How to access an adsl modem/router in bridged mode? [closed]

My home network connects to my ISP through an ADSL modem/router in bridged mode. I have the following setup:

|
ADSL modem/router, bridged mode
|
| x.x.x.x public IP on WAN interface
Router with DHCP server
|192.168.0.1
|
LAN and WLAN

several devices with dynamic IPs 192.168.0.100 - 192.168.0.200

In this setup I can't access the web interface of the modem/router, since it has no IP. If I assign it a static IP 192.168.0.5, it's not reachable. If I assign it a static IP 192.168.1.5 with netmask 255.255.0.0, it's not reachable either. I suspect the router wraps all packets to foreign IPs and sends it over the modem/router-bridge without ARP'ing the network at the WAN interface of the router.

Now I make a connection between the Router LAN interface and the Router/Modem LAN interface, between point X1 and X2. This occasionally works, but sometimes it happens that the router gets an IP of its own DHCP server, the network ends up in infinite recursion of packets,... All understandable in this setup, BUT I can access the modem/router web interface.

|
ADSL modem/router, bridged mode
|192.168.0.5
|
|----------...X1
|
| x.x.x.x public IP on WAN interface
Router with DHCP server
|192.168.0.1
|
|----------...X2
|
LAN and WLAN

several devices with dynamic IPs 192.168.0.100 - 192.168.0.200

First of all, the ADSL modem would need a static IP address that is on a different subnet than the internal side of the network, so something in the 192.168.1.x range would work. The netmask should be 255.255.255.0. All of the clients on the inside of your network (192.168.0.x) also need netmasks of 255.255.255.0. I would think that this setup alone should work. From what you have described, we have a setup exactly like this, which works well.