Archive for May, 2011

Configuring Content Filters


Content filtering is triggered by the HTTP inspection engine, which must be enabled before any content CCIE service provider can be contacted. If you are about to configure content filtering, make sure you have the fixup protocol http (FWSM 2.x or PIX 6.x) or inspect http (PIX 7.x) command in the running configuration.
Likewise, if this [...]

Controlling Traffic


A host on one firewall interface is allowed to create any type of connection to a host on a different firewall interface as long as an address translation can be made (if required) and any relevant CCIE voice interface access lists permit it.
After address translation methods have been configured between pairs of firewall interfaces, you [...]

CCIE Routing and Switching Lab


When a CCIE firewall enters transparent mode, it no longer supports or has a need for address translation. After all, that is a function based on having different IP subnets on different firewall interfaces. In transparent mode, both interfaces must share the same IP subnet. However, IP packets are still inspected without the Layer 2 [...]

AAA Cut-Through Proxy Configuration Examples


In a sample network, user authentication is used on a Cisco CCIE firewall to require users on the inside to authenticate before initiating outbound connections. Users located on the 192.168.128.0/27 subnet should have all traffic except outbound DNS requests subject to authentication. The DNS traffic should be allowed without authentication so that users can resolve [...]

CISCO CCIE Exam


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Authenticating and Authorizing Generic Users


Generic user authentication is performed using only passwords. Users are authorized to perform certain actions based on the privilege level that they are permitted to use. Passwords can be defined for the two default privilege levels 0 and 15, as well as other arbitrary levels, using the following configuration steps:
1.  Set the unprivileged mode password:
FWSM [...]

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Selecting a Startup Configuration File


In PIX 7.0 and later, having multiple startup configurations makes configuration rollback easy. The startup configuration contents can be saved in one file during the time that the firewall configuration is stable. If major configuration changes need to be made, the new updated running configuration can be saved to a new startup configuration file. The [...]

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Switching Basics and Intermediate Routing CCIE [...]