Cisco Explorer 4700 Installation Guide download pdf (Page 306)

8-8

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

OL-26645-01

Chapter 8 Configuring Parameter Maps

Configuring Connection Parameter Maps

Slow Start Algorithm When enabled, the slow start algorithm increases the TCP window size as ACK handshakes arrive

so that new segments are injected into the network at the rate at which acknowledgements are

returned by the host at the other end of the connection.

Check this check box to enable the slow start algorithm, and clear this check box to disable the slow

start algorithm. This option is disabled by default.

SYN Segments With

Data

Indicate how the ACE is to handle TCP SYN segments that contain data:

• Allow—The ACE is to permit SYN segments that contain data and mark them for processing.

• Drop—The ACE is to discard SYN segments that contain data.

Urgent Pointer Policy Urgent data, as indicated by a control bit in the TCP header, indicates that urgent data is to be

processed as soon as possible, even before normal data.

Indicate how the ACE is to handle urgent data as identified by the Urgent data control bit:

• Allow—The ACE is to permit the status of the Urgent control bit.

• Clear—The ACE is to set the Urgent control bit to 0 (zero) and thereby invalidate the Urgent

Pointer which provides segment information.

TCP Window Scale

Factor

The TCP window scaling extension expands the definition of the TCP window to 32 bits and uses a

scale factor to carry the 32-bit value in the 16-bit window of the TCP header. Increasing the window

size improves TCP performance in network paths with large bandwidth, long-delay characteristics.

Enter the window scale factor in this field. Valid entries are integers from 0 to 14 (the maximum scale

factor).

For more information on TCP window scaling, refer to RFC 1323.

Action For TCP

Options Range

Indicate how the ACE is to handle the TCP options:

• Selective ACK

• Timestamps

• Action For TCP Window Scale Factor

By selecting one of the options:

• N/A—This option is not set.

• Allow—The ACE is to allow any segment with the specified option set.

• Drop—The ACE is to discard any segment with the specified option set.

Lower TCP Options Appears if you select Allow or Drop for the Action For TCP Options Range.

Enter the lower limit of the TCP option range. Valid entries are 6, 7, or an integer from 9 to 255. See

Table 8-4 for information on TCP options.

Upper TCP Options Appears if you select Allow or Drop for the Action For TCP Options Range.

Enter the upper limit of the TCP option range. Valid entries are 6, 7, or an integer from 9 to 255. See

Table 8-4 for information on TCP options.

Selective ACK Indicate how the ACE is to handle the selective ACK option that is specified in SYN segments:

• Allow—The ACE is to allow any segment with the specified option set.

• Clear—The ACE is to clear the specified option from any segment that has it set and allow the

segment.

Table 8-3 Connection Parameter Map Attributes (continued)

Field Description

1 ... 305 306 307 ... 648

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