Can't forward ports with Cisco EPC3925 and Airport Express and Extreme!

Hello,
I have very big problem, I've been trying for whole day to forward ports for steam and I just can't I tried everything, I have Cisco EPC3925 ( Its main thing I think its router - right ? ) Then I have connected Airport Express to it with ethernet cable ( It's working as DHCP and NAT I have double nat issue in my airport program I don't know what is this ) also Airport Express is set to create a Wi-Fi network, then I have connected Airport Extreme with Wi-fi and set to exceed wi-fi network and can't change anything in it , can't open ports etc. etc. MY COMPUTER is connected to Airport Extreme ( 2nd device ) with cable ! So Im not connecting my computer to internet with wi-fi
Also I've been looking in Airport Express ( the 1st device ) and I saw that there I can open ports , but I opened them and nothing happend ... ports are still closed... Also I've set my computer ip to static , tried everything . And portforward.com site isn't helpfull . Also I tried to set Airport Express ( 1st device ) in bridge mode and nothing happend ( after I set it to bridge mode I can't open ports in airport program )
Please is there anyone that can Help me with this ????
Also I want to say that somehow I dont know how, but I managed to open ports in the past
I need to open all necessary ports because If I can't open them - I can't make a server and people can't join . I really really need help I've spent whole today's saturday to get it to work and this won't work !

Tesserax wrote:
I have Cisco EPC3925 ( Its main thing I think its router - right ? )
Yes, the Cisco EPC3925 is a combination modem and wireless router or gateway device. This is the device that you would need to configure for port forwarding/mapping.
Then I have connected Airport Express to it with ethernet cable ( It's working as DHCP and NAT I have double nat issue in my airport program I don't know what is this )
A "Double NAT" condition is when you have two or more routers in series where they all have NAT enabled. NAT is a service that is intended to allow you to share one Public IP address with multiple Private network clients. This is what allows you to have more than one computer on your local network have the ability to share an Internet access.
Since you have your AirPort Express connected to the Cisco by Ethernet AND the Express is configured to have NAT enabled is why you are getting a Double NAT warning.
Normally you would want all downstream routers to be reconfigured as bridges (NAT & DHCP disabled).
also Airport Express is set to create a Wi-Fi network, then I have connected Airport Extreme with Wi-fi and set to exceed wi-fi network and can't change anything in it , can't open ports etc. etc.
You will need to reconfigure the Express as a bridge. The fact that you have configured the Extreme to extend its wireless range is fine.
Also I've been looking in Airport Express ( the 1st device ) and I saw that there I can open ports , but I opened them and nothing happend ... ports are still closed
You do not want to open ports on the Express. Again, if you reconfigure it as a bridge you won't need to as all of its ports will be opened.
Ok I understand what u said, so I set my airport Express 1st device in bridge mode - if I do that I can surf internet without problems etc. Then when I set it to bridge mode my computer gets adress 192.168.1.X ( My computer gets 13 and I've set it to be static ) so my computer is 192.168.1.13 then -> I open ports for example 2700-27015 ( for steam ) in my router cisco website witch is 192.168.1.1 and in ip adress label I put my computer adress 192.168.1.13 after I do this I reset the router and turn it back on after all this everything should work fine and my ports should be open right?? Well..I've tried it.. after this I can surf internet without problems of course but my ports are still closed ... Im checking them on http://www.canyouseeme.org/ and it says they are closed I've tried with pultiple ports such as 80 .. and it just won't work I don't know why..
Also someone told me to use DMZ on and in ip adress put WAN ip of my airport express ( if its NOT set in bridge mode ) and open ports for my airport ( also I tried to open for my computer too ) - It doesn't work
Please friend tell me you can help me ..
Message was edited by: bolo822

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