really weird(?) DNS setup on linksys router running DD-WRT

[Robert P. J. Day]

On Mon, 21 Sep 2009, Lennart Sorensen wrote:

> On Mon, Sep 21, 2009 at 10:58:47AM -0400, Darryl Moore wrote:
> >
> >
> > Lennart Sorensen wrote:
> > > On Mon, Sep 21, 2009 at 10:23:52AM -0400, Robert P. J. Day wrote:
> > >>   i figure i might as well bug the tlug list on this one, since the
> > >> location is in TO.
> > >>
> > >>   was helping someone install some linux software this weekend,
> > >> and there seemed to be intermittent network problems (losing
> > >> ssh login sessions), as well as DNS resolvability errors.
> > >>
> > >>   took a look at a couple of the internal linux systems (call
> > >> them 192.168.1.100 and 192.168.1.101), and their
> > >> /etc/resolv.conf files read:
> > >>
> > >>   nameserver 127.0.0.1
> > >>   nameserver 192.168.1.1   (the router)
> > >>   search domain1 domain2
> > >
> > > resolv.conf controls what the router uses to resolve dns
> > > queries. It has no effect on how clients behind the router get
> > > DNS at all. Does the router have any need for external DNS at
> > > all really?
> > >
> >
> > What?
> >
> > resolve.conf is on the clients. It has nothing to do with the
> > router other then, in this case, to direct the clients to it.
> >
> > I think you need to reread his query.
>
> Oh, yes I see.  Well I know that if you install a caching nameserver,
> then that kind of setup may happen, at least in combination with some
> dhcp client configurations.

  i *figured* you misunderstood, lennart, since i can't see you making
that kind of mistake. :-)

  and, yes, i can see now (based on hugh's posting as well) that it
might be a clever setup where one of the internal systems is set up as
a caching nameserver.  but i think i'll just go for simplicity for
now, and get fancier once i do some reading.

  i haven't taken a close look at the open source dd-wrt router
firmware -- does it support caching on the router itself, does anyone
know?

rday
--

========================================================================
Robert P. J. Day                               Waterloo, Ontario, CANADA

        Linux Consulting, Training and Annoying Kernel Pedantry.

Web page:                                          http://crashcourse.ca
Twitter:                                       http://twitter.com/rpjday
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