Configuring Tcp Attributes; Configuring The Tcp Send/Receive Buffer Size; Configuring Tcp Timers - HP 830 Series Configuration Manual

After the configurations, if you ping the subnet broadcast address (2.2.2.255) of VLAN-interface
2 of Switch A on the host, the ping packets can be received by VLAN-interface 2 of Switch B.
However, if you disable the ip forward-broadcast command, the ping packets cannot be received
by the VLAN-interface 2 of Switch B.

Configuring TCP attributes

This section provides information about configuring TCP attributes.

Configuring the TCP send/receive buffer size

Step
1. Enter system view.
2. Configure the size of TCP
receive/send buffer.

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 system cannot create a TCP connection.
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 is 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 when it gets the last non-FIN packet.
The connection is broken after the timer expires.
The actual finwait timer is determined by the following formula:
Actual finwait timer = (Configured finwait timer – 75) + configured synwait timer
To configure TCP timers:
Step
1. Enter system view.
2. Configure TCP timers.
Command
system-view
tcp window window-size
Command
system-view
•
TCP synwait timer:
tcp timer syn-timeout time-value
•
TCP finwait timer:
tcp timer fin-timeout time-value
86
Remarks
N/A
Optional.
8 KB by default.
Remarks
N/A
Optional.
By default:
•
The TCP synwait timer is 75
seconds.
•
The TCP finwait timer is 675
seconds.