Chapter 4 Firewall

Value

Description

 

 

 

 

"[xyz]\"images"

The literal string [xyz]"images"

 

 

\x

If x is a, b, f, n, r, t, or v, then the ANSI-C interpretation of

 

\x; Otherwise, a literal X. This is used to escape operators

 

such as *.

 

 

\0

A NULL character

 

 

\123

The character with octal value 123

 

 

\x2a

The character with hexadecimal value 2a

 

 

(r)

Matches an r; where r is any regular expression. You can

 

use parentheses to override precedence

 

 

Rs

The regular expression r, followed by the regular

 

expression s

 

 

rs

Either an r or an s

 

 

#<n>#

Inserts an end node causing regular expression matching

 

to stop when reached. The value n is returned

 

 

URL Test

Use the URL Test dialog to determine if a URL is covered by one of Web Filter Service category filters.

Check the Category of a URL

STEP 1

STEP 2

STEP 3

From the LSM menu, select Firewall > Web Filtering. Then, select the URL Test tab.

On the URL Test page in the Test URL table, type the URL you want to check.

Click Test to display the result.

One of the following messages displays:

• A message showing the category for the URL, for example:

www.bbc.co.uk is in the News Productivity Category

Error. Unable to contact categorization server

This message refers to the server selected on the Web Filtering page. To resolve the error: —Verify the X family DNS configuration specified on the device

—Check general Internet connectivity.

—Verify that the DNS configuration settings (Network > Configuration > DNS) on the external (WAN) virtual interface.

Error. Device is not licensed to use the 3Com web-filter service.

Purchase or renew the subscription for the Web Filter Service.

96 X Family LSM User’s Guide V 2.5.1