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Security/Hacking CompTIA Security Certification Study Guide, Third Edition
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Security/Hacking Network and System Security
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Security/Hacking Introduction to Network Security (Repost)
Security/Hacking Security Study Guide {Repost}
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Security/Hacking The Hacker's Underground Handbook Learn What it Takes to Crack Even the Most Secure Systems
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Security/Hacking 移动IP技术指南
Posted on 2010-04-27
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想象一下，你正要休个长假或要出差一年，由于要离开家很长一段时间，所以必须作出些安排，以确保你的邮件能随时送到你手中，而你可能每两个星期就会换个地址。在这种情况下，又如何保证邮件能送到你那里呢？
一种方法是寄明信片给每一位可能给你写信的人，包括公用事业公司、信用卡公司、朋友和亲戚，通知他们地址变更情况，还要特别小心，千万不能告诉那些可能寄送垃圾邮件的人。这种方法存在许多问题。首先，每次换地方就要寄一遍明信片。其次，必须给每一位能想到的、可能给你写信的人寄上明信片，否则等回家时，就可能发现有人在几个月前给你家寄了一份非常紧急的通知。第三，在这种方式中，没有任何办法来防止恶作剧者以你的名义发出这种明信片，从而使得你的信件被送到他们手中，或是送到你的商业对手的手中，或是任何你所不希望的地方。 更好的方法是在你家所在的邮局留下一个转发通知，这样，所有寄来的信件都将被转发到你当前的新地址。这种方法的好处在于，将新地址只告诉邮局，而无需通知每一位可能给你写信的人。邮局可以提供一些安全措施，保证用户的真实身份，确保不是别人假冒你，并且还可以通过认证，确保你确实有改动转发地址的权限。 诚然，如果一些邮件按你先前的地址进行了转发，可当它们在半路上时，你却又换了新 地址，那么，这些邮件就可能会暂时丢失。解决这个问题的方法是：在你离开之前，通知邮局将信件再转发到你的新地址上。当然，也可以通知给你写信的人，如果在一定的时间内没有收到回信，就请再给你重发一次。 这里，如果将“信件”改为“因特网数据包”，将“转发”改为“隧道技术”，将“邮局”改为“具有移动I P功能的路由器”，那么前面所讨论的情况就和移动I P一样了。下面我们将用整本书来进一步作详尽的描述。
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