Re: Stateful and stateles

Kostantino wrote:
> Where is the difference between Stateful and Stateles Inspection?
> I'm a newbie of networking.
> Thanks.
> 
>    Costantino (Italy)
> 
> 
http://en.wikipedia.org/wiki/Stateless_firewall
http://en.wikipedia.org/wiki/Stateful_firewall


An example of a stateless firewall is a broadband DSL or cable modem 
that blocks port 80 inbound to keep anyone from running a web server 
behind it.

It doesn't care *who* sent the traffic, or *why* they sent it, it just 
drops all inbound port 80 traffic.



A stateful firewall example is a Linksys SOHO router with the firewall 
feature turned on. All inbound traffic is dropped, unless it is part of 
an existing related connection.

So, if I connect to www.google.com, the router sees the incoming packets 
and lets them pass since the end-user requested them. However, if 
google.com tries to contact my PC for no reason, the Linksys router 
discards the connection attempt.


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