Question: SYN Attack. How large must be server's memory be to withstand a SYN attack? To answer this, suppose the following: Suppose that the initial value

 SYN Attack. How large must be server's memory be to withstand a SYN attack? To answer this, suppose the following:

  • Suppose that the initial value of RTO is 3 sec., and RTO is multiplied by two if a packet loss occurs.
  • Suppose that a TCP server will only resend a SYN-ACK four times if an ACK does not arrive before RTO after the previous SYN-ACK was sent.
  • Suppose that the server reserves 100KB of memory when a SYN arrives, and frees the memory after the connection ends, the connection is reset, or the connection fails (e.g., if no response for the SYN-ACK arrives after four retries).
  • Finally, suppose that the server is connected via a 10-Mbps link and SYN packets are 40B.

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