国产区亚洲一区在线观看

田遥又犯起倔脾气来，他毫不留情面地说道：长辈们都慈和贤惠，那是不用说的。我有约了。秦淼诧异：院子里不是有水井么，怎么下池塘去洗了？云影从上房走出来，皱眉问道：这婆子嚷嚷什么，堵在门口喊？红椒急忙上前，把周婆子的话告诉了她，肯定是瞧见葫芦哥哥和我们进来了，故意说给我们听的。In TCP implementation, when receiving the SYN request from the client, the server needs to reply the SYN + ACK packet to the client, and the client also needs to send the confirmation packet to the server. Usually, the initial serial number of the server is calculated by the server according to certain rules or adopts random numbers. However, in SYN cookies, the initial serial number of the server is obtained by hash operation and encryption of the client IP address, client port, server IP address, server port and other security values, which is called cookie. When the server suffers from SYN attack and makes the backlog queue full, the server does not reject the new SYN request, but replies the cookie (SYN serial number of the reply packet) to the client. If it receives the ACK packet from the client, the server subtracts 1 from the ACK serial number of the client to obtain the cookie comparison value, and performs a hash operation on the above elements to see if it is equal to the cookie. If equal, complete the three-way handshake directly (Note: At this time, you don't need to check whether this connection belongs to the backlog queue).