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Although Cisco IOS offers TCP Intercept to prevent SYN-flooding attacks, Cisco Firewall IOS takes it a step farther and provides the following attack detections: Compares the rate of requests for new connections, and the number of half-open connections, to a configurable threshold level If the threshold is exceeded, an alert message is issued and other configured actions can be performed Monitors TCP connections and packet sequence numbers If the sequence numbers are not within an expected range, the suspicious packets are dropped In addition, Cisco Firewall IOS provides the following attack prevention: Drops old, half-open TCP connections if a configurable, maximum threshold is exceeded Blocks all SYN packets from the host under attack, until expiration of the (configurable) automatic timeout period
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Cisco Firewall IOS can be configured to send syslog messages to a central management console upon detecting suspicious activity This feature includes capability to Generate automatic alerts when attack prevention is enabled Configure the types of alerts to be sent via the syslog management tool Send alerts for DoS attacks, SMTP command attacks, or denied Java applets
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This section describes the benefits of Cisco Firewall IOS NoteIt is important to determine your security requirements with care Make sure that the Cisco Firewall IOS satisfies these requirements If not, a dedicated firewall may be more appropriate
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Assuming you have a Cisco-based network and the supported platforms, Cisco Firewall IOS can be integrated into your system Since it is a router-based firewall, there are fewer boxes to be managed Existing knowledge of Cisco IOS can be leveraged, thus requiring a milder learning curve for a new platform
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Cisco Firewall IOS feature set is available for a wide range of Cisco's router series Any Cisco routers you currently have deployed will likely be capable of supporting Cisco Firewall IOS, so there's less chance you'll need to buy additional hardware
Low Cost
Cisco Firewall IOS is extremely affordable, especially when comparing it to the cost of stand-alone firewalls Again, assuming your network is based on Cisco technology, and you have compatible routers deployed and sufficient expertise on Cisco IOS, then the implementation, ownership, and management costs will be minimal in comparison
Target Market and Pricing
The Cisco IOS Firewall feature set was developed as a cost-effective alternative to a stand-alone firewall However, as a software-based solution on existing routers performing other functionality, it is limited by the platform capabilities Therefore, it will be best deployed in the following environments: Small- to medium-sized businesses requiring Internet connectivity
Branch offices of large corporations using Cisco routers to access the Internet and the main office resources Internal perimeters within an enterprise network, to protect from casual access of vital assets such as financial databases and sensitive engineering projects Enterprises that are upgrading existing router-based infrastructure to enhance security Internet service providers offering managed solutions Companies wanting to enable secure communications with business partners When deciding whether to implement the Cisco Firewall IOS or to invest in a dedicated stand-alone firewall solution, it's important to balance your company's business needs with its security requirements Determine exactly what areas of security you would like to apply, and then define the firewall's access requirements Table 14-2 defines several common requirements related to access and security Table 14-2: Business Needs vs Security Requirements
Business Needs
Security Requirements
Connectivity Performance Ease of use Manageability Availability
Authentication Authorization Accounting Assurance Confidentiality Data integrity
Cost of Implementation
After your security requirements are defined, you need to weigh these requirements against the money you are willing to spend The cost of implementing Cisco Firewall IOS varies according to the router series in place and the version of Cisco Firewall IOS you choose Prices range from $700 for the lower end of the Firewall IOS series to more than $5,000 at the higher end of the series Cisco Firewall IOS comes in these versions: IP/Firewall Feature Pack IP/IPX/AT/IBM Firewall Plus 56 Feature Pack IP/Firewall Plus 3DES Feature Pack IP/IPX/AT/IBM/Firewall Plus IPSec 56 Feature Pack IP/Firewall PLUS IPSec 56 Feature Pack IP/IPX/AT/DEC/Firewall Plus IP/IPX/AT/DEC/Firewall Plus Feature Pack Enterprise/Firewall Plus 56 Feature Pack Enterprise/Firewall Plus IPSec 56 Feature Pack
In order to determine the version most suitable for your environment, make sure you have considered the following: What protocols must be supported Whether Triple DES (3DES) must be supported Whether IPSec must be supported (in order to establish VPNs) What Cisco router series must support the Cisco Firewall IOS version you choose (not all series support all versions)
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