Network Planning

[jqureshi]

Hello Every1, I am a member of this forum. I am very excited to be a part of this forum. I am hoping to get help from you guys and share my expertise also.

Scenario: Internally, there are three networks (A, B, and C) with computers and a router (Router A, B, and C respectively) serving that LAN network. The organization has a central router (Router X) with an internal network connecting internal routers A, B, and C as well as providing a connection to the external world network.

Question: I have to select an IP address for the overall company. I am trying to draw a network diagram here that can help to solve this issue.
                                                             network A           subnet 1
                                            PC1                           PC2                               PC3
                                              |                               |                                   |
                                              –------------------------------------------------
        PC4 -------|                                                     |
                        |                                                  Router A
                        |                                                       |
network C          |----------------Router C----------------------------------Router X----------> To External Network                    
subnet 3            |                                                                  |                                            (Ignore)
                        |                                                             Router B
        PC5--------|                                                                  |
                                              ---------------------------------------------------------------
                                              |                           |                                |                        |
                                            PC6                        PC7                             PC8                    PC9
                                                                               network B, subnet 2

[jahonix]

The most important information is missing from your post:
How many hosts will there be in each subnet / in total?

And what do you mean by this:
@jqureshi:

Question: I have to select an IP address for the overall company.

The one external IP for your "router x"
Public or private subnet ranges for your subnets
…

BTW, how is this related to pfSense?
And your post would be better suited in the "General Discussion" forum than here at "Routing and Multi WAN" ...

[jqureshi]

First of all I wanna thank you for the quick reply. I appreciate it very much You asked about the number of hosts on each subnet (PC represents the hosts in each subnet.
As far as I know that you can connect two routers directly to each other but I am still confused with the figure.

Mr. Chris I am very sorry for the wrong posting I'll make sure next time to choose the right blog.

Regards.

[jahonix]

Of course you can connect routers that way.
In your scenario it could be much easier with one centralized pfSense and 4 NICs.

Where in your picture is the pfSense and which subnet do you need to figure out?