9/25/2023 0 Comments Local dns vs upstream dns nxfilter![]() ![]() It can serve the names of local machines which are not in the global DNS. I hope your not one of those down voting legit input/concerns in this topic, not sure what is going on here. Dnsmasq is a lightweight, easy to configure DNS forwarder, designed to provide DNS (and optionally DHCP and TFTP) services to a small-scale network. The steps taken by unbound will be shown in the log you have specified in the unbound configuration. Wait until the IP has exited cache, and query again. If you are running unbound, you can see this process in action. The new request will still be shown as a cache miss in unbound, but unbound gets the result quite quickly anyway. When the IP for the requested domain exits cache in 300 seconds, unbound will go back to the final nameserver and get the IP again (assuming it has not pre-fetched the IP already). Now Pi-hole has the info for the first two nameserver levels in cache for the next 24 hours. In the case of, the recursive process is shown here, for example: On the first recursive lookup with an empty cache, unbound traverses the entire process. ![]() If you look at the TTL's for the various nameserver levels, they are quite long (typically 24 hours). It only needs to go to one level in many cases. When a domain has left the unbound cache, that does not mean that to obtain that IP again unbound has to go through the entire recursive process again. Your local instance of unbound likely needs to go to a single nameserver for the same answer (again due to caching), which should take about the same amount of time. That is true, but there is also some delay in going out over the internet to get those cached results from the upstream DNS server. I hope this made it clear, feel free to ask if there are any questions left.It is way more likely for a bigger upstream DNS used by thousands of users to have your request cached than for a local one. So it is only possible to use the hostname within your local network, when you set your router to resolve them. In the old days, we don't give much attention to this problem as NxFilter is supposed to be in a local network. You can put it into /nxfilter/conf directory and set the filename as the value of 'keystorefile'. keystorefile When you have your own SSL certificate as a JSK file. For example, you run it on UDP/5353 and set '5353' as the value of this parameter. This is especially true when you put NxFilter on cloud. You can run a local recursive DNS server and use it as the upstream server of NxFilter. your NAS or your TV which you could want to address, and your ISP or any other DNS resolver won't know these, but your router does. Getting started GUI overview User authentication Preventing DNS attacks We see many kinds of DNS attacks to NxFilter these days. Second, there may be hostnames in your local network, e.g. ![]() The next occasion (within a specified time) a device on the network asks the router to resolve a hostname, it just returns the IP address it cached earlier which saves time. Now back to why it is useful to have your home router be the primary DNS server:įirst, it caches the IP addresses it had resolved by higher level DNS servers. Now if for some reason your ISP doesn't know the address either, it will ask the DNS server on the next level and so on. And I want to say that you probably should change that as many ISPs sell the data they collect about which websites you browse. Normally this is the DNS server of your provider, but you can of cause change that. If the router knows the correct IP for some reason (more on that in a moment), it directly delivers it to your computer.īut if it doesn't, it has to ask someone else itself. The next one to ask is usually your home router. When the hostname cannot be resolved by looking into this file, the computer needs to ask someone else about it. You can do some research for that if you want, it is quite interesting. Active Directory integration and single sign-on by Active Directory. IP or IP range based user authentication. Multiple filtering policies according to user and group. Some of these addresses are defined directly on your local machine, on windows this is done in the "hosts" file. Local caching DNS server to speed up your Internet connection. Your PC needs to resolve the website name into an IP address. ![]()
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