CCNP Security Firewall 642-617 Quick Ref. by A. Mason

By A. Mason

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Figure 41 HTTP Protocol Adherence To configure the next inspection, select Inspections tab to start adding the manual inspections to the HTTP policy map. Select Add and start to configure the inspection. The first inspection to add is to allow only the GET request method HTTP protocol to the server. In the Match Criteria section, select the Single Match option to specify a single condition. In the Match Criteria section, specify No Match as the Match Type. This drops all traffic except traffic matching the specific criteria.

Different source ports are used on the external address to differentiate between the internal addresses, and this information is held by the device performing the translation so that it can work out where to send the return packets. PAT is also commonly referred to as NATOverload. On the ASA, NAT is required when traffic is flowing from a lower-security interface to a higher-security interface. For example, the outside interface has a security level of 0, and the inside interface has a security level of 100.

You can now see the new rule that has been configured on the outside interface and has been placed above the implicit rule that denies all other traffic. Traffic can now access the website from anywhere on the Internet. © 2011 Cisco Systems Inc. All rights reserved. This publication is protected by copyright. Please see page 110 for more details. [ 47 ] Section 3: ASA Access Control Figure 29 Access Rules Screen Using Object Groups Within ACLs You now want to extend this further and permit HTTPS into the web server.

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