I have a CISCO 5500 Firewall and it already has 2 networks connected: one connecting to the internet and the other one connecting my private network.
I have now connected another network on one of the interfaces but I am unable to enable communication between the new network and the existing private network. I have tried following Cisco instructions on how to allow inter-interface traffic but so far I have been unsuccessful. Is it to do with NAT-ing or something? Kindly assist.