R3204P16-HP Load Balancing Module System Maintenance Configuration Guide-6PW101
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Configuring the TCP send/receive buffer size
Follow these steps to configure the TCP send/receive buffer size:
To do… Use the command…
Remarks
Enter system view system-view —
Configure the size of TCP
receive/send buffer
tcp window window-size
Optional
8 KB by default.
Configuring TCP timers
You can configure the following TCP timers:
• synwait timer: When sending a SYN packet, TCP starts the synwait timer. If no response packet is
received within the synwait timer interval, the TCP connection cannot be created.
• finwait timer: When a TCP connection is changed into FIN_WAIT_2 state, the finwait timer is
started. If no FIN packet is received within the timer interval, the TCP connection will be terminated.
If a FIN packet is received, the TCP connection state changes to TIME_WAIT. If a non-FIN packet is
received, the system restarts the timer upon receiving the last non-FIN packet. The connection is
broken after the timer expires.
Follow these steps to configure TCP timers:
To do… Use the command…
Remarks
Enter system view system-view —
Configure the TCP synwait timer tcp timer syn-timeout time-value
Optional
75 seconds by default.
Configure the TCP finwait timer tcp timer fin-timeout time-value
Optional
675 seconds by default.
CAUTION:
The actual length of the finwait timer is determined by the following formula:
A
ctual len
g
th of the finwait timer = (Configured length of the finwait timer – 75) + confi
g
ured len
g
th of the
synwait timer
Configuring ICMP to send error packets
Introduction
Sending error packets is a major function of ICMP. In case of network abnormalities, ICMP packets are
usually sent by the network or transport layer protocols to notify corresponding devices so as to facilitate
control and management.
Advantages of sending ICMP error packets
There are three kinds of ICMP error packets: redirect packets, timeout packets and destination
unreachable packets. Their sending conditions and functions are as follows.
1. Sending ICMP redirect packets