7/4/2023 0 Comments Unbound dnsTo restore your privacy and to promote internet neutrality, one option is to install your own DNS resolver like unbound. In addition, if a hacker is able to substitute the IP address a website name points to, you will reach the hacker's server without knowing it. In some countries, it is a way to apply censorship. It might bring some concerns regarding data privacy and bandwidth control. Your ISP DNS server should have also some other DNS servers in the cache to speed up the domain name resolution.īy that, all the websites you visit will be known by your ISP. In addition, your ISP usually provides its own DNS server to start the name resolution process above. It will then slow down the process, even if it is usually rather quick. Querying the root server will come first and it might not be enough to resolve the IP 2 more servers (Top Level Domain server and Authoritative server) might have to be involved in the sequence. find the IP of the machine hosting this website. When you ask to connect to a website, you will need to resolve the name i.e. There are also "copies" spread across the world as clusters, increasing the total number to about 1400 servers. Without entering into details, this limited number is connected to the way IPv4 works. There are thirteen servers worldwide (called root servers) to cover the first level of this tree. Internet domains are sliced in a tree structure and there is a server hierarchy to drill down into it. The "phone directory" of the internet is called Domain Name Server (DNS). ![]() Version 1.4.21 comes pre-configured with support for it, but if you are running the older version you'll probably want to add this into nf (just after any local-data declarations) include: /etc/unbound/local.d/ads.Like the old times when we had a phone directory book, the internet needs a way to link a website name to its IP address.Īs you might know already, any machine has its own IP address to identify it.Īs it is easier to remember a street name than GPS coordinates, it is easier to remember a website name than its IP address. One issue I did find with using this mechanism is that Unbound V1.4.17 doesn't seem to include (or support) a wildcard include of files in local.d. The autolist is refreshed regularly from and any of the domains that are blackholed as a result of that list will resolve to 127.0.0.2.Īdd it as a cronjob to run at whatever interval you desire, or run it manually periodically. With a simple BASH script, you can pull down a blocklist and generate the local-data entries #!/bin/bashįor a in `wget -O - ""` do echo " local-data: \"$a A 127.0.0.2\"" > ads.conf done Using Unbound, you can easily blackhole the ad serving domains (albeit network wide), but given the number of domains in use it's not something you really want to be doing by hand. On my phone, though, I can't abide them, especially those that insist on popping up in the middle of a game, just as you're touching the screen. When using my PC, I've no real problem with seeing ads, there's plenty of real estate to use and they help offset the cost of providing content for free. If you really need to have your local DNS server resolve the CNAMES, the trick is to configure BIND or NSD on another port and create a stub-zone within Unbound. Still, if you want to add a CNAME anyway, then you can do this local-data: "computer1 CNAME " ![]() The only time your entry will be returned is if the client queries for a CNAME, which in practice means it'll probably be returned quite rarely If a client makes a query for an A record they won't receive the CNAME in response. You can add a CNAME entry in local-data, however as Unbound isn't an Authoritative resolver it won't expand it. rather than running a DNS query for, you're asking for the hostname of the machine at 10.0.1.8) local-data-ptr: "10.0.1.8 " So in this post, I'll give a very brief overview.Īll changes should be made in an unbound configuration file (probably /etc/unbound/nf, though you could also put them into a file in local.d, depending on your distribution - see below)Īssuming we want to add an A record for '' which has an IP of 10.0.1.8 local-data: " A 10.0.1.8"Ī PTR record (sometimes known as a reverse DNS record) allows you to request the hostname used by an IP (i.e. When I wrote my post on configuring DNS, DHCP and NTP on a Raspberry Pi, I forgot to include information on how to add your own DNS records to Unbound (straight forward as it is).
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