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

[Lennart Sorensen]

On Mon, Sep 21, 2009 at 11:41:42AM -0400, 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.
> 
> dns says 'put 127.0.0.1 in resolv.conf'
> dhcp client says 'put foo in resolv.conf'
> 
> Not a very stable configuration.  Often seen when revolveconf package
> is in use.

In other words, don't install a caching name server on a dhcp client
machine. :)

-- 
Len Sorensen
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