SRX5308 - Multi-homing / Connecting subnets

Have you, by any chance, configured VLANs on that SRX? In my experience, just configuring the "multi-homing" allows communication between the subnets. If you have configured VLANs, you need to enable interVLAN routing. You can also try creating a static router - which in my opinion should not be necessary, as soon as you add the secondary address, the router should automatically "learn" the routes to directly connected networks. A few more points ... First - you're using a class a private address range, it's theoretically impossible to exhaust the DHCP scope, assuming it has been properly configured, a class a network can have over 16 Million hosts, and there would be no need for supernetting. Second - how are you trying to reach the servers? Have you tried pinging them by ip address? If you subnet a class a down to a class c, which is what I suspect you are doing, you may run into an issue where NetBEUI name resolution fails because they can no longer communicate with each other via broadcasts. There comes a point when it becomes necessary to really understand how a network functions, and when you have more than 254 hosts on a single LAN, I think you're long past that point. Allowing a small network to just grow rather than planning for that growth is a ticking "time bomb", either seriously consider getting some networking education, or hiring someone who already has.