The Photon operating system must use TCP syncookies.
A TCP SYN flood attack can cause a denial of service by filling a system's TCP connection table with connections in the SYN_RCVD state. Syncookies can be used to track a connection when a subsequent ACK is received, verifying the initiator is attempting a valid connection and is not a flood source. This feature is activated when a flood condition is detected and enables the system to continue servicing valid connection requests.
Satisfies: SRG-OS-000142-GPOS-00071, SRG-OS-000420-GPOS-00186