…SYNs with Spoofed IP Addresses Standard TCP suffers from the SYN flood attack [ RFC4987 ] because SYN packets with spoofed source IP addresses can easily fill up a listener's small queue, causing a service port to be blocked completely. TFO goes one step further to allow server-s…

…lled -- packet transmissions. Another example is the TCP SYN cookie mechanism [ RFC4987 ], which is available on many platforms. TCP with SYN cookies does not require a server to maintain per-connection state until the connection is established. TCP also requires the end that clo…

…number, and a local secret (similar to what is done for the TCP sequence number RFC4987 ). It will thus be able to verify whether it is indeed the originator of the key echoed back in the subsequent MP_CAPABLE option. As for a stateful server, the tokens SHOULD be checked for uni…