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doc/netwatch-notify: hint on checking specific isp

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Christian Hesse 2021-07-05 14:56:51 +02:00
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doc/netwatch-notify.md
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@ -94,6 +94,23 @@ A target like this suits well to be parent for other checks.
/ tool netwatch add comment="notify, hostname=example.com, parent=internet" host=93.184.216.34;
### Checking specific ISP
Having several ISPs for redundancy a failed link may go unnoticed without
proper monitoring. You can use routing-mark to monitor specific connections.
Create a route and firewall mangle rule.
/ ip route add distance=1 gateway=isp1 routing-mark=via-isp1;
/ ip firewall mangle add action=mark-routing chain=output new-routing-mark=via-isp1 dst-address=1.0.0.1 passthrough=yes;
Finally monitor the address with `netwatch-notify`.
/ tool netwatch add comment="notify, hostname=quad-one via isp1" host=1.0.0.1;
Note that *all* traffic to the given address is routed that way. In case of
link failure this address is not available, so use something reliable but
non-essential. In this example the address `1.0.0.1` is used, the same service
(Cloudflare DNS) is available at `1.1.1.1`.
---
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