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The first step is to decide whether to configure CBAC on an "internal" or "external" interface An internal interface is an interface on the router where client sessions originate This side is often called the "trusted" or "clean" side of the router This interface will be on the router closest to the devices you are attempting to protect An external interface is an interface on the router where client sessions exit the router This side is often called the "untrusted" or "dirty" side of the router This interface will be the one closest to the devices you are attempting to filter If there are more than two interfaces, the extra interfaces are normally used as a demilitarized zone (DMZ) A DMZ is a segment that provides services to both the internal and external interfaces For example, a Web server used by both internal and external clients would be placed on the DMZ The purpose of the DMZ is to provide services to external clients while still limiting inbound traffic to the internal network This way, if a host on the DMZ is compromised, hosts on the internal network are still protected If a device on the internal side of the router were
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compromised, there would be no way the router could prevent further compromise of internal hosts A good source for more discussion on the design of secure perimeters is Building Internet Firewalls by Chapman and Zwicky If there is only an internal and external interface, it is most common to configure CBAC on the external interface This way, any traffic attempting to enter the network will be inspected by CBAC If there are one or more DMZ segments, CBAC can be configured on either the interface closest to the originating hosts or on the interface closest to the destination hosts We will show an example where CBAC is configured closest to the originating hosts Traffic might be initiated from external and internal clients to hosts on the DMZ Any traffic attempting to enter the internal network, however, would be blocked CBAC is intelligent enough to create openings in an access list on an interface other than the interface where inspection is defined As we will see, if CBAC is configured to inspect traffic arriving at an inside interface, CBAC can create openings in an inbound access list on the outside interface of the router for the return traffic If CBAC is configured in two directions, CBAC should be configured for one direction first and then configured independently for the second direction When configuring CBAC in complex situations, you should configure CBAC on the interface where the traffic originates CBAC will take care of creating the necessary openings for the return traffic We will see an example of this complex situation later Because the configuration of CBAC on a router with a DMZ interface is more complex than on a router with only two interfaces, we will provide an example of the former We will use the network diagram in Figure 8 3 as a reference Notice that FTP, DNS, and SMTP services are available on the server in the DMZ We will return Figure 8 3 later in this section
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Figure 8 3: A sample network configuration
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side of the router Inbound refers to traffic that is originating from an untrusted side of the router to a trusted side of the router The outbound access list specifies traffic that you wish to be inspected by CBAC This access list might be either a standard or extended IP access list The inbound access list is the access list where temporary openings will actually be created and managed by CBAC This access list must be an extended IP access list NoteIn this context, an access list filtering inbound traffic could be applied either inbound (on the untrusted interface of the router) or outbound (on the trusted interface of the router) In the example in this section, we will configure multiple inbound and outbound access lists to accommodate CBAC in two directions
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