Cisco ASA 5540 - Page 722

34-6
Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
Chapter 34 Configuring Filtering Services
Filtering URLs and FTP Requests with an External Server
Step 5 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, page 34-6
Enabling Filtering of Long HTTP URLs
By default, the adaptive security appliance 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:
Step 1 In the URL Filtering Servers pane, click Advanced to display the Advanced URL Filtering dialog box.
Step 2 In the Long URL Support area, check the Use Long URL check box to enable long URLs for filtering
servers.
Step 3 Enter the maximum URL length allowed, up to a maximum of 4 KB.
Step 4 Enter the memory allocated for long URLs in KB.
Step 5 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:
Step 1 From the ASDM main window, choose Configuration > Firewall > Filter Rules.
Step 2 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
Step 3 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.