Zyxel USG40, sometimes the CPU load reaches 98%, what's the problem?

Question

network hardware

Sometimes the load reaches 98% and the network starts to slow down, what's the problem? where to look?

Answer 1

In vain they write here that telepaths are on vacation. :)
I look into the crystal ball, and I see you have VPN on ZyXEL there, right?
And then I look here: https://habr.com/ru/company/zyxel/blog/428477/
and see in the comments:

The traditional topic is that datasheets indicate one VPN performance, but in real conditions we have almost 3 times less. Illusion, practically. And measurements for the datasheet are made for UDP (which, IMHO, you can use for a VPN connection only from worldly boredom), and at a certain packet length. Offers of technical support make you wonder if she lives in a parallel world.
PS Yes, yes, we are talking about USG60 / USG310.

And then I also look at the specification https://www.zyxel.com/ru/ru/products_services/Unif...
and see that USG40 is almost 2 times weaker than USG60 . And there in the comments they swear at the low performance of the USG60 . So don't be surprised, that's how it should be.

Answer 2

Sometimes the load reaches 98% and the network starts to slow down, what's the problem?

Judging by the description, the problem is in the constellation of Taurus, it always affects digital technology at the end of January.

where to look?

Obviously on the web face, if there is one. If not, then open the instructions for the device and look, and then ask a question here with comprehensive information. Telepaths on vacation.