Specifications

TCP/IP Network Characteristics
8-18
Setting the TCP Keepalive Timer
What the Timer Does
The TCP keepalive timer determines whether a TCP connection with a remote
host is active and should remain open.
After the access server and a remote host establish a TCP connection, the access
server waits a set amount of time and sends a keepalive probe to the remote host.
If the access server receives a valid response from the remote host, it waits again
and sends a new keepalive probe.
If the access server does not receive a response from the remote host, it continues
to send keepalive probes until it reaches a set maximum. If the remote host does
not respond after the access server sends the last keepalive probe, the access
server drops the connection.
Setting the Timer
Use the SET/DEFINE/CHANGE INTERNET [TCP] KEEPALIVE TIMER
command to set the amount of time (in minutes) the access server waits to send
the first keepalive probe after establishing a TCP connection with an idle remote
host. The range is from 1 to 1440 (one day) and the default is 120 (2 hours).
Timer Set Example
The following example shows how to set the TCP keepalive timer to wait one
minute before sending the first keepalive timer:
Local> CHANGE INTERNET TCP KEEPALIVE TIMER 1
Disabling the Timer
By default, the TCP keepalive timer is enabled. Use the SET/DEFINE/CHANGE
INTERNET [TCP] KEEPALIVE TIMER DISABLED command to disable it.