| Description | This article describes the reason for the error message 'IP address is illegal' when setting an IP address for the interface. |
| Scope | FortiGate. |
| Solution |
FortiGate will give an error message 'IP address is illegal' if the network ID is applied as interface IP.
For example: FortiGate interface port4 needs to be configured with an IP address from the 10.10.10.0/24 network, where 10.10.10.0 is the network ID and 10.10.10.255 is the broadcast ID for the network.
If the IP for the interface is pushed as 10.10.10.0/24, FortiGate will give an error 'IP address is illegal' in CLI:
F1 # config system interface F1 (interface) # edit port4 F1 (port4) # set ip 10.10.10.0/24 value parse error before '10.10.10.0/24'
In GUI, FortiGate will give an error with the message 'Invalid IP Netmask':
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