more than 4 network interfaces

[Guest]

[civer]

Hi,
I need you to help me in this please.
I have an Endian with 4 network interfaces, all the interfaces configured on a different network. If I need to add an fifth interface, how I can configured it on a different network if I have not more zones available?

GREEN      E0:10.0.0.10/30
ORANGE    E1:172.20.141.1/24
BLUE         E2:172.20.143.1/24
      ?           E3:172.20.162.1/24

RED - DGw:10.0.0.9
DNS:172.20.64.100


I don't know when I use an Uplink, could someone tell me please?

Thanks in advance.