Beginner needing help again with ip address config in my cisco 1841 router

[The51stAgent]

Hi folks. I have a cisco 1841 router and this is my setup:

patch cable from my ISP router to fa0/0 of my cisco router.
fa0/0 = Internet address is 192.168.1.116/24
Broadcast address is 255.255.255.255
Address determined by DHCP from host 192.168.1.1

For fa0/1, I want to configure this port to be active so I can plug a host in to it, but when
I try to configure it to any particular ip address, I get this error:

" % 192.168.1.0 overlaps with FastEthernet0/0"

I guess I still don't have a solid enough grasp on subnetting. Can anyone tell me what I
should input for configuring fa0/1? Like what IP and subnett would work? Or can someone give
me an example of what I need to configure both fa0/0 and fa0/1 to be so that I can have
fa0/1 active and ready for a host?
Thank you,

[luis_cordova]

Hi @The51stAgent ,

Two interfaces of the same router can not have IPs of the same network.

In your F0/0 interface you have IP 192.168.1.116, which is part of the Network 192.168.1.0/24.

This network includes all this segment: 192.168.1.0 - 192.168.1.255.

Therefore, the IP 192.168.1.1 that you try to configure in the F0/1 interface returns an error.

To avoid this error, you can occupy in F0/1  a network that is not in conflict with the F0/0 network, for example:

Network: 192.168.0.0/24

Hosts: 192.168.0.1 - 192.168.0.254

Broadcast: 192.168.0.255

or

Network: 192.168.2.0/24

Hosts: 192.168.2.1 - 192.168.2.254

Broadcast: 192.168.2.255

Remember to mark the correct answers as solved, since that helps other users with similar doubts

Regards