Author: Roy Eassa
Date: 13:02:04 05/16/02
Go up one level in this thread
On May 16, 2002 at 15:38:01, Roy Eassa wrote: >On May 16, 2002 at 15:24:43, Roy Eassa wrote: > >>On May 16, 2002 at 15:10:57, Jon Dart wrote: >> >>>On May 16, 2002 at 14:39:00, Roy Eassa wrote: >>> >>> >>>> >>>>Jon, may I ask a question about this topic? >>>> >>>>I have a Linksys cable router (BEFSR41) that connects my computers to the cable >>>>modem. I've heard that it's an "OK" firewall as is, but would be a very good >>>>firewall if you configure it a certain way. What would I need to do? >>> >>>This is getting pretty far OT .. routers can generally be configured to block >>>access to particular ports. Some routers can do more sophisticated firewall >>>functions, such as "stateful inspection": this allows you, for example, to let >>>in only Internet traffic that comes in response to a request you have initiated. >>>How you do this is vendor-dependent. My DSL router has a web-based admin GUI >>>that you can use to configure it. But if your ISP installed the router, they may >>>not want you reconfiguring it .. it is more possible support headaches for them >>>if you have problems. >>> >>>--Jon >> >> >> >>The Linksys router is my own, not the cable company's. They don't even like >>that I have it. It is, like yours, configurable via WWW. I don't recall seeing >>"stateful inspection" but I know you can block ports (etc.). I just don't know >>which ones to block. >> >>When I bought the thing (March of 2000) I thought I was forever safe because it >>separates the cable company from my computers (which are essentially on a >>separate LAN). Now I'm not so sure, but I guess I'm too thick-headed in this >>area to understand the nature of my vulnerability given the separate LAN. >> >>Any help is appreciated -- including more general explanation and/or links to >>web pages that explain. Thanks! > > > >Some choices in the router's Filter menu: > >SPI: Enable/Disable >Block WAN Request: Enable/Disable >Multicast Pass Through: Enable/Disable >IPSec Pass Through: Enable/Disable >PPTP Pass Through: Enable/Disable >Remote Management: Enable/Disable >Remote Upgrade: Enable/Disable >MTU: Enable Disable Size: Turns out SPI _does_ mean "Stateful Packet Inspection", about which the Linksys web site confusingly says: "This feature checks the state of a packet to verify that the destination IP address matches the source IP of the original request. To use the firewall click the Enable button; otherwise select Disable to use the NAT firewall." To use one type of firewall, enable; to use another type, disable???
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