Hi,

Have anyone tryed to get working HA dude server?

What i expect from this is 2 dude servers in different network parts, both monitoring all network and somehow synchronize between together.

I now have one dude server but time to time some link to dude fall down, and in that time I have 600 messages in my mailbox saying there is some outage
Or is it possible to set dude if some large number of devices go offline to send just one email instead of 600 emails?

thx for help

What is the failure that causes the dude to report these down? is it an actual failure or the dudes internet connection failing?

Just set your internet-link (and the hops to your monitored devices) as parent of your clients.
So you just get a notification of the device change from your parent.