Cisco ASA Firewall Fundamentals, 3rd Edition by Harris Andrea

By Harris Andrea

Cisco ASA Firewall basics – third variation: step by step functional Configuration consultant utilizing the CLI for ASA v8.x and v9.x This booklet has been to be had simply in e-book structure for a number of years and has been embraced via hundreds of thousands of Cisco ASA pros, from rookies to specialists. This new version, “Cisco ASA Firewall basics – third variation” is now provided to you in paperback layout besides. the hot third variation has been improved and up to date to hide the newest Cisco ASA model 9.x (and past models 8.x as well). All configurations, instructions and examples within the booklet are appropriate for all ASA 5500 and 5500-X units and should paintings on ASA model 9.x. This ebook is loaded with uncooked useful options, step by step configuration tutorials, and greater than 50 community diagrams to give an explanation for the eventualities. it is also whole configuration examples and real-world instances that you're going to now not locate anyplace else. there is not any fluff or redundant details. subject matters lined during this e-book comprise the center ASA firewall gains in addition to the main frequently-encountered eventualities that you'll locate in genuine international networks. The publication is written by means of 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 advanced concept. the various themes coated comprise the next: Getting began with Cisco ASA Firewalls (User Interface, entry Modes, software program updates, password restoration etc). easy Firewall Configuration (Basic Configuration Steps). Configuring community tackle Translation (NAT) for pre-8.3 and post-8.3 types. Configuring DMZ Networks. Configuring and utilizing entry keep watch over Lists (ACLs). Configuring VLANs and Subinterfaces. Configuration of risk Detection (Basic, complicated, and Scanning probability Detection). IKEv1 and IKEv2 IPSEc VPNs (site-to-site VPN, distant entry VPN etc). Anyconnect safe Mobility patron (SSL VPN, IKEv2 VPN, certificates Authentication etc). Configuring Active/Standby Stateful Failover. complex positive factors of equipment 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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Sample text

If no source_port is specified, the firewall matches all ports.  dest_address mask: This is the destination IP address/network that the source address requires access to. You can use also the “host” or “any” keywords.  [operator dest_port]: Specify the destination port number that the source traffic requires access to. The “operator” keyword can be “lt” (less than), “gt” (greater than), “eq” (equal), “Neq” (Not equal to), “range” (range of ports). If no dest-port is specified, the firewall matches all ports.

10 any eq 25 ciscoasa(config)# access-list SMTP extended deny tcp any any eq 25 ciscoasa(config)# access-list SMTP extended permit ip any any ! Apply the rules above globally no matter from which interface the traffic comes from. Useful when we have many interfaces on the ASA. x there were some changes in Access Control Lists regarding IPv4 and IPv6 traffic. Now, on the same ACL you can have both IPv4 and IPv6 addresses (as source and destination addresses on the ACL). x. x and later, it represents “ALL IPv4 AND IPv6 addresses”.

Example: ! 4 Controlling Inbound and Outbound Traffic with ACLs A picture is a thousand words. Refer to the picture diagram below for the example scenarios that will follow. These examples will show you how to control Inbound and Outbound Traffic flow: 52 Enjoy Scenario 1: Allow Inbound Access to DMZ Servers For the Web and email Servers above, we have created static NAT mappings in order to translate their real private addresses into public addresses that are accessible from the Internet. In addition to the static NAT statements, we have to use also ACLs to allow the appropriate Inbound traffic towards our servers.

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