNS look-ups, or
> write resolv.conf; that's the difference, for me.

Using DHCPv6 as an example, auto-configuration does not have to be in 
the kernel at all either.

-- 
Simon Arlott
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