What free software would you recommend for monitoring network status?

Question

Monitoring

Good afternoon.
Share who uses what network monitoring system? There are a lot of remote points, a monitoring system is needed - are remote hosts-routers alive, for example, by ping, and when the link falls for a time interval - it sends an email (it has its own mail server). Now I use PRTG (monitoring works fine) - but I've already killed a day, I can't make friends with the mail server and notifications don't work.
Thank you.

Answer 1

Try Zabbix.

Answer 2

Friendly Pinger :-)
an old program, but simple and easy to configure, it sends notifications of events to the mail

Answer 3

There is also lanstate for monitoring and maps. You can ask them for a free key, it seems, for 10 hosts, if your network is small

Answer 4

argus.tcp4me.com A
super thing, it can do a lot, but there is a BUT and I ran into it. I can't pick it up, but the docks are 0

Answer 5

Nagios