7.5 Configuring TCP Attributes
You can configure TCP attributes to improve network performance.
7.5.1 Establishing the Configuration Task
Before configuring TCP attributes, familiarize yourself with the applicable environment,
complete the pre-configuration tasks, and obtain the data required for the configuration. This
will help you complete the configuration task quickly and accurately.
Applicable Environment
On certain networks, you need to adjust TCP parameters to improve network performance.
Pre-configuration Tasks
Before configuring TCP attributes, complete the following tasks:
l Connecting interfaces and setting physical parameters for the interfaces to ensure that the
physical layer status of the interfaces is Up
l Setting link layer protocol parameters for interfaces to ensure that the link layer protocol
status on the interfaces is Up
l Setting network layer protocol parameters for interfaces to ensure that the routing protocol
status on the interfaces is Up
Data Preparation
To configure TCP attributes, you need the following data.
No.
Data
1 Values of the SYN-Wait timer and FIN-Wait timer, and packet receive or transmit
buffer size of a connection-oriented socket
7.5.2 Setting Values of TCP Timers
You can set values of the SYN-Wait timer and FIN-Wait timer to control TCP connections.
Context
TCP uses the following timers:
l SYN-Wait timer: When SYN packets are sent, the SYN-Wait timer is started. If no response
packet is received after the SYN-Wait timer expires, the TCP connection is closed. The
value of the SYN-Wait timer ranges from 2 to 600, in seconds. The default value is 75s.
l FIN-Wait timer: When the TCP connection status changes from FIN_WAIT_1 to
FIN_WAIT_2, the FIN-Wait timer is started. If no response packet is received after the
Huawei AR150&200 Series Enterprise Routers
Configuration Guide - IP Service 7 IP Performance Configuration
Issue 02 (2012-03-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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