GNS3, question about ip addressing and subnets

[tiagooliveira95]

So I have a project assignment that consists of 3 routers, the ISP, and 2 company routers, the ISP can address a set of /24 IPv4 IPs.

I delegated a /25 to DNS servers and a /26 to both company servers.

On the company server, I was trying to subnet the /26 into 3 networks for each department but looks like I'm doing something wrong.

F1/1 is connected to the ISP with an IPv4 of 212.199.4.130/26

I thought that I could set the other interfaces as

F0/0: 212.199.4.129/27

F1/0: 212.199.4.160/28

F0/1: 212.199.4.176/28

But if try, it tells me that there's an overlapping error.

Im not sure what I'm doing wrong here, any help would be appreciated

[luis_cordova]

Hi

The IP address assigned on the F1/1 interface spans this range of addresses:

Network:212.199.4.128/26

Range: 212.199.4.129-212.199.4.191

As you can see, the IPs assigned to the other interfaces are within the network range of the F1/1 interface, so the device indicates overlap.

Regards

[luis_cordova]

Hi

The correct assignment of IPs would be this:

Network: 212.199.4.128/26

Range: 212.199.4.129-212.199.4.191

Network: 212.199.4.192/27

Range: 212.199.4.193-212.199.4.223

Network: 212.199.4.224/28

Range: 212.199.4.225-212.199.4.239

Network: 212.199.4.240/28

Range: 212.199.4.241-212.199.4.255

Regards

[Hilda Arteaga]

hi @luis_cordova thanks for helping to answer this question 

We hope @tiagooliveira95 this information is helpful