ADSL connected, is it open without loging-in?

[Leythos]

Not to get bogged down in a flamewar, no matter how gentle, a router isn't
really a router if it doesn't participate in RIP, is it. I call 'em
"routers" or, more appropriately, "gateway appliances".

"Firewall" is a fairly flexible term, but SPI is one type of firewall. I'm
pretty sure that Cisco is a fairly reliable source.

-----------------------
Stateful Inspection

Basic Definition:
The ability of a firewall to retain "state" information about
ongoing network sessions. When a packet goes out through a stateful firewall
(TCP/UDP/ICMP), it will only permit expected return traffic that would
normally be returned in response to that packet from the remote site. This
prevents a wide variety of attacks.


http://business.cisco.com/app/searc...ic_view=true&kbns=2&DefMode=&keyword=stateful

You seem to have take SPI out of context "through a stateful firewall"
that does not indicate that a device that uses SPI is a firewall, it say
"through a stateful FIREWALL".

And all of the home units - Linksys include - offer RIP1 and RIP2 if the
user wants to manually set it up.

No flames, this is all good.