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The principle is that syn messages are first responded to syn_ack by DDOS protection system. With a specific sequence number (recorded as a cookie). The real client returns an ack and the Acknowledge number is cookie+1. The fake client will not respond. In this way, we can know that the clients corresponding to those IP are real and add the real client IP to the white list. The next access passes directly, while other forged syn messages are intercepted. The following is a schematic diagram of protection:?He explained in detail how to fix the configuration problem with his server. In short, the problem stems from the assumption that BIND (a system that implements DNS protocol) disables recursion by default; The solution requires "instructing BIND to accept only recursive requests from servers in its data center. "现在为了牵制项羽，不得已支持刘邦壮大，决定这样做的时候，就必须清楚一点——培养对手的风险。　　宰相府中池塘，有一个美丽任性的鲤鱼精小莲，她和母亲日夜修练，以期飞升仙界。不甘寂寞的小鲤鱼常化作相府小姐牡丹的模样，混入人间游玩，直到有一天，她身临其境，被书生张子游救下，自此，她的命运便和这个书生纠缠在一起了。ACTION_DOWN: Finger just touched the screen权力这东西，固然可以高高在上，可是需要有生命来享受才行。