Cisco Systems Configuring Filtering Rules

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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter42 Configuring Filtering Services
Filtering URLs and FTP Requests with an External Server
Step5 Click OK to close this dialog box.
Filtering HTTP URLs
This section describes how to configure HTTP filtering with an external filtering server and includes the
following topics:
•Enabling Filtering of Long HTTP URLs, page42-6
Enabling Filtering of Long HTTP URLs
By default, the ASA considers an HTTP URL to be a long URL if it is greater than 1159 characters. You
can increase the maximum length allowed.
To configure the maximum size of a single URL, perform the following steps:
Step1 In the URL Filtering Servers pane, click Advanced to display the Advanced URL Filtering dialog box.
Step2 In the Long URL Support area, check the Use Long URL check box to enable long URLs for filtering
servers.
Step3 Enter the maximum URL length allowed, up to a maximum of 4 KB.
Step4 Enter the memory allocated for long URLs in KB.
Step5 Click OK to close this dialog box.
Configuring Filtering Rules
Before you can add an HTTP, HTTPS, or FTP filter rule, you must enable a URL filtering server. To
enable a URL filtering server, choose Configuration> Firewall > URL Filtering Servers.
To configure filtering rules, perform the following steps:
Step1 From the ASDM main window, choose Configuration > Firewall > Filter Rules.
Step2 In the toolbar, click Add to display the types of filter rules that are available to add from the following
list:
•Add Filter ActiveX Rule
•Add Filter Java Rule
•Add Filter HTTP Rule
•Add Filter HTTPS Rule
•Add Filter FTP Rule
Step3 If you chose Add Filter ActiveX Rule, specify the following settings:
•Click one of the following radio buttons: Filter ActiveX or Do not filter ActiveX.
•Enter the source of the traffic to which the filtering action applies. To enter the source, choose from
the following options:
– Enter any to indicate any source address.