Re: [Dnsmasq-discuss] resolving server's hostname
Hi Carl, Le Sat, 18 Feb 2017 21:53:52 -0600 Carl Karstena écrit: > [...] > > so if I set no-hosts, how does dnsmaq figure out how to resolve >> dc10b? Just the same way it does any other machine; the fact that a machine is a name server does not make its name(s) or IP address(es) any special in the *content* of the zone it serves. For instance: - some zone admins will want the local DHCP and DNS server(s) to not have any entry in the local zone, because no machine in the LAN is supposed to need refering them by name. - some zone admins will want to give the DHCP server the name "dhcp" and the DNS server the name "dns" because they want to be able to not remember the actual IP address for them. - some zone admins will want every machine on the LAN to have a name which describes the make and model of the machine, e.g. "rpi-1234", and they want this to apply to servers too. - etc. So, really, as far as the zone contents is concerned, dnsmasq does not care whether an entry in it is the DNS server, DHCP server, or neither. If you want the local machines to know that dc10b is 10.20.1.3, then you should have an entry in the zone for it. Whether you do that with an /etc/hosts line, or you use no-hosts and put a host-record option in your dnsmasq configuration file is up to you. Either method works. > ore really, what should I be doing so that 'things work as I expect' ? What you should do is define what you expect :) -- i.e. decide how you want to manage the content of your LAN zone. For instance, in my case I want the the host running my dnsmasq known by both a 'given name' and several functional names, and I want *all* LAN host names in a single file different from he dnsmasq configuration file, so I use addn-hosts to point dnsmasq to this file, which contains among others the 'given' and functional names of the dnsmasq server itself. But how /you/ do it is really for /you/ to decide; the way /I/ do may not fit your needs. Amicalement, -- Albert. ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] resolving server's hostname
On Sat, Feb 18, 2017 at 12:06 PM, Albert ARIBAUDwrote: > Hi Carl, > > Le Sat, 18 Feb 2017 09:31:19 -0600 > Carl Karsten a écrit: > > > dc10b is the dnsmasq server > > Ok; and I assume that you are running 'host' on another machine, right? > yes. also running it on dc10b. > > > I am using a modified version of this: > > https://anonscm.debian.org/git/debconf-video/ansible.git/ > tree/roles/dhcp-server > > Can't say it tells me much. :) > > > I haven't checked in the mods yet because things are still a little > > wonky. git diff ... skimmed, don't see anything that would affect > > dnsmasq. > > > > juser@dc10b:~$ cat /etc/dnsmasq.d/local.conf > > ## Ansible managed > > > > interface=eth-local > > domain=lca2017.lan > > dhcp-range=10.20.1.10,10.20.1.254,6h > > dhcp-option-force=210,/srv/tftp/ > > dhcp-boot=pxelinux.0 > > dhcp-authoritative > > enable-tftp > > tftp-root=/srv/tftp > > And what's the /etc/hosts? > juser@dc10b:~$ cat /etc/hosts 127.0.0.1localhost 127.0.1.1dc10b # The following lines are desirable for IPv6 capable hosts ::1 localhost ip6-localhost ip6-loopback ff02::1 ip6-allnodes ff02::2 ip6-allrouters Note: that is current. I have been changing the dc10b line, but it should be clear in my posts what it is when I show test results. > > > Hmm, on an openwtt ap running dnsmasq: > > > > root@tpap:~# cat /etc/resolv.conf > > search lan > > nameserver 127.0.0.1 > > > > root@tpap:~# cat /etc/hosts > > 127.0.0.1 localhost > > > > root@tpap:~# nslookup tpap > > Server:127.0.0.1 > > Address 1: 127.0.0.1 localhost > > Name: tpap > > Address 1: 192.168.1.2 tpap.lan > > What's 'tpap' supposed to be? > > 192.168.1.2 so this install does what I would expect. > Anyway, my guess: your dnsmasq server has its own name listed in > its /etc/hosts with 127.0.1.1 as the matching IP, correct > and your dnsmasq > config does not contain option no-hosts, correct > so your dnsmasq uses > its /etc/hosts when resolving a name; ergo, it resolves its own name to > 127.0.1.1. > correct so if I set no-hosts, how does dnsmaq figure out how to resolve dc10b? ore really, what should I be doing so that 'things work as I expect' ? > > Amicalement, > -- > Albert. > ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] resolving server's hostname
