When packets stop arriving on the flows of a session, the 128T router will clear the session after a period of time. The amount of time depends on the type of traffic.
Session Type Timeout
The time the router will wait before removing the session is governed by the timeout value in the session-type matched by the traffic.
For example, the following configuration examples show the session-types for
SSH. Their timeouts are
5000 milliseconds and
1900000 milliseconds respectively:
For traffic which does not match any session type, the following default timeout values are used:
- TCP - 1900000 ms
- UDP - 180000 ms
- ICMP - 10000 ms
For a session using TCP, the 128T examines the state of the flows. When first TCP packets arrive, the flows for the session are given a timeout of 10s. Once the connection reaches an established state, the timeout for the flows are updated to the default or configured session-type timeout value.