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Matching conditions are divided into basic matching conditions and extended matching conditionsLarge traffic attacks saturate the bandwidth and infrastructure of the network through massive traffic and consume them completely, thus realizing the purpose of flooding the network. Once the traffic exceeds the capacity of the network or the ability of the network to connect to other parts of the Internet, the network will not be accessible, as shown in the above figure. Examples of heavy traffic attacks include ICMP, fragmentation, and UDP floods.葫芦和板栗从外边走进来，后边呼啦啦跟了一群娃儿。Now, let's imagine why these "checkpoints" are called "chains" in iptables. As we know, The purpose of a firewall is to match "rules" for passing messages, Then execute the corresponding Action, So, when the message passes through these checkpoints, You must match the rules on this level, However, there may be more than one rule on this level, But there are many rules, When we put these rules in a chain, A "chain" has been formed. Therefore, we imagine each "checkpoint" as shown in the following figure. In this way, it is more appropriate to call them "chain". Each message passing through this "checkpoint" must match all the rules on this "chain". If there are qualified rules, the corresponding actions of the rules will be executed.90年代经典怀旧动画：《济公传奇》系列动画片 济公原名李修元，天台城关小北门外石墙头人。少时受佛道文化熏陶，涉猎经史传统文化，善诗、词。父母亡后，先后于国清寺、灵隐寺、净慈寺拜师学佛，被赐法号“道济”，又被戏称“济颠”，圆寂后近几千年来人们均称为-济公 怀旧动画片《济公传奇》是由中央电视台动画部出品，全集共5集。Public class SourceSub2 implementations Sourceable {在这个不同寻常的夏天里，花彪和杨夕青涩的初恋、李渔和黄澄澄你躲我追的单恋、杨肖和美对杨夕哥哥杨朝的暗恋正在酝酿发酵……伴随着少年们懵懂的感情悄悄发芽，关于梦想，关于未来的选择也悄然而至。