Re: Why is SRX not respecting static ip allocations?
The SRX DHCP server only knows what pool you gave it to use for addresses. It does not have the probe before issuing option. So you have two options when you want to assign a static address inside the range you already configured for the SRX DHCP server.
Recofigure the range to exclude the static address
Assign the address to the devices mac address via static reservation. Here the DHCP server will only give that address to the assigned mac address so it will no longer be used.