On Tue, Nov 13, 2012 at 09:03:03AM -0600, /dev/rob0 wrote: > On Tue, Nov 13, 2012 at 12:13:07PM +0100, s...@sltosis.org wrote: > > On Mon, Nov 12, 2012 at 06:11:43PM -0600, richardvo...@gmail.com > > wrote: > > > On Sun, Nov 11, 2012 at 5:05 PM, /dev/rob0 <r...@gmx.co.uk> > > > wrote: > > > > > On 10/11/2012 15:54, /dev/rob0 wrote: > > > > > >Seems to me that dnsmasq is a better nscd replacement, > > > > > >and it has a place in mobile computing. > > > > > > > > > > > ># we use this dnsmasq as this system's own resolver > > > > > >no-resolv > > > > > > > > On Sat, Nov 10, 2012 at 05:46:10PM -0600, > > > > richardvo...@gmail.com wrote: > > > > > no-resolv is doing more harm than good. > > > > > > > > > > dnsmasq is smart enough to ignore 127.0.0.1 in > > > > > /etc/resolv.conf And it will automatically pick up > > > > > DHCP-assigned DNS servers which written there. > > > > > > > > But you don't understand. The point of dnsmasq on a laptop > > > > is to serve ONLY that machine and its local processes. > > > > /etc/resolv.conf must contain ONLY "nameserver 127.0.0.1". > > > > If there are other nameservers listed, the system resolver > > > > will be contacting them; possibly getting different results, > > > > and ... well, this discussion would not be relevant to > > > > the dnsmasq list. > > > > > > > I don't know where you got this piece of misinformation. > > > Multiple nameserver entries in /etc/resolv.conf work fine, as > > > long as the localhost entry (pointing to dnsmasq) comes first. > > > > It will work fine, but the system resolver might end up querying > > an nameserver other than dnsmasq(localhost) which is exactly, if > > I understood correctly, what /dev/rob0 wants to avoid. > > Yes. And thanks to Richard for making me look in the resolv.conf(5) > manual. The listing order is the priority, but there's always a > chance that lookups could fall through from 127.0.0.1 to other > nameservers, and I don't want that. > > > That said, dnsmasq will poll your alternate resolv.conf for change > > automatically, unless requested otherwise (--no-poll), so I see no > > need to restart it after a change. > > Aha! I missed --no-poll. This looks to be pretty easy, then, using > --resolv-file. (And --no-resolv is moot.) > > > This is actually what I was doing* on my laptop, a custom dhcp > > client hook will fill an alternate resolv.conf file : > > /etc/resolv.conf-dnsmasq (used by dnsmasq), and ensure > > /etc/resolv.conf only contains the localhost nameserver with > > optionnal supplementary parameters (search,...) > > Thanks! > > > This is obviously usefull for dnsmasq cache and other features (eg: > > server=//), but also for some services/daemons which don't poll > > /etc/resolv.conf for change on their own(eg: postfix) > > Hehe, it seemed a bit crazy to run server software on a laptop, but > at least I'm not putting Postfix on there. (Yet? ;) ) >
Well I have to admit it may sound crazy, but it is not *that* crazy if you have a terrible connection, where a simple email can take up to a few seconds being sent I'm using mutt and I can't do anything else during that step if using mutt sending facilities. (now imagine a normal email with an attachment, or a network problem and the need to try again?! no really using postfix to do part of what it is supposed to do is a must!) > For the archives, here's what I ended up with on the laptop: > > no-dhcp-interface=lo > listen-address=127.0.0.1 > no-resolv > resolv-file=/var/lib/dhcpcd/resolv.conf > user=dnsmasq > group=dnsmasq > server=/rob0.vpn/192.168.6.1 > server=/6.168.192.in-addr.arpa/192.168.6.1 > > /etc/resolv.conf contains only "nameserver 127.0.0.1". (It could just > as well not exist, because the default resolver behavior is to query > DNS from 127.0.0.1.) And dhcpcd(8) is writing domain_name_servers to > /var/lib/dhcpcd/resolv.conf. > -- > http://rob0.nodns4.us/ -- system administration and consulting > Offlist GMX mail is seen only if "/dev/rob0" is in the Subject: > > _______________________________________________ > Dnsmasq-discuss mailing list > Dnsmasq-discuss@lists.thekelleys.org.uk > http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss _______________________________________________ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
