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This easy setup dramatically saves technical support costs. By allowing all traffic by default, Linksys ensures that the router/firewall is easy to set up, with little to no configuration required to allow access to external resources. The vast majority of home users do not know what a port is, much less what they should or should not be filtering. The reason for this "backward" implementation speaks to the heart of the debate over security and functionality. The router allows all traffic from internal sources, blocking only the traffic that is explicitly defined. Filtering Traffic from Internal Sourcesįiltering of traffic from internal sources breaks with the minimalist approach and applies a terribly flawed filtering philosophy to the router. For all intents and purposes, you might as well not even have a firewall. The host still resides behind NAT, but the router will allow all traffic from external sources to access the host in a completely unfiltered and unrestricted manner. DMZ ForwardingÄMZ forwarding is the most insecure of all filtering methods from external sources because it applies absolutely no filtering. With port triggering, you can configure the router to open ports 7777 through 7779 only after an internal host has attempted to connect to something on the external network using port 27900. Using port forwarding, you would need to potentially permit all of those ports, all the time, to allow a host to run the application. For example, Unreal Tournament uses UDP ports 7777 through 7779 to communicate between hosts, but uses port 27900 to communicate with the central game server. A common example of this is many gaming applications. Port triggering is used primarily to support applications that attempt to communicate with hosts using different ports than what they were contacted on. When that occurs, the port triggering mechanism automatically allows traffic to be forwarded to the host that initiated the trigger condition. Port triggering does not forward any traffic to an internal host until that internal host has initiated some form of traffic for an external destination. Port triggering forwards traffic to internal hosts in a similar manner to how port-range forwarding works, with one important difference.
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Linksys provides three methods of explicitly permitting traffic: This policy ensures that only the traffic you explicitly permit is allowed to access protected resources. By default, all traffic that originates from an external host is blocked by the router/firewall unless it is specifically permitted. Linksys adheres to the minimalist approach to filtering when it comes to filtering traffic from external sources. Depending on the direction of the traffic flow, a different filtering methodology is applied. Most Linksys routers/firewalls rely on simple NAT routing and basic port filtering to control the flow of traffic through the router.
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