3Com Router 3031, Command Reference Manual

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458 C
HAPTER
5: N
ETWORK
P
ROTOCOL
View
Interface view
Parameter
■
Value: The threshold for the TCP packet to be fragmented, with the value
ranging from 128 to 2048.
Description
Using the tcp mss command, you can designate a value as a threshold for TCP
packets to be fragmented. The undo tcp mss command is used to prevent TCP
packets from being fragmented. As the default MTU of the interface being 1500
bytes, this restricts the total length of encryption packet head + data link
expen IP packet head + TCP packet to 1500 bytes. So the dear length of
TCP packets to fragment may be about 1200 bytes.
By default, TCP packets are not fragmented.
Example
Configure the threshold of TCP packet fragmentation to be 300.
3Com-Ethernet0/0/0] tcp mss 300
tcp timer fin-timeout
Syntax
tcp timer fin-timeout time-value
undo tcp timer fin-timeout
View
System view
Parameter
■
time-value: TCP finwait timer value, in second, with the value range of 76 to
3600.
Description
Using the tcp timer fin-timeout command, you can configure the TCP finwait
timer. Using the undo tcp timer fin-timeout command, you can restore the default
value of the timer.
By default, TCP finwait timer value is 675 seconds.
When the TCP connection status changes from FIN_WATI_1 to FIN_WAIT_2, the
finwait timer is enabled. If FIN packet is not received before the timeout of finwait
timer, the TCP connection will be closed.
The configuration of this parameter needs to be implemented under the guidance
of the technical support engineers.
For the related commands, see tcp timer syn-timeout and tcp window.
Example
Configure the TCP finwait timer value as 675 seconds.
[3Com] tcp timer fin-timeout 675