TCP MSS (Maximum Segment Size): the maximum size of the data segment of a TCP packet can be transmitted at a time. For some data meeting certain qualifications, NGAF supports changing the TCP MSS values of such data packets. This function is used to adapt the device to a more complicated network environment. It is advised to enable it when necessary.

Check Enable to enable TCP MSS configuration, and click Add to add a rule.

Name: Set the rule name.

Description: Set the description of the rule.

MSS: Set the TCP MSS value that needs to be specified.

Source: Set the source IP group and source port, and specifies the source conditions matching this rule.

Destination: Set the destination IP group and destination port, and specify the destination conditions matching this rule.