I know you are eager to resolve your configuration issues but I encourage you to read the setup description below. It will give you an idea how things work. When you have everything figured out, I’m quite sure that the step-by-step guide will be easier to follow.
Hardware Setup. Above is a picture of my rig. As you can see, there are no ethernet cable attached to my wireless router except for my NAS (Network Attached Storage). Also, I’ve crimped a shorter cable to connect the modem (Ethernet port in the modem) to the wireless router (WAN port in the router). To make everything tidy, I used a mounting tape to stick the modem on top of my router and placed the rig behind a huge speaker. So, far, I haven’t experienced heating of both the modem and router as well as degraded data transfer rates even when the speaker in turned on. As I have configured quite a few of this rig, I’ve seen a router (Wireless N from Encore) that I immediately attached to the modem and everything worked like magic. Good thing for me the configuration went well without a glitch. If that’s what happened to you, you have the option to use or not this guide. But if you are experiencing internet connectivity and port forwarding issues you may continue reading and try the steps below.
Hardware Settings. The trick in configuring Globe’s ADSL modem to work with any wireless router in the market is to configure the darn thing properly. That means setting up the modem to use UPNP, setup the DCHP server (modem) to bind with the machine ID of your router to gain a Class 0 Static IP address for your router, and finally add the routers WAN IP Address to DMZ. This way, you will have to do the port forwarding in your router, not with the modem. For the router settings, you have to setup a Static IP for the WAN settings and use 192.168.1.2 as the IP Address, 255.255.255.0 for the Netmask, and 192.168.1.1 for the Gateway and Primary DNS Server. As for the LAN settings of the router, use 192.168.2.1 as the IP Address and 255.255.255.0 Subnet Mask. And finally, you need to properly configure port forwarding in the router. This is for those you have special connectivity needs – p2p that is… 
Since the overview is done, it’s time to get to work. Now, I might not have presented everything clearly or even forgot some steps in this guide. If so, please post a comment in this blog entry. Everything is welcome here. Including comments in my grammar and typos.
Step-by-step Guide
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Connecting the devices
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You are almost done. What needs to be done now is to connect the modem and the router.
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Using the ethernet cable, plug one end to the router in the WAN port and Ethernet port in modem.
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Plug the DSL line in your modem. Plug the power lines.
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Turn both the router and modem on. Wait for the light to be green and that you have a steady green or blinking green light in the Internet LED indicator of your modem.
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Connect to your router either wired or wireless.
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If you have done everything correctly you should be able to surf the web. As for the port forwarding, tutorial, I guess I need to place it in a separate blog entry. It’s Christmas you know… I need to rest my fingers… LoL
Hope this helps! Cheers and Merry Christmas everyone!