How to configure activecheck in zabbix?

Question

linux

I use Zabbix 2.2.6 and for some clients the resources for monitoring are located behind NAT, i.e. they see the zabbix server, but the server does not see them. I went through quite a lot of info about this, but I can not find an understandable man for setting up such clients (agents). Prompt a configuration for the server and for agents.

Answer 1

And in general these clients are available? Pings go to them?
Clients must have an IP. And it must be accessible from the ZABBIX server. If pings go, but ZABBIX (server) does not see clients - see what you have on the firewall. Surely there is a ban.