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神秘博士已经被宣布续订第十季！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.陈胜的失败是必然的，当年秦灭六国，楚国是没有罪过的，自从楚怀王被骗入秦国没有回来，楚国人至今还在同情他。有使者前来，总督请这边的统帅共进晚餐。之前赵思萍看杨长帆的钱袋鼓囊得夸张，只当是一堆铜钱，怎么也想不到，竟然全是银子。Backup websites are not necessarily full-featured. If they can browse statically, they can meet the needs. At the very least, it should be possible to display a notice to tell users that there is something wrong with the website and that all efforts are being made to repair it. When my personal website went offline, I made a temporary homepage with a few simple lines of HTML code.User2 = new User2 (this);