FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
Article Id 230121
Description This article describes that FortiGate can only allow a maximum of 32 secondary IP addresses per interface.
Scope FortiGate.

Sometimes, FortiGate needs to apply multiple secondary IP addresses, especially in the cloud environment.


A maximum of 32 secondary IP addresses can be created for each interface.


The message 'Command fail. Return code -4 (reached the maximum number of entries)' will appear if more than 32 are added.


Enable port forwarding if there are more than 32 internal IP addresses to map.