LAN to LAN on different interfaces

Hi community,

I am new to XG V.18 and having a understanding deficit on terms bridge, gateway, VLAN and IP objects.

Concrete:
Subnet A 192.168.80.0/24 on interface 4.
Subnet B 192.168.100.0/on interface 5.
Client 192.168.100.20 in Subnet B should use DNS Server 192.168.80.1 in Subnet A and route to the internet when retreiving an external IP address from DNS Server.

Any help will be appreciated.

Regards