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Manage DNS and DoH servers from netwatch
========================================
[⬅️ Go back to main README](../README.md)
> ℹ️ **Info**: This script can not be used on its own but requires the base
> installation. See [main README](../README.md) for details.
Description
-----------
This script reads server state from netwatch and manages used DNS and
DoH (DNS over HTTPS) servers.
Requirements and installation
-----------------------------
Just install the script:
$ScriptInstallUpdate netwatch-dns;
Then add a scheduler to run it periodically:
/system/scheduler/add interval=1m name=netwatch-dns on-event="/system/script/run netwatch-dns;" start-time=startup;
Configuration
-------------
The DNS and DoH servers to be checked have to be added to netwatch with
specific comment:
/tool/netwatch/add comment="doh" host=1.1.1.1;
/tool/netwatch/add comment="dns" host=8.8.8.8;
/tool/netwatch/add comment="doh, dns" host=9.9.9.9;
This will configure *cloudflare-dns* for DoH (`https://1.1.1.1/dnsquery`), and
*google-dns* and *quad-nine* for regular DNS (`8.8.8.8,9.9.9.9`) if up.
If *cloudflare-dns* is down the script will fall back to *quad-nine* for DoH.
Giving a specific query url for DoH is possible:
/tool/netwatch/add comment="doh, doh-url=https://dns.nextdns.io/dns-query" host=199.247.16.158;
Note that using a name in DoH url may introduce a chicken-and-egg issue!
Adding a static DNS record has the same result for the url, but always
resolves to the same address.
/ip/dns/static/add name="dns.nextdns.io" address=199.247.16.158;
/tool/netwatch/add comment="doh" host=199.247.16.158;
Be aware that you have to keep the ip address in sync with real world
manually!
Importing a certificate automatically is possible, at least if available in
the repository (see `certs` sub directory).
/tool/netwatch/add comment="doh, doh-cert=DigiCert TLS Hybrid ECC SHA384 2020 CA1" host=1.1.1.1;
/tool/netwatch/add comment="doh, doh-cert=DigiCert TLS Hybrid ECC SHA384 2020 CA1" host=9.9.9.9;
/tool/netwatch/add comment="doh, doh-cert=GTS CA 1C3" host=8.8.8.8;
Sometimes using just one specific (possibly internal) DNS server may be
desired, with fallback in case it fails. This is possible as well:
/tool/netwatch/add comment="dns" host=10.0.0.10;
/tool/netwatch/add comment="dns-fallback" host=1.1.1.1;
Tips & Tricks
-------------
### Use in combination with notifications
Netwatch entries can be created to work with both - this script and
[netwatch-notify](netwatch-notify.md). Just give options for both:
/tool/netwatch/add comment="doh, notify, name=cloudflare-dns" host=1.1.1.1;
Also this allows to update host address, see option `resolve`.
See also
--------
* [Notify on host up and down](netwatch-notify.md)
---
[⬅️ Go back to main README](../README.md)
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|