Re: Linksys router as Firewall

From: Leythos (void_at_nowhere.com)
Date: 07/18/03 

Date: Fri, 18 Jul 2003 14:52:25 GMT

In article <9ocfhvo8u70j2p31123lgd9mafatlvvjfs@4ax.com>,
noemail@noemail.net says...
> On Thu, 17 Jul 2003 15:38:44 GMT, Michael Ferguson
> <mcf@augustmail.com> wrote:
>
> > If you have some evidence which suggests otherwise, please
> >post it. Or, even better, find me a sub-$200 box that does proxy-ARP.
> >That's a standard feature on all real firewalls, and I've been
> >searching for some time to find it on a consumer-grade "NAT
> >forwarder." :)
>
> There are many different levels of firewalls. Firewalling is a
> concept, not a set if directives or any particular methodology. You
> can get NAT, SPI, routing tables, and port forwarding on consumer
> firewalls. What else does a home user need?
>
> If you want to pay for more so you can feel better about the term
> firewall, be my guest.
>

firewall:
1. A computer that (
a) acts as an interface between two networks (e.g., the Internet and an
private network, respectively), and
(b) regulates traffic between those networks for the purpose of
protecting the internal network from electronic attacks originating from
the external network. The firewall is capable of handling the following
tasks: (a) isolating internal and external traffic (a bridge service);
(b) making internal addresses invisible and directly unaccessible from
outside and passing through authorized traffic after proper checking (a
proxy service);
(c) facilitating protected (encrypted) connections to cooperative
parties over public networks (a tunneling service);
(d) filtering outgoing traffic for security and network usage rules
(filtering or monitoring service);
(e) filtering incoming traffic for rogue data (viruses, spam,
inappropriate data (filtering), or improper actions (port scanning,
overload prevention, etc.;
(f) blocking forbidden external services or addresses (blocking,
"network nanny"-functions);
(g) providing log-in services for authorized outside users and
simulating the approved outside user as an inside user (proxy, log-in
server);
(h) caching network traffic (cache service);
(i) converting between different network protocols on different protocol
levels (bridge when handling lower level protocols, gateway when
handling higher level protocols);
(j) traffic diverting (e.g., for cost optimizing, accounting, network
planning, monitoring);
(k)providing consistent, open entry to the internal network (portal
service) and facilitating public network address and connection sharing
(proxy service).

2. [A] system designed to defend against unauthorized access to or from
a private network. Firewalls can be implemented in both hardware and
software, or a combination of both. [INFOSEC-99] Synonyms front-end
security filter, proxy.

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