IP

“IPS” tab

MTU

Impose MTU limit (force fragmentation) MTU (Maximum Transmission Unit) represents the maximum size of an IP packet.
If this option is selected, the next field will be enabled and you can define your limit.
Maximum MTU value Define the maximum value of the IP datagram, between 140 and 65535 bytes.

Fragmentation

Minimum fragment size (bytes) The fragment must be between 140 and 65535 bytes.
Session will expire in (seconds) This period must be between 2 and 30 seconds.

Stealth mode

Enable stealth mode In stealth mode, the firewall does not respond to detection attempts - ICMP requests in particular - so that it appears invisible.
Stealth mode is disabled by default and can be enabled by selecting this checkbox.

NOTE
The IP protocol does not have a profile.