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Configuration of Cisco Firewall IOS
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Many of the configurations for Cisco Firewall IOS are similar or the same as for the Cisco IOS feature set Following are the steps to set up Cisco Firewall IOS CBAC on a router In addition to these tasks, a security-sensitive router should also include the recommended configurations under the router section 1Configure Control-Based Access Control (CBAC) parameters CBAC parameters, more commonly known as inspection parameters, enable inspection for specific protocols and define session timeouts Here are the commands: Router(config)#ip Router(config)#ip Router(config)#ip Router(config)#ip inspect inspect inspect inspect name name name name firewallrules firewallrules firewallrules firewallrules tcp timeout 3600 udp timeout 15 ftp timeout 3600 http timeout 3600
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2Apply inspection parameters to the appropriate interface Inspections are typically applied to the internal interface, so CBAC can be applied to packets initiating outbound connections This means temporary access-list entries are created in response to initiated traffic from the internal network Temporary access lists are configured on both interfaces (even though inspection is configured only on one interface) Typically, inspection parameters are configured (step 1) for only one interface, unless you have substantial traffic being initiated from the external network Then inspection parameters could be created and applied to the external interface on the router for external initiated traffic to that interface To apply inspection parameters to an interface, use the following command: Router(config)#ip inspect firewallrules in 3Define access lists Access is controlled by access lists, not by what's listed in the inspection parameters The purpose of configuring inspection parameters is to set timeouts and define the protocols to which CBAC should pay attention Access lists still need to be defined, just as they are for routers
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PIX Firewall is a hardware/software firewall that provides a wide range of security features without affecting network performance During the writing of this book, the PIX Firewall was the leading product line in its segment of the firewall market The following sections describe the features and functions of the PIX Firewall some are common to other firewalls, and some are unique
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The PIX Firewall is an isolated design based on the interaction between hardware and software Some competing firewalls on the market today are based on UNIX, Windows NT, or other operating systems that weren't developed specifically for a firewall solution Knowing that a firewall is based on a familiar OS makes it easier for hackers to figure out a firewall's design and get to your data Certainly we are not saying firewalls built on UNIX or NT have holes, but rather that their familiarity breeds opportunity to determine or generate holes
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Most firewalls operate by intercepting all traffic and validating its authenticity prior to sending it on This process can generate excessive overhead and may possibly become a network bottleneck The PIX Firewall design focuses not only on security but also on delivering outstanding performance Other proxy-based firewalls run continuously at the application layer In contrast, the PIX Firewall has software features that allow it to use the application layer level of security without having to run constantly at the application level This reduces the firewall overhead and thus reduces possible network latencies
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By selecting appropriate options for licensing, NICs, and the Operating System that supports your requirements, you can design a PIX Firewall best suited for your network environment SOFTWARE LICENSING A portion of the PIX Firewall price is based on your software licensing choice Regardless of your licensing level, you enjoy the same level of PIX Firewall support The only difference is that the PIX Firewall software is tweaked to satisfy only your licensing agreement, which is based on the number of simultaneous connections going through the PIX Firewall There are three different levels: Entry Level (128 connections) Midrange (1,024 connections) Unrestricted (up to 256,000 connections) It's important not to equate every user with one connection that is, if your network has 128 users who will be traversing the PIX Firewall, it doesn't mean the Entry Level is the right choice for your system Certain traffic, such as Web and FTP traffic, uses multiple connections A good rule of thumb for choosing a licensing level is to identify the number of employees who will be going through the PIX Firewall and multiply that number by five The prices associated with each licensing level are outlined later in this chapter, in the section "Target Market and Cost of Ownership" SUPPORTED TOPOLOGIES The PIX Firewall supports multiple interfaces; you can set up an internal network, an external network, and multiple "demilitarized zones" (DMZs) DMZs, sometimes called extranets, are isolated networks separated by a firewall from the internal (protected) network and the external (unprotected) network Web servers, FTP servers, and other servers accessed regularly by external users are examples of machines that would reside on the DMZ You can thus permit access to these services without compromising your entire internal network Although not all networks require a DMZ, all deployments of the PIX Firewall will have at minimum an internal and external interface Depending on the topology of the network on which the PIX Firewall is deployed, several types of NICs are supported: Single-port 10/100BaseT Ethernet (up to four NICs per PIX Firewall chassis) 4 and 16 Mbps Token Ring (up to four NICs per PIX Firewall chassis) Four-port 10/100BaseT Ethernet (may be combined with one or more single-port 10/100 Ethernet NICs) FDDI (up to two NICs per PIX Firewall chassis) NoteAny Cisco PIX Firewall warranties are void if the NICs are not purchased from Cisco or its authorized resellers
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Virtual Private Networks (VPNs)
Like Cisco routers, the PIX Firewall offers an IPSec standard, virtual private network (VPN) solution With IPSec encryption (described earlier in this chapter) running on a Cisco PIX Firewall (version 50 or greater), VPNs can be established between Windows PCs with the VPN client
software, Cisco IOS routers, or other PIX Firewalls or encryption devices that are IPSec compliant The PIX Firewall IPSec standard supports the Data Encryption Standard (DES)
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