I have a 1.0ghz AMD Duron CPU with 768megs SD-RAM PC-133 I don't know the motherboard but I believe it is MSI. But anyways that may be irrelavent to this issue. That said machine was running windows 2k3 Server with NAT/Basic Firewall, IIS, MySQL. The other day my internet went down, but the satilite modem was still on and working, Hooked in my laptop and I had internet. I couldn't ping my server. Normally the server is headless so I hooked up a monitor, keyboard & mouse. I saw the login box as normal, try logging in and the server rebooted. While it was booting back up it crashed again. After yanking the hard drive and putting it in my desktop for analysis I saw that 90% of my windows directory on server hd was gone, with a text file in the root of the drive saying "Your f*cked" They didn't delete any log files and they were still there, Checked them and found some discrepancies in it. But I didn't save the logs (I know I should have).
Anyways I put the HD back in the server and was going to load Win2k3 back on to it. But I decided to load linux on it instead. (So thus is why this topic is here)
After 4hrs of messing around / reinstalling ubuntu twice I finally got the server back to sharing the internet. But when I go to a site like GCR and use there shields up service it says my firewall has failed and all the ports minus 3 are open.
So long story short, Win2k3 exploded (well died), loaded ubuntu linux on the box, and I want to lock down the firewall so it is similar to the following
Default deny all from internet
allow normal Web ports out so I can browse the internet and download updates etc.
allow all internal (lan can access server no issue)
Also this computer has two NIC's for the task. And before any of you tell me to go and by a router. I AM BROKE. I have no money for a router, and besides this computer has been running fine for the past couple of years at this task, And I usally reinstall win2k3 every year or so. (don't ask me why just habbit now I guess)