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A risk assessment may uncover the need for a firewall in a network, but the risk level or return on investment may not justify the cost of a stand-alone firewall Cisco has developed the Cisco Firewall IOS feature set as a cost-effective solution to a stand-alone firewall, for those companies requiring more security than Cisco's IOS can provide Cisco Firewall IOS is a Cisco IOS software image that can be deployed on supported Cisco routers Security capabilities are enhanced when the Cisco Firewall IOS feature set is installed The following router series support the Cisco Firewall IOS: 800 Series UBR900 Series 1600 Series 1720 Series 2500 Series 2600 Series 3600 Series 7100 Series
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7200 Series As discussed just above, integrated security on Cisco's network devices is not a new concept Existing Cisco IOS supports the following security technologies, as defined in the earlier section "Cisco Router IOS Security Technologies": Perimeter security Identification and authentication Denial of Service (DoS) protection Data integrity and confidentiality Reporting
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Cisco has enhanced some of the security features of its IOS and included additional protection in order to offer Cisco Firewall IOS These added features are defined in the following sections
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Access control lists (ACLs) can be applied to routers to permit or deny certain traffic ContextBased Access Control (CBAC) is an extension of the ACL concept ACLs provide filtering on the following: IP destination address IP source address IP protocol field TCP source port TCP destination port They do not, however, keep track of these facts: How long ago the last packet in the session was transmitted Whether the sequence/acknowledgment numbers are climbing as expected Whether the session was initiated from the inside or outside Whether the session is still open or has been closed What port or ports are being used by the return data channels CBAC is a new packet-filtering mechanism introduced in the Cisco Firewall IOS feature set; it provides "stateful" packet filtering CBAC bases decisions on the state of TCP sessions Unlike ACLs, which only monitor the network and transport layers, CBAC also examines protocol information at the application layer in order to obtain the state of the session This state information is collected and used to create temporary add-on filters The result is an added layer of protection than what is provided by traditional access lists The CBAC process goes like this: Data is inspected as it comes in to or leaves the router If the data passes inspection, it is forwarded and CBAC creates a state table Return traffic is only permitted if the state table indicates the packet belongs to a valid session When the session ends, the state table is deleted The CBAC packet inspection includes recognition of application-specific commands Several applications are recognized by CBAC You have the opportunity to specifically permit or deny these CBAC-recognized applications Packet inspection also provides the detection and prevention of
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application-level attacks CBAC recognizes the following: World Wide Web (WWW) Telnet Simple Network Management Protocol (SNMP) Finger File Transfer Protocol (FTP) Trivial File Transfer Protocol (TFTP) Simple Mail Transfer Protocol (SMTP) Java blocking BSD R-cmds Oracle SQL*Net Remote Procedure Call (RPC) VDOnet's VDOLive RealNetwork's RealAudio Intel's Internet Video Phone Microsoft's NetMeeting Xing Technology's StreamWorks White Pine Software's CU-SeeMe CBAC is configured on a per-interface basis It can therefore be configured differently for each interface and deployed only on chosen interfaces
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Cisco Firewall IOS feature set controls the downloading of Java applets (Java is a programming language used to write Web applications and Java applets) Using Cisco Firewall IOS, HTTP connections can be configured to filter or completely deny access to Java applets that are not embedded in an archive or compressed file These Java applets within HTTP traffic are blocked based on Web server IP address All traffic from Web servers that contain Java applets can be explicitly permitted or denied via standard access lists Figure 14-10 illustrates Java blocking by the Cisco IOS Firewall feature set
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