19103cd345
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.
2.1 KiB
Manage DNS and DoH servers from netwatch
ℹ️ Info: This script can not be used on its own but requires the base installation. See main README 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, ame=nextdns, 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!
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. 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.