If you just want to communicate from the laptop to the linux box set like this....
Dreambox
IP: 192.168.0.1
Netmask: 255.255.255.0
Type: LAN
Nameserver: {Leave Blank}
Gateway: {Leave Blank}
Laptop
IP Address: 192.168.0.2
Subnet Mask:255.255.255.0
Default Gateway: {Leave Blank}
Preferred DNS: {Leave Blank}
Secondary DNS: {Leave Blank}
Remember, you won't be able to get access to the Internet via the settings above as there is no DNS/Gateway attached settings above.
I think you may need to explain alittle bit more exactly how you want things to be set up.
Bare in mind you don't use a crossover cable, you would need a straight through ethernet cable unless the ethernet ports are auto sence to detect if a crossover cable has been placed or a straight through.