In reply to a post by Pheasant:

Speed testing to .ch isn't going to be ideal, although testing via Wifi will of course be the biggest potential blocker...

I get full speed on BT 80/20 but agree that wifi is the issue here most likely.

I am trying to set up a Zabbix server running on my Qnap NAS and am hoping I could get a little help setting up SNMP monitoring. I am right at the outer limits of my 'skills' here...

I have everything working, information is being displayed in the Zabbix dashboard. I used a template I found online (https://github.com/bitfinity-nl/zbx-draytek) which is great, but I don't think it covers the OIDs I need per this document - https://www.draytek.com/support/knowledge-base/5517.

Am I correct that, in order to test the latency, I need to include OIDs from the ICMP section, 1.3.6.1.2.1.5.x? If so, is it as simple as cutting and pasting the XML and making changes to the tags where required? Or am I missing the point completely?

Help would be greatly appreciated, I have the bit between my teeth and don't want to let go!

1.3.6.1.2.1.5 is the ICMP MIB. It *won't* tell you anything about latency. It just counts the number of ICMP messages sent and received by the router. See https://datatracker.ietf.org/doc/html/rfc4293#sectio...

Measuring latency needs to be done with active probes. Some routers can do this, e.g. Cisco has a feature called ip sla. I don't know if the Draytek has a similar feature, but I think it's unlikely.

You'd probably be better off running some latency-measuring tool directly on your monitoring host.

Edited by candlerb (Thu 18-Nov-21 09:03:25)

In reply to a post by nieldm:

Help would be greatly appreciated, I have the bit between my teeth and don't want to let go!

So you are measuring the result but not treating the cause??
Every test has shown the same symptoms no?

I would be looking to measure CPU usage if possible to eliminate that.

Edited by smouty (Thu 18-Nov-21 08:45:16)

As I said, I am at the outer limits of my knowledge here, hence me asking for some guidance although I am aware many of you have given me more than enough help already!

CPU usage, as far as I can see, isn't an issue at all. It's typically in single figures and I have never seen it above 30%. That said, it is something Zabbix can monitor and graph over time, so I will keep and eye on it.

What do Draytek support say about this? If they’ve de-prioritised ICMP response, then no amount of spare CPU cycles will help.

They're unlikely to *delay* ICMP responses. But the yellow line shows 99th percentile, and I suppose it's possible it's going to sleep for 200ms now and again.

There aren't any power-saving features that are enabled, are there?

A firmware update and a full reset back to scratch may resolve matters.

That's not a bad idea, will give that a try.

So i had a chance to do precisely this, a PPPOE connection to my Macbook. The results here:

https://www.thinkbroadband.com/broadband/monitoring/...

...are interesting. For some reason I couldn't keep it stable hence the red parts but the results on the right show the times it was connected to the laptop. It seems the Draytek may well be at 'fault' in some way. I asked on the Draytek forum and the people there seem to think that ICMP de-prioritisation is a myth, but as they said, they don't have the source code.

I have just done a factory reset and firmware reload....so let's see what happens.