Trouble Connecting PS3 to Internet

OK, I have a DSL modem I use for my internet. In the past I had to unplug the ethernet cable coming from the modem to my computer to use the internet on my pc, or unplug it from the pc and into the ps3 to get online with the ps3. And that all worked fine but it was a pain to keep switching it.

So I got an ethernet hub, so I plugged the ethernet cable coming from my modem into the hub. Then connected both my playstation and my pc to two open ports. The PC had no problem immediatley connecting to the internet this way. The playstation however, would not connect at all.

I tried following a step by step guide to setting up a wired connection and after I did that it worked for a little while, I was able to connect and set up an account with the playstation network and I thought all was fine. Then the system was turned off and back on again and now I am having the same problem, no internet connection. I tried repeating the process I had before and it didnt work, it didnt even let me get to the same screens in the setup as I had before.

I'm extremely frustrated, can anyone give me any insight into this problem?