I got a Cisco 831 router running IOS 12.4. Physically there are 5 ports which are 1 WAN (E1) and 4 LAN (FE1, FE2, FE3, FE4).
When I "sh run", it shows up 7 interfaces. Besides the above 5 ports, there are E0 and E2. And my understanding is E0, E1, E2 are Layer 3 interfaces. FE1-FE4 are Layer 2 interfaces. And FE1-FE3 access E0, FE4 accesses E2.
My need is like this, in my LAN subnet(192.168.1.0/24), I want FE1-FE4 are in the same subnet. Say FE1 is connected a PC(192.168.1.1), FE2=192.168.1.2, FE3=192.168.1.3, FE4=192.168.1.4. E0 interface is configured as 192.168.1.5 for the router itself.
How can I make FE4 in the same LAN? I didn't find VLAN commands so I'm assuming 831 doesn't support VLAN, otherwise I would config VLAN for FE1-FE4.
Any suggestion is appreciated!