Avaya Configuring IP Utilities Uživatelský manuál stáhnout pdf (Strana 43)

Overview of IP Utilities

308631-14.00 Rev 00

2-5

TCP Memory Considerations

The Transmission Control Protocol requires a significant amount of memory to:

• Retain copies of outbound data in case they must be retransmitted.

• Retain copies of inbound data in case they are received out of order and must

be rearranged.

• Manage the TCP connections.

The amount of memory used per TCP connection is dynamic. Each connection

uses a small amount of overhead memory (less than 1 KB), even if the connection

is idle. As the size of the transmit-and-receive window increases, so does the

memory for connections. It expands as much as TCP allows.

You can control the window size by setting a value for the Max. For information

on the Window Size parameter in the Edit TCP Global Parameters window, see

Chapter 3, “Customizing TCP Services.” The maximum amount of memory TCP

can use for a connection is equal to the overhead memory plus twice the window

size (because the window can fill in both directions).

FINWAIT-2 (7) TCP waits for a connection termination request from the remote

TCP.

CLOSEWAIT (8) TCP waits for a connection termination request from the client.

CLOSING (10) TCP waits for a connection termination request acknowledgment

from the remote TCP.

LASTACK (9) TCP waits for acknowledgment of the connection termination

request previously sent to the remote TCP.

TIMEWAIT (11) TCP waits for enough time to pass to ensure that the remote TCP

received the acknowledgment of its connection termination

request.

CLOSED (1) No connection.

Table 2-2. TCP Connection States

(continued)

State Definition

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 227 228

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Avaya Configuring IP Utilities Uživatelský manuál Strana 43