In the context of TCP traffic, auto-optimization begins with the sending of TCP control packets that—in the process of handshaking—determine which tunnel to use as they open the connection.
|
3
|
The client receives the SYN/ACK packet. The connection is established. The client then sends an ACK packet, along with the data, known as a TCP flow.
|
Beginning at the top and progressing to the bottom, this diagram summarizes the sequence of activities during handshaking in in-line deployments.
 |
Beginning at the top and progressing to the bottom, this diagram summarizes the sequence of activities during handshaking in out-of-path deployments.
 |
Note 
The appliance tries to override asymmetric route policy settings. It emulates Auto-opt behavior by using the same tunnel for the returning SYN+ACK as it did for the original SYN packet.
Enabled by default (in the Optimization Policy, under TCP Accelerations Details, this feature needs to be disabled if the asymmetric route policy setting is necessary to correctly route packets. In such a case, other features like flow redirection might need to be employed to ensure TCP optimization of the flow.
The appliance tries to override asymmetric route policy settings. It emulates Auto-opt behavior by using the same tunnel for the returning SYN+ACK as it did for the original SYN packet.Enabled by default (in the Optimization Policy, under TCP Accelerations Details, this feature needs to be disabled if the asymmetric route policy setting is necessary to correctly route packets. In such a case, other features like flow redirection might need to be employed to ensure TCP optimization of the flow.
