Airport Express static IP configuration

My DSL provider, who placed at home a modem with 4 ethernet ports, does not have DHCP and gave me the following details: IP, Subnet Mask, Gateway (I’m presuming this is the Router address to be entered in Airport Utility), DNS and alternate DNS. I configured it as Static IP, and initially AirPort Express suggested that I put the router in “Bridge Mode” and pointed me to how I can change it. Now the router indicted green but Internet was still amber.

Following all this, when I tried connecting using my MacBook, I get the message that it has a “self-assigned IP and cannot connect to the internet”. I don’t know what to do to make it work.

I configured the same settings for the Ethernet adapter on my MacBook and I’m able to connect to the internet. I don’t know if this is helpful but thought I’d put all the information I have on the forum.

 

Works but doesn't work

Thanks for your reply. I switched out of Bridged mode into DHCP and NAT. This raised a Double NAT error from Airport. I broadly understood the logic that Airport has to act as the DHCP server and so I switched to DHCP only. This did the trick and now I'm connected to the internet! But, now it lets me access internet on only one device at a time.

See, when I log in for the first time, I've to enter a username and password to log into the ISP's gateway - much like in a hotel. But, the ISP guaranteed to me that I'd have to do it only once if I've a wireless router as entering it once on a device will keep the gateway open for other devices. Now, once I've logged into my MacBook I lose internet on my iPhone. Could this be solved somehow?