Setting The Tcp Buffer Size; Setting Tcp Timers; Enabling Sending Icmp Error Messages - HPE FlexNetwork MSR Series Comware 7 Layer 3 - Ip Services Configuration Manuals

establishes a TCP connection and enters ESTABLISHED state only when it receives an ACK packet
from the client.
To enable TCP SYN Cookie:
Step
1. Enter system view.
2. Enable TCP SYN Cookie.

Setting the TCP buffer size

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

Setting TCP timers

You can set the following TCP timers:
•
SYN wait timer—TCP starts the SYN wait timer after sending a SYN packet. Within the SYN
wait timer if no response is received or the upper limit on TCP connection tries is reached, TCP
fails to establish the connection.
•
FIN wait timer—TCP starts the FIN wait timer when TCP changes the connection state 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 the 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 set TCP timers:
Step
1. Enter system view.
2. Set 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
•
Set the TCP SYN wait timer:
tcp timer syn-timeout time-value
•
Set the TCP FIN wait timer:
tcp timer fin-timeout time-value
212
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.