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112 lines
4.5 KiB
ReStructuredText
112 lines
4.5 KiB
ReStructuredText
==============
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DNSCrypt-Proxy
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==============
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------------
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Installation
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------------
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First of all, you have to install the dnscrypt-proxy plugin (os-dnscrypt-proxy) from the plugins view
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reachable via :menuselection:`System --> Firmware --> Plugins`.
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After a page reload you will get a new menu entry under **Services** for DNSCrypt-Proxy.
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When you start the daemon, it looks for a list of public DNS server from here:
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https://dnscrypt.info/public-servers
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Depending on all settings below the list will shortened to your choice, like only IPv4, or logging disabled.
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The fastest two servers will be used for DNS queries. If you use Unbound as your main resolver and want to
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send your queries to Unbound first and forward to DNSCrypt-Proxy, just set this in your Unbound Advanced
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settings:
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.. code-block:: sh
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do-not-query-localhost: no
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forward-zone:
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name: "."
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forward-addr: 127.0.0.1@5353
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----------------
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General Settings
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----------------
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:Enable DNSCrypt-Proxy:
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Enable and start DNSCrypt-Proxy.
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:Listen Address:
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Here you set the addresses and ports to listen on. Default is localhost and port 5353.
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If you want it to listen to port 53 you should enable **Allow Privileged Ports**, especially
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when the system itself should treat it as a resolver.
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:Allow Privileged Ports:
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This allows the service to listen on ports below 1024, like 53.
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:Max Client Connections:
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How many clients are allowed to contact the daemon.
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:Use IPv4 Servers:
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Use IPv4 enabled servers.
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:Use IPv6 Servers:
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Only use IPv6 enabled servers.
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:Use DNSCrypt Servers:
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Include resolvers supporting DNSCrypt protocol in the decision process.
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:Use DNS-over-HTTPS Servers:
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Include resolvers supporting DNS-over-HTTPS in the decision process.
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:Require DNSSEC:
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Only use resolvers supporting DNSSEC protocol.
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:Require NoLog:
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Only use resolvers with disabled loggong.
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:Require NoFilter:
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Only use resolvers without filtering. Otherwise requests would also filtered for adult content or ad's.
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:Force TCP:
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Always use TCP to connect to upstream servers. This can be can be useful if you need to route everything
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through Tor, otherwise keep it disabled.
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:Proxy:
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Use this to route all TCP connections to a local Tor node, format has to be like 127.0.0.1:9050
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:Timeout:
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How long a DNS query will wait for a response in milliseconds.
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:Keepalive:
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Keepalive for HTTP (HTTPS, HTTP/2) queries in seconds.
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:Cert Refresh Delay:
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Delay in minutes after which certificates are reloaded.
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:Ephemeral Keys:
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Create a new, unique key for every single DNS query. This may improve privacy but can also have a
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significant impact on CPU usage.
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:TLS Disable Session Tickets:
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Disable TLS session tickets - increases privacy but also latency.
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:Fallback Resolver:
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This is a normal, non-encrypted DNS resolver, that will be only used for one-shot queries when
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retrieving the initial resolvers list, and only if the system DNS configuration does not work.
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:Block IPv6:
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Immediately respond to IPv6-related queries with an empty response.
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This makes things faster when there is no IPv6 WAN connectivity.
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:Cache:
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Enable a DNS cache to reduce latency and outgoing traffic.
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:Cache Size:
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Set the cache size.
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:Cache Min TTL:
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Minimum TTL for cached entries.
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:Cache Max TTL:
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Maximum TTL for cached entries.
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:Cache Negative Min TTL:
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Minimum TTL for negatively cached entries.
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:Cache Negative Max TTL:
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Maximum TTL for negatively cached entries.
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-----------------------
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Example: Standalone DNS
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-----------------------
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You can use the DNSCrypt-Proxy as a full-featured standalone DNS instead of Unbound or Dnsmasq.
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This setup has the advantage that you do not need a forwarder solution for encrypting DNS requests
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or the usage of DNSBL.
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To do so go to **Services->Unbound DNS->General** and uncheck *Enable*. If you are using Dnsmasq
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go to **Services->Dnsmasq DNS->Settings** and uncheck *Enable*. Now change to **Services->DNSCrypt-Proxy->Configuration**
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and add your Local LAN IP address to the *Listen Address* field, e.g. 192.168.2.1:53.
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For IPv6 with dynamic prefixes you can work around this with ::1:53 as *Listen Address* and add
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a Port Forward rule, matching every IPv6 UDP traffic, port 53, redirect to ::1.
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Optionally you can set :53 to listen on all addresses like the default behaviour in Unbound.
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Now you can go on with your configuration task, like choosing which servers to use, privacy policy or caching.
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Also cloaking (overrides) or DNSBL can be used without any workarounds.
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