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I am looking for no install firewall.
Shades:
I totally concur with f0dder (and Carol), which is the reason I mentioned the IP tables thing. With that you can (dynamically) filter out whatever kind of packets you like from the incoming and/or outgoing traffic.
Although you have to be careful when configuring, it will increase your safety if it is properly setup. The bonus is the traffic shaping, that also reduces the "noise/chatter" on your network.
Personally I have a hard time believing it, but when I copy stuff from my personal system to my linux (samba) backup server using Total copy (explorer extension) it reaches a speed of 12Mbyte/sec through my 100Mbit network. Vice versa it goes to 10.5Mbyte/sec.
kartal:
Thanks guys. I will check out additional bioses for my router to see if any custom bios offer extra security and firewall.
Carol Haynes:
Routers don't have to be expensive and the technology is improving all the time. If you can't get a BIOS that serves get a new router - you may even be able to get one free or discounted from your ISP! (At least lots of UK ISPs provide routers).
40hz:
You can always bop over to www.grc.com and run the well known ShieldsUP to see what ports are "open" on your current setup.
ShieldsUp is probably more entertaining than useful, but at least it will give you some general insight into what ports do what if you're new to the firewall game.
If you're really paranoid, and you don't mind a little tinkering, you can roll your own industrial strength firewall/router combo by taking a look at any of the following. They're absolute overkill for a home network (and they suffer from the same security weaknesses discussed above) but they are available if you want to further your own education.
SmoothWall http://smoothwall.org
PFSense http://pfsense.org
m0n0wall http://www.m0n0.ch/wall
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