So our old Globe Aztech Modem broke and had to be replaced with a new one. The Globe technicians changed it with a Prolink Modem Hurricane 5200 which does not offer and wi-fi support and only has a single lan port. This meant that we needed to attach a router to it so we can share the internet in the house.
We have a Linksys WRT120N router and the default answer of just plugging in the Globe Modem to the Internet port via lan cable would not work.
So after some googling, I came across this blog that had the instructions on how to do it. The instructions are for Linksys LWRT54G2 but I can confirm that it also works for Linksys WRT120N.
For posterity and in case there are others like us who have a problem with configuring their modem with Globe, just check out that link.