Packet Filters, (Stateful and stateless) and proxy?

Hi all. I am researching firewalls etc, and I was wondering if anyone can tell me the difference between that of a (Static)Packet Filter and a Stateful Packet Filter and what features are included in a stateful packet filter, and why do people use stateful on servers such as webservers over that of a proxy firewall?

Also if possible, as I am having a hard time finding out, why is it that proxy firewalls are generally slower than that of a packet filter, is it because it always inspects right up to the paplication layer ?

If it is that, could you explaint to me why that takes so long in regards to just the transport layer for ports?

Also, in regards to stateful, they inspect upto the application layer too, so why use these? It will just increase the load won't it

Regards

DislexiK

 

 

 

 

Top