[Dnsmasq-discuss] Override DNS servers in DHCP packet

A C agcme at hotmail.com
Fri Oct 3 19:24:10 BST 2008


> Date: Fri, 3 Oct 2008 17:09:39 +0000
> From: richardvoigt
> Subject: Re: [Dnsmasq-discuss] Override DNS servers in DHCP packet

> On Wed, Sep 24, 2008 at 12:51 AM, A C <agcme> wrote:

> >> On Tue, 23 Sep 2008 15:45:24 -0400
> >> A C <agcme at hotmail.com> wrote:
> >>
> >> >
> >> > Does dnsmasq use the DNS servers listed in /etc/resolv.conf over those
> >> > listed in a DHCP packet? I was forced to use DHCP for my public connection
> >> > but I don't want to use the provided DNS servers as they are slower than the
> >> > ones I had manually configured.
> >>
> >> I think typically the DHCP client would write /etc/resolv.conf with the
> >> information it is provided by the DHCP server. Then dnsmasq looks
> >> there, unless you configure it otherwise.
> >>
> >> If you're talking about serving up different DNS servers via dnsmasq's
> >> bult-in DHCP server, then take a look at: dnsmasq --help dhcp
> >>
> >
> > I was indeed talking about the first situation and not serving up alternate
> > DNS servers.  As it turns out, my installation is using udhcpd and writing
> 
> udhcpc more likely

Yes udhcpc, I typoed.

> > the data to /tmp/resolv.conf while dnsmasq is still looking at
> > /etc/resolv.conf.  Since I don't have any directives to look at any other
> > resolv.conf that I can see, I think it's safe to assume that dnsmasq is
> > honoring my own /etc/resolv.conf and ignoring the DHCP packet.
> 
> Sounds like OpenWRT, where /etc/resolv.conf and /tmp/resolv.conf are
> actually the same file (symlinked) by default.

Not on my installation, they are independent files.  So it works out.

> Note that there's a dnsmasq configuration option to have it look at a
> file other than /etc/resolv.conf ... surely no dhcp client is going to
> tamper with a file named /etc/resolv.dnsmasq for instance.


I should think not but I had to make sure.

_________________________________________________________________
Get more out of the Web. Learn 10 hidden secrets of Windows Live.
http://windowslive.com/connect/post/jamiethomson.spaces.live.com-Blog-cns!550F681DAD532637!5295.entry?ocid=TXT_TAGLM_WL_domore_092008
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/attachments/20081003/36a67539/attachment-0001.htm


More information about the Dnsmasq-discuss mailing list