Configuration Guide Configuring TCP
in continuous SYN flooding. When a device actively makes a request for a connection with an external
device, through telnet for example, shortening SYN timeout reduces user's wait time. You may prolong SYN
timeout properly on a poor network.
 Configuring TCP Window Size
size: Indicates a TCP window size. It ranges from 128 to (65535 << 14) bytes. The default is 65535 bytes.
Global configuration mode
 Configuring the Sending of TCP Reset Packets After Receiving Port Unreachable Messages
Global configuration mode
By default, TCP reset packet sending upon receiving port unreachable messages is enabled.
 Configuring MSS
ip tcp mss max-segment-size
max-segment-size: Indicates the maximum segment size. It ranges from 68 to 10000 bytes. By default, the
MSS is calculated based on MTU.
Global configuration mode
This command defines the MSS for a TCP communication to be established. The negotiated MSS for a new
connection should be smaller than this MSS. If you want to reduce the MSS, run this command. Otherwise,
do not perform the configuration.
 Configuring MSS Value for TCPv4 SYN Packets
ip tcp adjust-mss max-segment-size
max-segment-size: Indicates the maximum segment size, ranging from 500 to 1460 bytes
Interface configuration mode
 Configuring MSS Value for TCPv6 SYN Packet
ipv6 tcp adjust-mss max-segment-size
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