tcp random sequence number

The CERT/CC has received a report from Guardent, Inc. concerning an observed statistical weakness in initial sequence number (ISN) generation for TCP connections.Guardent asserts in copyrighted research forwarded to us that incrementing the ISN by some series of pseudo-random amounts is insufficient to protect some TCP implementations from a practical ISN guessing attack in some real-world . The sequence number is not initialized with zero, it's initialized with a random number ISN for each side of the connection. I have some questions, Why the seq number set to random, there will be safer? A typical TCP handshake (simplified) begins with an initiator sending a TCP SYN packet with a 32-bit sequence (SEQi) number. Without randomness, all crypto operations would be predictable and hence insecure. TCP sessions are established by a three-way handshake and use random 32-bit sequence and acknowledgement numbers to ensure the validity of traffic. The recognition number is the next byte sequence that the recipient expects to receive. The feature hides the sequence numbers generated by the endpoints behind the higher security interface by shifting them by a certain value (determined in a random fashion for each TCP connection). A sequence number is a number that TCP associates with the starting byte of data in a particular packet. Window Scale Factor The IE test involves sending two ICMP echo request packets to the target. Station A sends another request containing 50 bytes. Understanding random number generators, and their limitations, in Linux Finally in 1996, . TCP sequence prediction attack - Wikipedia 5432) which marks the beginning of the sequence numbers for data that the Host A will transmit. Sequence number (SEQ): 32-bit value to track what was transmitted; I don't know of any special formula or requirement used to determine the starting sequence number; it's a random number; Acknowledgement number (ACK): 32-bit value to track to indicate what was received How to solve TCP sequence number approximation vulnerability issue

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