Cisco Explorer 4700 Installation Guide download pdf (Page 495)

12-75

Device Manager Guide, Cisco ACE 4700 Series Application Control Engine Appliance

OL-26645-02

Chapter 12 Configuring Traffic Policies

Configuring Rules and Actions for Policy Maps

Header The name and value in an HTTP header are used for application inspection decisions.

1. In the Header field, select one of the predefined HTTP headers to be matched, or select HTTP

Header to specify a different HTTP header.

2. If you select HTTP Header, in the Header Name field, enter the name of the HTTP header to

match. Valid entries are unquoted text strings with no spaces and a maximum of 64

alphanumeric characters.

3. In the Header Value field, enter the header value expression string to compare against the

value in the specified field in the HTTP header. Valid entries are text strings with a maximum

of 255 alphanumeric characters. The ACE appliance supports regular expressions for

matching. To include spaces in the string, enclose the entire string in quotes. All headers in

the header map must be matched. See Table 12-33 for a list of the supported characters that

you can use in regular expressions.

Header Length The length of the header in the HTTP message is used for application inspection decisions.

1. In the Header Length Type field, specify whether HTTP header request or response messages

are to be used for application inspection decisions:

–

Request—Indicates that HTTP header request messages are to be checked for header

length.

–

Response—Indicates that HTTP header response messages are to be checked for header

length.

2. In the Header Length Operator field, select the operand to be used to compare header length:

–

Equal To—Indicates that the header length must equal the number in the Header Length

Value (Bytes) field.

–

Greater Than—Indicates that the header length must be greater than the number in the

Header Length Value (Bytes) field.

–

Less Than—Indicates that the header length must be less than the number in the Header

Length Value (Bytes) field.

–

Range—Indicates that the header length must be within the range specified in the Header

Length Lower Value (Bytes) field and the Header Length Higher Value (Bytes) field.

3. Enter values to apply for header length comparison:

–

If you select Equal To, Greater Than, or Less Than in the Header Length Operator field,

the Header Length Value (Bytes) field appears. In the Header Length Value (Bytes) field,

enter the number of bytes for comparison. Valid entries are integers from 0 to 255.

–

If you select Range in the Header Length Operator field, the Header Length Lower Value

(Bytes) and the Header Length Higher Value (Bytes) fields appear:

1. In the Header Length Lower Value (Bytes) field, enter the lowest number of bytes to

be used for this match condition. Valid entries are integers from 0 to 255. The number in

this field must be less than the number entered in the Header Length Higher Value (Bytes)

field.

2. In the Header Length Higher Value (Bytes) field, enter the highest number of bytes to

be used for this match condition. Valid entries are integers from 1 to 255. The number in

this field must be greater than the number entered in the Header Length Lower Value

(Bytes) field.

Table 12-30 HTTP Deep Packet Inspection Match Types (continued)

Match Condition Type Description

1 ... 494 495 496 ... 648

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