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結論 tcp_syncookies = 0 の場合 tcp_max_syn_backlog の 75% を超える half openなコネクション要求が来た場合、dropされる(TCP: drop open request from [IP]/[PORT]) somaxconn と tcp_max_syn_backlogの小さいほうの値を、付近の2の累乗の値に切り上げた数値を超えると、drop (TCP: Possible SYN flooding on port [PORT]. Dropping request.) tcp_syncookies = 1 の場合 somaxconn と tcp_max_syn_backlogの小さいほうの値を、付近の2の累乗の値に切り上げた数値を超えると、cookie送信 (TCP: Possible SYN flooding on port [PORT]
OpenSSL supports a number of different SSL ciphersuites, which can have a huge impact on the overhead that SSL imposes on HTTP traffic. Below I approach SSL from the performance side of things. Sites deploy HTTPS for one of two reasons: Financial or highly sensitive data is involved, there are regulations mandating security policies, and it would be extremely advantageous to someone if they obtain
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