Hi Carl, Le Sat, 18 Feb 2017 09:31:19 -0600 Carl Karstena écrit: > dc10b is the dnsmasq server Ok; and I assume that you are running 'host' on another machine, right? > I am using a modified version of this: > https://anonscm.debian.org/git/debconf-video/ansible.git/tree/roles/dhcp-server Can't say it tells me much. :) > I haven't checked in the mods yet because things are still a little > wonky. git diff ... skimmed, don't see anything that would affect > dnsmasq. > > juser@dc10b:~$ cat /etc/dnsmasq.d/local.conf > ## Ansible managed > > interface=eth-local > domain=lca2017.lan > dhcp-range=10.20.1.10,10.20.1.254,6h > dhcp-option-force=210,/srv/tftp/ > dhcp-boot=pxelinux.0 > dhcp-authoritative > enable-tftp > tftp-root=/srv/tftp And what's the /etc/hosts? > Hmm, on an openwtt ap running dnsmasq: > > root@tpap:~# cat /etc/resolv.conf > search lan > nameserver 127.0.0.1 > > root@tpap:~# cat /etc/hosts > 127.0.0.1 localhost > > root@tpap:~# nslookup tpap > Server:127.0.0.1 > Address 1: 127.0.0.1 localhost > Name: tpap > Address 1: 192.168.1.2 tpap.lan What's 'tpap' supposed to be? Anyway, my guess: your dnsmasq server has its own name listed in its /etc/hosts with 127.0.1.1 as the matching IP, and your dnsmasq config does not contain option no-hosts, so your dnsmasq uses its /etc/hosts when resolving a name; ergo, it resolves its own name to 127.0.1.1. Amicalement, -- Albert. ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] resolving server's hostname
dc10b is the dnsmasq server I am using a modified version of this: https://anonscm.debian.org/git/debconf-video/ansible.git/tree/roles/dhcp-server I haven't checked in the mods yet because things are still a little wonky. git diff ... skimmed, don't see anything that would affect dnsmasq. juser@dc10b:~$ cat /etc/dnsmasq.d/local.conf ## Ansible managed interface=eth-local domain=lca2017.lan dhcp-range=10.20.1.10,10.20.1.254,6h dhcp-option-force=210,/srv/tftp/ dhcp-boot=pxelinux.0 dhcp-authoritative enable-tftp tftp-root=/srv/tftp Hmm, on an openwtt ap running dnsmasq: root@tpap:~# cat /etc/resolv.conf search lan nameserver 127.0.0.1 root@tpap:~# cat /etc/hosts 127.0.0.1 localhost root@tpap:~# nslookup tpap Server:127.0.0.1 Address 1: 127.0.0.1 localhost Name: tpap Address 1: 192.168.1.2 tpap.lan On Sat, Feb 18, 2017 at 6:15 AM, Albert ARIBAUDwrote: > Hi Carl, > > Le Fri, 17 Feb 2017 02:06:16 -0600 > Carl Karsten a écrit: > > > juser@dc10b:~$ host dc10b > > dc10b has address 127.0.1.1 > > > > It should be 10.20.1.3 > > > > How do I make that happen? > > Hmm... Can you elaborate on the context of your problem? This does not > happen to me -- my machine even has an entry in its own /etc/hosts with > its name tied to 127.0.0.1 but a host or dig will return its LAN > address. > > Amicalement, > -- > Albert. > ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] resolving server's hostname
Hi Carl, Le Fri, 17 Feb 2017 02:06:16 -0600 Carl Karstena écrit: > juser@dc10b:~$ host dc10b > dc10b has address 127.0.1.1 > > It should be 10.20.1.3 > > How do I make that happen? Hmm... Can you elaborate on the context of your problem? This does not happen to me -- my machine even has an entry in its own /etc/hosts with its name tied to 127.0.0.1 but a host or dig will return its LAN address. Amicalement, -- Albert. ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
[Dnsmasq-discuss] resolving server's hostname
juser@dc10b:~$ host dc10b dc10b has address 127.0.1.1 It should be 10.20.1.3 How do I make that happen? ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss