Re: [Dnsmasq-discuss] Rather basic question - how do you tell dnsmasq what upstream DNS servers to use?
Use --server. Met vriendelijke groeten, William Edwards - Original Message - From: Chris Green (c...@isbd.net) Date: 10/03/20 17:41 To: dnsmasq-disc...@thekelleys.org.uk Subject: [Dnsmasq-discuss] Rather basic question - how do you tell dnsmasq what upstream DNS servers to use? I'm feeling really silly, I've been using dnsmasq for several years running it on a dedicated Raspberry Pi on the LAN to provide local DNS. It's been working perfectly OK but just a very short while ago the Google DNS server at 8.8.8.8 went down for a while and it's what I (appear to) use as the upstream DNS. How and where does one set dnsmasq's upstream DNS? Is it the following line in /etc/dhcpcd.conf :- /etc/dhcpcd.conf:static domain_name_servers=192.168.1.4 8.8.8.8 fd51:42f8:caae:d92e::1 The file /run/dnsmasq/resolv.conf appears to be derived directly from the above:- chris@newdns$ more resolv.conf # Generated by resolvconf nameserver 192.168.1.4 nameserver 8.8.4.4 nameserver fd51:42f8:caae:d92e::1 The Raspberry Pi running dnsmasq is 192.168.1.4 on the LAN here, I'm running dnsmasq version 2.76. Would I be better with two unrelated DNS servers in the above configuration, e.g. a Google one and one from my ISP? -- Chris Green ___ 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
Re: [Dnsmasq-discuss] Rather basic question - how do you tell dnsmasq what upstream DNS servers to use?
On Sat, Oct 03, 2020 at 07:19:10PM +0100, Chris Green wrote: > On Sat, Oct 03, 2020 at 06:06:56PM +0200, Geert Stappers wrote: > > On Sat, Oct 03, 2020 at 03:59:46PM +0100, Chris Green wrote: > > > I'm feeling really silly, I've been using dnsmasq for several years > > > running it on a dedicated Raspberry Pi on the LAN to provide local DNS. > > > > > > It's been working perfectly OK but just a very short while ago the > > > Google DNS server at 8.8.8.8 went down for a while and it's what I > > > (appear to) use as the upstream DNS. > > > > > > How and where does one set dnsmasq's upstream DNS? Is it the following > > > line in /etc/dhcpcd.conf :- > > > > > > /etc/dhcpcd.conf:static domain_name_servers=192.168.1.4 8.8.8.8 > > > fd51:42f8:caae:d92e::1 > > > > > > The file /run/dnsmasq/resolv.conf appears to be derived directly from > > > the above:- > > > > > > chris@newdns$ more resolv.conf > > > # Generated by resolvconf > > > nameserver 192.168.1.4 > > > nameserver 8.8.4.4 > > > nameserver fd51:42f8:caae:d92e::1 > > > > > > The Raspberry Pi running dnsmasq is 192.168.1.4 on the LAN here, I'm > > > running dnsmasq version 2.76. > > > > Snippet from the dnsmasq manual page: > > > >-S, --local, > > > > --server=[/[]/[domain/]][[#][@|[#]] > > Specify IP address of upstream servers > > directly. Setting this flag does not suppress > > reading of /etc/resolv.conf, use --no-resolv to do that. > > > Yes, but do I want it to ignore /etc/resolv.conf (well, actually, > /var/run/dnsmasq/resolv.conf) ? Do I want resolvconf to handle which > DNS servers are used or am I better turning resolvconf off altogether? When possible: Yes. Or even better: Make turning of resolvconf possible and do it. Underlying idea: Dnsmasq is a server thing, resolvconf is a client thing. Roughly the defintion of those two: Server: configurated by administrator knowing what should be done. Client: configurated by stuff on network, tends to break outside the default. Regards Geert Stappers -- Silence is hard to parse ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] Rather basic question - how do you tell dnsmasq what upstream DNS servers to use?
On Sat, Oct 03, 2020 at 06:06:56PM +0200, Geert Stappers wrote: > On Sat, Oct 03, 2020 at 03:59:46PM +0100, Chris Green wrote: > > I'm feeling really silly, I've been using dnsmasq for several years > > running it on a dedicated Raspberry Pi on the LAN to provide local DNS. > > > > It's been working perfectly OK but just a very short while ago the > > Google DNS server at 8.8.8.8 went down for a while and it's what I > > (appear to) use as the upstream DNS. > > > > How and where does one set dnsmasq's upstream DNS? Is it the following > > line in /etc/dhcpcd.conf :- > > > > /etc/dhcpcd.conf:static domain_name_servers=192.168.1.4 8.8.8.8 > > fd51:42f8:caae:d92e::1 > > > > The file /run/dnsmasq/resolv.conf appears to be derived directly from > > the above:- > > > > chris@newdns$ more resolv.conf > > # Generated by resolvconf > > nameserver 192.168.1.4 > > nameserver 8.8.4.4 > > nameserver fd51:42f8:caae:d92e::1 > > > > The Raspberry Pi running dnsmasq is 192.168.1.4 on the LAN here, I'm > > running dnsmasq version 2.76. > > Snippet from the dnsmasq manual page: > >-S, --local, > > --server=[/[]/[domain/]][[#][@|[#]] > Specify IP address of upstream servers >directly. Setting this flag does not suppress >reading of /etc/resolv.conf, use --no-resolv to do that. > Yes, but do I want it to ignore /etc/resolv.conf (well, actually, /var/run/dnsmasq/resolv.conf) ? Do I want resolvconf to handle which DNS servers are used or am I better turning resolvconf off altogether? -- Chris Green ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
[Dnsmasq-discuss] Overriding server-identifier in DHCP response
When I run with log-dhcp enabled, I notice the following option in dnsmasq's DHCP response: dnsmasq-dhcp: 756190107 sent size: 4 option: 54 server-identifier 172.17.0.2 This is the local IP address of the network interface that dnsmasq is using. But dnsmasq is running inside a virtual machine with NAT, and this IP address is not the network-facing address. Is there a way to change the response? I've tried setting dhcp-option=option:server-identifier(or 54),... but dnsmasq doesn't accept it. I've also tried using 11 which I believe is some kind of server-identifier override. That also did not work. I'm using dnsmasq to do DHCP proxying for PXE. Thanks, Ryan ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] Rather basic question - how do you tell dnsmasq what upstream DNS servers to use?
On Sat, Oct 03, 2020 at 03:59:46PM +0100, Chris Green wrote: > I'm feeling really silly, I've been using dnsmasq for several years > running it on a dedicated Raspberry Pi on the LAN to provide local DNS. > > It's been working perfectly OK but just a very short while ago the > Google DNS server at 8.8.8.8 went down for a while and it's what I > (appear to) use as the upstream DNS. > > How and where does one set dnsmasq's upstream DNS? Is it the following > line in /etc/dhcpcd.conf :- > > /etc/dhcpcd.conf:static domain_name_servers=192.168.1.4 8.8.8.8 > fd51:42f8:caae:d92e::1 > > The file /run/dnsmasq/resolv.conf appears to be derived directly from > the above:- > > chris@newdns$ more resolv.conf > # Generated by resolvconf > nameserver 192.168.1.4 > nameserver 8.8.4.4 > nameserver fd51:42f8:caae:d92e::1 > > The Raspberry Pi running dnsmasq is 192.168.1.4 on the LAN here, I'm > running dnsmasq version 2.76. Snippet from the dnsmasq manual page: -S, --local, --server=[/[]/[domain/]][[#][@|[#]] Specify IP address of upstream servers directly. Setting this flag does not suppress reading of /etc/resolv.conf, use --no-resolv to do that. > Would I be better with two unrelated DNS servers in the above > configuration, e.g. a Google one and one from my ISP? > > Regards Geert Stappers -- Silence is hard to parse ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
[Dnsmasq-discuss] Rather basic question - how do you tell dnsmasq what upstream DNS servers to use?
I'm feeling really silly, I've been using dnsmasq for several years running it on a dedicated Raspberry Pi on the LAN to provide local DNS. It's been working perfectly OK but just a very short while ago the Google DNS server at 8.8.8.8 went down for a while and it's what I (appear to) use as the upstream DNS. How and where does one set dnsmasq's upstream DNS? Is it the following line in /etc/dhcpcd.conf :- /etc/dhcpcd.conf:static domain_name_servers=192.168.1.4 8.8.8.8 fd51:42f8:caae:d92e::1 The file /run/dnsmasq/resolv.conf appears to be derived directly from the above:- chris@newdns$ more resolv.conf # Generated by resolvconf nameserver 192.168.1.4 nameserver 8.8.4.4 nameserver fd51:42f8:caae:d92e::1 The Raspberry Pi running dnsmasq is 192.168.1.4 on the LAN here, I'm running dnsmasq version 2.76. Would I be better with two unrelated DNS servers in the above configuration, e.g. a Google one and one from my ISP? -- Chris Green ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
