This is the DMZ option, the modem is ancient and must be changed the firmware is usually messed up along with its updates. Anyways to use this feature you should assign the DMZed device a static local IP usually not within the DHCP range.StannisTheMannis wroteThanks for the reply, I have dd-wrt firmware installed on my router, so I set it to Automatic Configuration - DHCP, and it worked with the modem. I don't have a DMZ mode on the modem, I only have a "Assign the public IP address of a connection to a device" option. After adding the router to this option, a popup informs me "to release the current private IP address of the device and then renew the IP address to acquire a public IP address". The connection then drops and no longer works. Any idea on what is happening?wollyka wroteI used to have the same setup but i has to change it a little when i switched to VDSL because the new modem supplied by IDM doesn't have bridge mode. So now, I let the modem connect using pppoe and i put the router in automatic IP mode. Also i put the router in the DMZ zone in the modem settings.
Meaning if your range is 192.168.1.100-254 then pick 192.168.1.5 for example.