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syn-ack-ack-proxy (IDS Screen Next Gen Services)



Hierarchy Level

Release Information

Statement introduced in Junos OS Release 19.3R2 on MX Series routers (MX240, MX480 and MX960) running Next Gen Services with the MX-SPC3 services card.


Configure the maximum number of connections from an IP address that can be opened without being completed. Once this threshold has been reached, further connection requests are rejected. In the SYN-ACK-ACK attack, the session table can fill up, resulting in the device rejecting legitimate connection requests.


threshold numberMaximum number of uncompleted connections from any single IP address.

Range: 1 through 250,000

Default: 512

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.