Can somone please explain why I should use a third party firewall instead of the one shipped with win XP. What benefits or security enhancements comes with using Norton or some other firewall, wich you therefore will miss when using the XP firewall? Isn't the XP firewall secure enough?
Ok, because it only monitors inbound trafic for one.The average user with a bit of knowledge will start the firewall and believe they are secure. I tend to believe that no matter what, nothing is actually secure, their are only steps that can be taken to prevent something from happening.
for two, it has no idea about connection state, second, it is very limited in that it only allows for port and protocol filtering from the "outside" and not much else. It lends little control to properly secure your environment. It has no ability to track connection state, it has no concept of inside vs. outside, it is used for securing ports (and I use that term lightly), it cannot analyze packets thoroughly (other than the protocol), it has no protection for outbound connections and the list goes on. Do yourself a favor and look into something more robust. You'll be happier in the end. I'd look at IPTABLES in any distro, or look into an appliance like Cisco PIX, etc.
www.linuxiso.org
http://grc.com/x/ne.dll?rh1dkyd2
Another thing I would like to add to this discussion is that it doesn't report ports as 'stealth' instead it reports ports as 'closed'. Sygate reports all none used ports as 'stealth' for example.
If you use a nmap scan on it, whether it be a syn scan or one of the other scans., it reports the host as being 'up'.
Why is this bad ?
If a port is in the state closed and you send a packet to it it will respond to that packet. For example with a 'res' packet. The packets contain overhead that can give information on the system.
Another thing is that you get no information. It does not tell you what is happening.
And being unable to block outgoing connections is just plain bad.
In my opinion you can better use a (free) third party firewall like sygate, kerio or outpost ect.....
Remember to disable the built in firewall if you choose to use a third party one.