The settings in this section specify how long a connection can remain idle, that is to say with no data being sent through it, before it is automatically closed. Please note that each connection has two timeout values: one for each direction. A connection is closed if either of the two values reaches 0.

TCP SYN Idle Lifetime

Specifies in seconds how long a TCP connection, that is not yet fully established, is allowed to idle before being closed.

Default: 60

TCP Idle Lifetime

Specifies in seconds how long a fully established TCP connection may be idle before being closed. Connections become fully established once packets with their SYN flags off have travelled in both directions.

Default: 262144

TCP FIN Idle Lifetime

Specifies in seconds how long a TCP connection about to close may idle before finally being closed. Connections reach this state when a packet with its FIN flag on has passed in any direction.

Using this setting is also discussed in a Clavister Knowledge Base article at the following link:

https://kb.clavister.com/354856423

Default: 80

UDP Idle Lifetime

Specifies in seconds how long UDP connections may idle before being closed. This timeout value is usually low, as UDP has no way of signaling when the connection is about to close.

Default: 130

UDP Bidirectional Keep-alive

This allows both sides to keep a UDP connection alive. The default is for cOS Core to mark a connection as alive (not idle) every time data is sent from the side that opened the connection. Connections that do not receive any data from the opening side within the UDP lifetime will therefore be closed even if the other side continues to transmit data.

Default: Disabled

Ping Idle Lifetime

Specifies in seconds how long a Ping (ICMP ECHO) connection can remain idle before it is closed.

Default: 8

IGMP Idle Lifetime

Connection lifetime for IGMP in seconds.

Default: 12

Other Idle Lifetime

Specifies in seconds how long connections using an unknown protocol can remain idle before it is closed.

Default: 130