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https://github.com/eworm-de/routeros-scripts
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Starting with RouterOS 7.4 the netwatch tool has been extended, it can now do tcp and http probes. Rename the parameter for reasonable naming with services.
71 lines
2.1 KiB
Markdown
71 lines
2.1 KiB
Markdown
Manage DNS and DoH servers from netwatch
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========================================
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[◀ Go back to main README](../README.md)
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> ℹ️ **Info**: This script can not be used on its own but requires the base
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> installation. See [main README](../README.md) for details.
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Description
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-----------
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This script reads server state from netwatch and manages used DNS and
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DoH (DNS over HTTPS) servers.
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Requirements and installation
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-----------------------------
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Just install the script:
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$ScriptInstallUpdate netwatch-dns;
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Then add a scheduler to run it periodically:
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/system/scheduler/add interval=1m name=netwatch-dns on-event="/system/script/run netwatch-dns;" start-time=startup;
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Configuration
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-------------
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The DNS and DoH servers to be checked have to be added to netwatch with
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specific comment:
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/tool/netwatch/add comment="doh" host=1.1.1.1;
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/tool/netwatch/add comment="dns" host=8.8.8.8;
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/tool/netwatch/add comment="doh, dns" host=9.9.9.9;
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This will configure *cloudflare-dns* for DoH (`https://1.1.1.1/dnsquery`), and
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*google-dns* and *quad-nine* for regular DNS (`8.8.8.8,9.9.9.9`) if up.
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If *cloudflare-dns* is down the script will fall back to *quad-nine* for DoH.
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Giving a specific query url for DoH is possible:
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/tool/netwatch/add comment="doh, ame=nextdns, doh-url=https://dns.nextdns.io/dns-query" host=199.247.16.158;
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Note that using a name in DoH url may introduce a chicken-and-egg issue!
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Sometimes using just one specific (possibly internal) DNS server may be
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desired, with fallback in case it fails. This is possible as well:
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/tool/netwatch/add comment="dns" host=10.0.0.10;
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/tool/netwatch/add comment="dns-fallback" host=1.1.1.1;
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Tips & Tricks
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-------------
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### Use in combination with notifications
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Netwatch entries can be created to work with both - this script and
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[netwatch-notify](netwatch-notify.md). Just give options for both:
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/tool/netwatch/add comment="doh, notify, name=cloudflare-dns" host=1.1.1.1;
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Also this allows to update host address, see option `resolve`.
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See also
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--------
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* [Notify on host up and down](netwatch-notify.md)
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---
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[◀ Go back to main README](../README.md)
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[▲ Go back to top](#top)
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