Cannot add new external interface to the same ip range of Lan

Installing and Using OpenWrt
1

Hi
i did try to adding an extra lan port via an usb dongle. But what i cannot do is how to set this eth2 on the same ip realm as the main Lan eth1 ? I'm pretty sure we can assign different ip to any port...

Default install v23.05.2 : Wan (dhcp) and Lan 10.10.20.1 /28
usb-nic is: eth2

When i create an interface and set the usb nic with an ip like 10.10.20.5 it did not work. But if i put:

/etc/config/network
config interface 'nic25usb'
        option proto 'static'
        option device 'eth2'
        option ipaddr '10.10.50.5'
        option netmask '255.255.255.240'

i can ping directlty the other pc2 with a static ip 10.10.50.3.

I try to edit the Lan in Firewall Zone setting / advance setting and add the usb device to the Covered device. Then put pc2 in dhcp.. but nothing.

I try to set the eth2 as Unmanaged interface, and still set in the Lan covered device of the firewall zone = Not working.

Also, i never see either the eth2 info data over the Port Status or the Luci overview.

Thanks for letting me know what is missing or so..

2

If the interface is declared separately, you cannot have the same subnet - all interfaces must have different, non-overlapping subnets.

Instead, you use a bridge to put the two physical interfaces together into one logical device.

Let’s see your complete network config. We can advise specifics.

1 Like