diagnosing slowness issues...

[nrf]

so I've had a couple cases of this since stepping up, rebooting didn't help, after the reboot I had to drop and restore the wan interface before it was 'ok'. Unfortunately, I"m not seeing anything on the dashboard turning red to tell me I can't get to the dns servers or there is high latency. And I'm not seeing any troubleshooting guide in the doc.

Ideally I'd like to be able to see response time for dns requests on a per server basis, with something turning red when that stops being timely, I am sure there are other things that could be read out given the router is in a position to observe everything...barring that, troubleshooting tips beyond 'reboot the modem reboot the router hope and pray'?

[franco]

Hi nrf,

There are a couple of hints on how to narrow down the scope:

https://forum.opnsense.org/index.php?topic=3039.msg9490#msg9490

Normally there is gateway monitoring, but that only uses ICMP, so you can see that your target network is reachable, but it may not be enough given the nature of your DNS-based request. There are really a number of ways to check for different health parameters, nmap might be a good tool to look into.

A plugin for nmap would be tremendously useful, though should also be a lot of work to get it just right with dashboard and all.


Cheers,
Franco