Configuring LANs and WANs in the same network

[tbasi19]

I've been given a set of IP addresses and subnet masks for each LAN and I want to connect these altogether. 

However I've also been given a WAN IP network address and WAN subnet mark to connect particular LANs together:

^ required to connect these LANs: 

Each cloud (LAN) is connected with serial DCE cables from their router console port and their interface statuses are up. 

The trouble is I'm not sure how I'm meant to be setting IP addresses and subnet masks that overlap eachother to be recognised as a LAN but also recognised as part of another WAN. How would I go about doing this in packet tracer?

Many thanks,

[luis_cordova]

Hi @tbasi19 ,

As I understand it:

Each cluster has its own IP address assignment for its internal networks:

Now, the connection between cluster 4 and 5 is signaled and corresponds to the connection of your total LAN with the ISP, being part of that network your public IP.

The networks to connect the other clusters, which, although they are separate WANs, are still part of your total LAN, they must be subnetted from the indicated network. You can achieve this by subnetting 3 subnets, for example:

1 to 2: 186.48.192.0 255.255.255.0

2 to 4: 186.48.193.0 255.255.255.0

4 to 3: 186.48.194.0 255.255.255.0

I hope that you find it useful

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

Regards

[tbasi19]

I'm not sure how you got these answers:

1 to 2: 186.48.192.0 255.255.255.0

2 to 4: 186.48.193.0 255.255.255.0

4 to 3: 186.48.194.0 255.255.255.0 

I'm new to Cisco and only in my first year at university so I haven't covered a lot in networking yet, could you please show me how you figured this out?

Many thanks 

[luis_cordova]

Hi @tbasi19 ,

I try to help you with that:

In the WAN network specifications you were given the network 186.48.192.0/21 to subnet the necessary networks for the connection between the clusters of your LAN.

In binary this would be like this:

10111010.00110000.11000|000.00000000

The line | indicates the first 21 bits, as indicated in the network mask /21.

That line also separates the network portion and the host portion.

To connect the clusters, you need 3 different networks.

To get 3 subnets out of the network they gave you, you need 2 bits of the host portion.

I'll show you 3 examples in which these subnets can be:

Example 1

10111010.00110000.11000|00|0.00000000 = 186.48.192.0/23

10111010.00110000.11000|01|0.00000000 = 186.48.194.0/23

10111010.00110000.11000|10|0.00000000 = 186.48.196.0/23

Example 2

10111010.00110000.110000|00|.00000000 = 186.48.192.0/24

10111010.00110000.110000|01|.00000000 = 186.48.193.0/24

10111010.00110000.110000|10|.00000000 = 186.48.194.0/24

Example 3 (point-to-point network)

10111010.00110000.11000000.0000|00|00 = 186.48.192.0/30

10111010.00110000.11000000.0000|01|00 = 186.48.192.4/30

10111010.00110000.11000000.0000|10|00 = 186.48.192.8/30

Regards