Figure 73 Basic Filtering Router

This design has a number of drawbacks:

• Public servers are on the internal side of the router, which means a compromised public server is able to attack internal systems without further filtering by the router.

• A single filtering router is a single point of access control failure.

• The lack of stateful filtering requires large ranges of ports to be open for most applications to function.

On the positive side, this filtering option is very easy to implement and in no way impacts the surrounding network.

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