The IP address of the gateway is entered here. It is located in the IP address range of the HS/FS.
The HS/FS reaches the specific target network via this address (see below).

Example: HS/FS IP address 192.168.0.11, Gateway address: 192.168.0.2

The IP address entered here is reached via the gateway (routed).
The host proportion of a network address always consists of zeros and can be identified in this way.
Example: 192.168.1. 0 (in the case of a net mask 255.255.255.0)

The target network is masked with this. E.g. 255.255.255.0