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From: Jim on 23 Jan 2008 14:54
Here is a good write up on FW, its history of development and various types
that evolved.
http://en.wikipedia.org/wiki/Firewall#Function

"Jim" <invalid(a)example.invalid> wrote in message
news:hTrlj.474595$kj1.343833(a)bgtnsc04-news.ops.worldnet.att.net...
> A FW can block all access inbound and outbound. There are two(2) types of
FW
> in general; Hardware and Software FW. If you have a cable or dsl
connection
> with a modern modem, you probably all ready have a HW FW that utilizes
> Network Address Translation adequately without a router. You will have to
> research that yourself by manufacture or consult your ISP help online. The
> Software FW blocks all ports(software) from inbound attacks and
unsolicited
> port scans. The windows xp/vista FW will only block inbound. Many Software
> FW like ZoneAlarm (the easiest free FW available to learn with) also
blocks
> outbound with permissions that you can assign, but in the case of ZA, a
> server will also assign permissions at initial start up of an application
> that wants access to the Internet. There are many free FW for trial out
> there and a good website would be www.freefirewall.org . I hope this helps
> you on your way.
>
> <geniusguest0711(a)gmail.com> wrote in message
> news:c5716e7e-cb5d-4fb1-8ce6-3386951d78f9(a)m34g2000hsb.googlegroups.com...
> > i want to know what firewall can and cannot block..
> > please give me a detail information about it..
>
>


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