3Com Switch 4200G Configuration Guide

42
IP PERFORMANCE CONFIGURATION
IP Performance
Configuration
Introduction to TCP
Attributes
You can configure the following TCP attributes of the Ethernet switch:
■ synwait timer: When a SYN packet is sent, TCP starts the synwait timer. If no
response packet is received before the synwait timer times out, the TCP
connection is terminated. The timeout time of this timer ranges from 2 seconds to
600 seconds and defaults to 75 seconds.
■ finwait timer: When the TCP connection status changes from FIN_WAIT_1 to
FIN_WAIT_2, the finwait timer is started. If no FIN packet is received before the
finwait timer times out, the TCP connection is terminated. The timeout time of this
timer ranges from 76 seconds to 3,600 seconds and defaults to 675 seconds.
■ The sizes of receiving and sending buffers of connection-oriented sockets, which
range from 1 KB to 32 KB and default to 8 KB.
Configuring TCP
Attributes
Displaying and
Debugging IP
Performance
After the above IP performance configuration, you can execute the display
commands in any view to display the system operating status and thus verify the IP
performance configuration.
Table 320 Configure TCP attributes
Operation Command Description
Enter system view system-view —
Set the timeout time of the TCP
synwait timer
tcp timer syn-timeout
time-value
Optional
By default, the timeout time of
the TCP synwait timer is 75
seconds.
Set the timeout time of the TCP
finwait timer
tcp timer fin-timeout
time-value
Optional
By default, the timeout time of
the TCP finwait timer is 675
seconds.
Set the transceive buffer size of
the TCP socket
tcp window window-size Optional
By default, the transceive buffer
size is 8 KB.