By Harris Andrea
Cisco ASA Firewall basics – third version: step by step functional Configuration consultant utilizing the CLI for ASA v8.x and v9.x This publication has been on hand in simple terms in e-book layout for a number of years and has been embraced through millions of Cisco ASA pros, from newbies to specialists. This new version, “Cisco ASA Firewall basics – third variation” is now provided to you in paperback structure to boot. the hot third variation has been improved and up-to-date to hide the most recent Cisco ASA model 9.x (and prior types 8.x as well). All configurations, instructions and examples within the booklet are appropriate for all ASA 5500 and 5500-X units and may paintings on ASA model 9.x. This ebook is loaded with uncooked sensible ideas, step by step configuration tutorials, and greater than 50 community diagrams to give an explanation for the eventualities. additionally it is entire configuration examples and real-world circumstances that you're going to now not locate at any place else. there is not any fluff or redundant info. themes lined during this e-book contain the middle ASA firewall positive aspects in addition to the main frequently-encountered situations that you'll locate in genuine global networks. The publication is written through community protection specialist Harris Andrea, a Cisco qualified specialist with greater than 18 years of ASA adventure, and specializes in simplicity and practicality rather than complicated thought. a number of the themes lined comprise the next: Getting began with Cisco ASA Firewalls (User Interface, entry Modes, software program updates, password restoration etc). simple Firewall Configuration (Basic Configuration Steps). Configuring community deal with Translation (NAT) for pre-8.3 and post-8.3 models. Configuring DMZ Networks. Configuring and utilizing entry keep an eye on Lists (ACLs). Configuring VLANs and Subinterfaces. Configuration of hazard Detection (Basic, complex, and Scanning hazard Detection). IKEv1 and IKEv2 IPSEc VPNs (site-to-site VPN, distant entry VPN etc). Anyconnect safe Mobility buyer (SSL VPN, IKEv2 VPN, certificates Authentication etc). Configuring Active/Standby Stateful Failover. complex positive aspects of machine Configuration. Authentication Authorization and Accounting (AAA) Configuration. Configuration of identification Firewall. Configuring Routing Protocols on ASA (Static Routes, RIP, OSPFv2, OSPFv3, EIGRP). Modular coverage Framework Configuration (Class Maps, coverage Maps etc). Configuring caliber of provider (QoS)-Traffic Policing, Shaping, Voice precedence Queueing and so on. Cisco ASA 5505. PLUS even more
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Additional info for Cisco ASA Firewall Fundamentals, 3rd Edition
Sample text
Per-Session PAT: This PAT mechanism is enabled by default for all TCP traffic and for UDP DNS Traffic. Per-Session PAT improves greatly the scalability of PAT because at the end of 35 Enjoy each per-session PAT connection, the ASA sends a reset and immediately removes the translation, thus tearing down the connection and hence freeing up resources on the device. For "hit-and-run" traffic, such as HTTP or HTTPS, the per-session feature is very efficient. However, for real time traffic (such as VoIP, H323, SIP etc) Per-Session PAT is not good.
Multi-Session PAT: Multi-session PAT, on the other hand, uses the PAT timeout, by default 30 seconds, before tearing down the translation and hence the connection. MultiSession PAT is useful for VoIP, H323, SIP and Skinny traffic. Therefore whenever you have this kind of traffic in your network it’s recommended to deny Per-Session PAT in order to use Multi-Session PAT. 10) and we want to disable Per-Session PAT for this server. 10, so that it uses multi-session PAT. e from higher security level to lower security level).
ASA1(config)# time-range workhours ASA1(config-time-range)# periodic weekdays 09:00 to 17:00 ASA1(config-time-range)# exit 58 Enjoy Step2: Create an ACL which will use the time range above ASA1(config)# access-list INSIDE-IN extended deny tcp any any eq www time-range workhours ASA1(config)# access-list INSIDE-IN extended permit ip any any ASA1(config)# access-group INSIDE-IN in interface inside From the configuration above, if a user tries to access the web and the time-range is within the “workhours” period, then the first ACL entry will be enabled and therefore the user will be blocked.
Cisco ASA Firewall Fundamentals, 3rd Edition by Harris Andrea
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