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How to design IP addresses assignments into my network.

Last Modified: 2013-11-16
Hello Experts,
I have Cisco 1841 router (2 fe ports) & Cyberoam(50ai) firewall with 6 Ethernet ports.
I am confused which all port I should use for my network & which IP addresses should I used to assign to which port. We have 1 pool of public IP in which we have 5 IPs.
Internally we would like to use network.
Have a look at my network diagram attached:-
One Ethernet port coming from Leaseline Router will go to Cisco router FE 0/0 & from Cisco one Ethernet end will start to end on one Cyberoam’s Ethernet port. Now how can I use other Ethernet ports on cyberoam to connect to my network?
I will be used the following device for my network:-
•      1 Nos. Lease Line Router with two Ethernet Ports
•      1 Nos. Cisco Router 1841
•      1 Nos. Cyberoam Firewall 50ai
•      2 Nos. Dlink PoE Switch 24 ports
Kindly advise how I can assign the IPs & Cyberoam Ports configuration appropriately.
An earlier reply will be appreciated.
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