How to do URL filtering

url filtering

1 Create a class-map (class map) to identify transmission traffic.

The first network segment of the intranet

Second definition of regular expression, determine the (domain name) keyword contained in the URL

Third check the IP message header , whether it is http traffic

2 Create policy-map (policy map), associate class-map

either allow this link

or discard this link

Usually the policy is applied to the inside (inbound) interface

Only one policy mapping can be applied to an interface

3 Apply class-map to the interface.

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//Define ACL access control list aclfile//

access-list aclfile extended permit tcp 192.168.100.0 255.255.255.0 any eq www

Establish class mapping aclclass

class -map aclclass

match access-list aclfile //Match access control list//

//Define regular expressions to specify websites that need to be filtered and are not allowed to be accessed//

regex url "\.accp\.com" //*Be careful not to write the slash backwards*//

Create a class mapping urlclass

class-map type regex match-any urlclass

match regex url // call matching regular expression //

httpclass // Create a category mapping for checking traffic //

## Class-Map Type Inspect httpclass

#match request header host regex class urlclass //Call the previously configured urlclass1//

----------------------- -------------------------------------------------- ----------------

policy-map type inspect http httppolicy //Create policy mapping //

class httpclass                                                                                                                         using   use   using   use                 ’ use ’s ’ s ’ s               ‐ ‐ ‐‐ ‐‐ ‐ ​ ​ ​ ​ ​ //Create policy mapping //

class httpclass ​ ​ ​ ​ ​ ​ ​ ​ //Call the inspection that has been done Class mapping of http header //

drop-connection log                                                                     use using using using ‐                     ‐ ‐                                 ’ ’ ’ ’ ’ ‐ ‐ ‐ ‐ ‐ ‐ o ###### Class ACLCLASS // Call the class mapping of the access control list // ###### stect http httppolicy // Check the defined strategic mapping // ##### Service-Policy Insidepolicy Interface INSS IDE //Apply on port//###

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