my network is look like this dsa-3100-->dfl-800-->switch-->servers and client PC
my problem is how do I port forward a server or a client PC which are is inside in my network which I want to access outside. I already port forward the machine in dsa-3100 before and I can access it outside, but when I put the dfl-3100 after my dsa-3100 I cannot access the machine at all. Please Help.