Matrix之万里长城永不倒

1,现代长城初接触:
2000年,我发现我曾经华丽的个人网站居然打不开了,更过分的是整个GeoCities也从我的面前消失了,后来终于知道了原来是我们慈祥的Gov建立了GreatFireWall(简称GFW)来保护我们网民免受不良内容的侵扰。当然,我当时刚刚保障了自己的温饱,除了接受保护也没啥别的想法,毕竟有很多更迫切的事情(例如暂住证什么的)要考虑。

2,长城:
长城作为祖先的宏伟遗产,也是世界奇迹之一,更是我一直想瞻仰的古迹。前些天我去了箭扣古长城遗址,一览风景之余难免感叹祖先之伟大、长城之神奇:就算是今天修建也不是件容易事吧?想想咱四环路那么小一圈还修了好多年呢……登上山顶后我看到山脊两面各有一个小村子,而村民可能是经常互访吧,一条小路横跨山脊和长城的一个豁口。我想,如果这段长城能旋转90度,从墙,变为桥,两个村子的人应该都不会反对吧。

3,wiki:
在我看来,wikipedia是人类所建成的另一个奇迹:“所有较早接触互联网的用户对Wiki百科都并不陌生--作为全球最大的开放式互联网百科信息系统,WiKi内所包含的信息全面而详细,对于学生(尤其是大学生)来说,是最有效、完整的学术库,对于已经工作的职业人来说,也不啻为扩展视野,了解更多专业知识的有效途径--最关键的是,你也可以为WiKi添砖加瓦,开辟新条目,补充已有内容,发布自己的见解。” ——引用自Firefox+Tor必备教程

4,冲突:
“Have you ever had a dream, Neo, that you were so sure was real. What if you were unable to wake from that dream. How would you know the difference between the dream world and the real world?”——Morpheus, Matrix
“You know, I know this steak doesn’t exist. I know that when I put it in my mouth, the Matrix is telling my brain that it is juicy and delicious. After nine years, you know what I realize? Ignorance is bliss.”——Cypher, Matrix
正如cypher所说,无知是极乐。不知道wikipedia的人,例如从前的我,认为每件事就正是他们所被告知的那样,无他;而知道wikipedia的人则只有两种选择:忘掉wiki继续去做梦,或者从梦中醒来。

5,红药丸还是蓝药丸?
红药丸就在上面那个链接里,蓝药丸就在关闭本页的按钮上。

搞定ADSL路由故障一例

关键字:MTU
Maximum Transmission Unit. The greatest amount of data or “packet” size that can be transferred in one physical frame on a network. This packet also contains the header and trailer information, which are like addresses for each packet that are required by the routers on the network.

UPnP
Universal Plug and Play is making home networking simple for users. UPnP offers network connectivity of PCs, intelligent appliances, and wireless devices. UPnP leverages TCP/IP and the Web to enable control and data transfer among networked devices in the home and around the home. UPnP technology can be supported on essentially any operating system and works with almost any type of physical networking media – wired or wireless.

最近,不知道网通那边做了什么修改,我家的ADSL出了问题,症状如下:

1,直接拨号模式,一切正常;
2,路由模式下无法登录msn,无法post,无法用sftp上传等等
3,wow居然照样玩
4,emule也没事,呵呵

由于主要应用(wow+ emule)没受影响,我解决问题的动力自然打折扣了。不过老婆喜欢上msn,所以还是要解决的。

首先,拨号模式一切正常,排除硬件、线路故障。另外,我的笔记本在公司一切正常,回家才出症状,因此排除电脑故障。

然后我关闭了路由器上的防火墙,症状依旧,排除防火墙因素。这样,基本上可以断定,是传输协议上出了问题。我看了一下路由器上的MTU值,1492,而且不建议修改^O^ 我上网搜了一下,发现很多相关信息(在此感谢Google,感谢Baidu,感谢Yahoo!):

http://ask.so1ba.com/A/7942/9988.html

http://zhangfl.blogchina.com/zhangfl/606141.html

于是我把路由器的MTU从1492改为1454,抱着试试看的心态重启路由器。然后呢,当然就Mission accomplished。

笔记:几个网络术语

1,DMZ

我的翻译:

(发音就是单独字母的读音)是demilitarized zone的缩写,指电脑或子网位于信任的内部网,例如公司局域网,和非信任的网络例如互联网。
典型例子是,DMZ包含供互联网访问的设备,例如网站、文件服务、邮件服务和域名解析服务等。
此来源是军方应用,意为2组敌军之间的缓冲地带。

原文参考:

(pronounced as separate letters) Short for demilitarized zone, a computer or small subnetwork that sits between a trusted internal network, such as a corporate private LAN, and an untrusted external network, such as the public Internet.
Typically, the DMZ contains devices accessible to Internet traffic, such as Web (HTTP ) servers, FTP servers, SMTP (e-mail) servers and DNS servers.

The term comes from military use, meaning a buffer area between two enemies.

2,NTP

这个简单:Network Time Protocol

参考链接:

http://ntp.isc.org/bin/view/Main/DocumentationIndex

3,WINS

似乎没什么用了吧,MS的小家碧玉。WINS=Windows Internet Name Service。一个解析NetBios到IP的服务。NetBios是啥来着?

4,Snort

译文:

Snort是一个开源的网络入侵阻止与检测系统。系统使用的是一种结合签名、协议以及异常监测等好处的规则驱使语言。到目前具有上千万的下载,Snort已经是世界范围内最广泛应用入侵检测和阻止技术,并且已成为实际的工业标准。

参考原文:

Snort® is an open source network intrusion prevention and detection system utilizing a rule-driven language, which combines the benefits of signature, protocol and anomaly based inspection methods. With millions of downloads to date, Snort is the most widely deployed intrusion detection and prevention technology worldwide and has become the de facto standard for the industry.

5,BOOTP

译文:

Bootstrap Protocol 的缩写,一个允许无盘工作站了解到自己的IP地址、BOOTP服务器的IP地址然后装载一个文件到内存以引导系统。此协议使无盘工作站的引导成为可能。此协议由RFC951定义。

参考原文:

Short for Bootstrap Protocol, an Internet protocol that enables a diskless workstation to discover its own IP address, the IP address of a BOOTP server on the network, and a file to be loaded into memory to boot the machine. This enables the workstation to boot without requiring a hard or floppy disk drive. The protocol is defined by RFC 951.