hello, dude use a long time, and never had problems, so that a few days to ca, walk with a strange problems. my problem and the following:

I monitor the transfers of data in several links by snmp, several times this information disappears, as if the link was the fallen and some routers accuse dns problem. more such information is untrue, because everything is still functioning normally, dns, routing, link. ie it has an apparent breakdown in snmp, and after a few seconds back to normal. someone has the idea is that?

If you go into settings "SNMP" verify that your timeout for each community string is set to no more than 5000 ms. I found that if I set it above that some link graphs don't look like they are collecting (although looking at the graph later it is corrected).

There are two issues I have seen here, The above one and when you set the SNMP timeout for the max 10000 ms. With SNMP timeout to 10000 ms there are actual gaps in the graphing. I don't know which of the two you are seeing although it sounds like the former.

What are your SNMP timeouts set to?

where I choose the time of snmp? I looked for this option here could not find more

Settings, SNMP tab, each snmp community name has a timeout inside it, bottom of the profile, try timeout.

3000 minutes my snmp settings

That is 3000 ms or 3000 miliseconds or 3 seconds.

Did you also say that DNS fails?

Have you restarted the dude? Sometimes just restarting the service or the server will clear up false positives.

following picture of it to my settings and log problems, I say, there is no problem of dns, routing, or flashes on the network, it's all normal, and the dude is accusing dns problem. already remade the dude from scratch, and yet the problem continues