Configuring The Tcp Buffer Size; Configuring Tcp Timers; Enabling Sending Icmp Error Messages - HP 6125XLG Layer 3-Ip Services Configuration Manual

To enable TCP SYN Cookie:
Step
1. Enter system view.
2. Enable SYN Cookie.

Configuring the TCP 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:
SYN wait timer—TCP starts the SYN wait timer after sending a SYN packet. If no response packet
•
is received within the SYN wait timer interval, TCP fails to establish the connection.
FIN wait timer—TCP starts the FIN wait timer when the state changes to FIN_WAIT_2. If no FIN
•
packet is received within the timer interval, TCP terminates the connection. If a FIN packet is
received, TCP changes connection state to TIME_WAIT. If a non-FIN packet is received, TCP restarts
the timer, and tears down the connection when the timer expires.
To configure TCP timers:
Step
1. Enter system view.
2. Configure TCP
timers.

Enabling sending ICMP error messages

Perform this task to enable sending ICMP error messages, including redirect, time-exceeded, and
destination unreachable messages.
ICMP redirect messages
•
A host that has only one default route sends all packets to the default gateway. The default
gateway sends an ICMP redirect message to inform the host of a correct next hop by following
these rules:
The receiving and sending interfaces are the same.
Command
system-view
tcp syn-cookie enable
Command
system-view
tcp window window-size
Command
system-view
•
Configure the TCP SYN wait timer:
tcp timer syn-timeout time-value
•
Configure the TCP FIN wait timer:
tcp timer fin-timeout time-value
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Remarks
N/A
The default setting is disabled.
Remarks
N/A
The default buffer size is 64 KB.
Remarks
N/A
By default:
•
The TCP SYN wait timer is 75
seconds.
•
The TCP FIN wait timer is 675
seconds.