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Chapter 2

TCP Implementation Notes

This chapter contains speciﬁc implementation notes to keep in mind when you

conﬁgure Bay Networks TCP services.

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. Window Size

parameter in the Edit TCP Global Parameters window (see Chapter 3). 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).

The value you set for Max. Window Size depends on how much memory you need

for services other than TCP. If you have a complicated conﬁguration, specify a

low Max. Window Size value for TCP connections since space is limited. Systems

with less involved conﬁgurations can support more TCP connections and a higher

Max. Window Size value.

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Avaya Configuring TCP Services Manual de usuario Pagina 25