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In fact, the scene we described above is not perfect, Because the target address of the message accessed by the client may not be the local machine, but other servers. When the kernel of the local machine supports IP_FORWARD, we can forward the message to other servers. Therefore, at this time, we will mention other "levels" in iptables, that is, other "chains". They are "before routing", "forwarding" and "after routing". Their English names are只对你一人说过，我保证。Related Articles:战地迷情The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.　　杰克工作的第一天就在阿洛佐的带领和训导下展开了。他跟随阿洛佐深入这座光怪陆离的大都市最阴暗无序的角落，与那些威胁着社会安全与秩序的异端分子正面交锋。毒贩、暴徒、窃贼、妓女、黑帮人物……各色人等令他们应接不暇……在普林斯顿大学附属医院内，坐镇一位大名鼎鼎的内科医师——格雷戈·豪斯（休·劳瑞 Hugh Laurie 饰），他穿着邋遢随便，手拄拐杖，刚愎自用，锋芒毕露，全然没有人们印象中那类谦和严谨的专业医师的影子。可是在这副令人咋舌的外表之下，却藏着令同行和病患佩服得五体投地的高超医术和丰富学识。豪斯医生治病的手法也独树一帜，他不当面问诊，也绝对不相信病患的道白感受，而完全凭借自己卓越的学识和高超的推理能力解决了诸多疑难杂症。