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However, in the world of iptables, The most commonly used matching condition is not "dignified", But the "source address", "destination address", "source port", "destination port" and so on of the message, In the world of iptables, The most commonly used actions are ACCEPT (Accept), DROP (Discard) and REJECT (Reject), of which ACCEPT is similar to the "Release" in our example. However, the matching conditions and actions we mentioned just now are not all, but the most commonly used ones. The specific matching conditions and actions are not the focus of our discussion today, and we will make a summary in future articles.In the growing period of users, there can be measures to increase the frequency of activity, such as from once every 3 days to every day; Users in recession need to be recalled, such as telling him that he has red envelopes waiting for him to receive, or that I still have some gold coins left over and can exchange them for gifts.The first scheme is to use the general coding method to realize the preloading technology of the picture. First, create the imgNode element, Then when the method myImage.setSrc is called, a preloaded picture is given to the picture first, and when the picture is loaded, the img element is assigned a value. The second scheme is implemented by using proxy mode. MyImage function is only responsible for creating img elements, proxy function ProxyImage is responsible for setting loading pictures for the picture, and when the picture is really loaded, myImage.setSrc method in myImage is called to set the path of the picture. The advantages and disadvantages between them are as follows:Another main technology to prevent SYN attacks is to adjust TCP/IP protocol stack and modify TCP protocol implementation. The main methods include SynAttackProtect protection mechanism, SYN cookies technology, increasing the maximum half connection and shortening the timeout time. The adjustment of TCP/IP protocol stack may cause some functions to be limited, and administrators should do this work on the premise of full understanding and testing.Connect the iPhone to the computer when the phone is turned on. (Please use the original data cable or the official normal data cable)赵锋听是这样，才放下心来，笑道：也是。