Preconditions:

1. Setup zabbix agents on local computer and virtual machine
2. Create action to add discovered host when Discovery status equals Up
3. Create network discovery with check on IP address
4. Add discovery check Zabbix agent "agent.hostname" and suitable port range for both agents
5. Discovery uniqueness criteria is agent.hostname

1. Agents have different ports, but the same Host names

Steps to reproduce:

1. "Hostname" and "ListenPort" of the two different agents should be different
2. Start servers and agents
3. Make sure that discovered two hosts
4. Change "Hostname" so that it matches the second agent "Hostname"
5. Delete discovered hosts in UI and restart agent
6. Wait until the hosts are discovered again

Result: Two hosts are created
Expected: Only one host is created, but with two interfaces (because host names are equals now)

2. Agents have the same ports, but different Host names

Steps to reproduce:

1. "Hostname" of the two different agents should be identical
2. Start servers and agents
3. Make sure that discovered one host with two interfaces
4. Change "Hostname" on one of the agents
5. Delete discovered hosts in UI and restart agent
6. Wait until the hosts are discovered again

Result: One host is created with two interfaces
Expected: Should discovered two hosts because host names are different now