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。

无极=无聊^2 + 无耻 + 无知

http://news.sohu.com/20060511/n243184458.shtml

《无极》让圆明园的叶子黄了近两年

本报记者夏心蕾报道 继建设部副部长仇保兴在一份主题报告中披露“电影《无极》剧组在云南香格里拉碧沽天池拍摄,对当地自然景观造成破坏”后,记者昨日获悉,《无极》在圆明园取景拍摄期间,为了制造效果,对园内西部的部分植被涂过一种黄色涂料。据介绍,这种涂料对植被破坏相当严重,被涂过涂料的植物在近两年后都没恢复绿色,仍有大量残留黄色。

解释一下,无聊^2就是无聊的平方了,这个自然不必多说。

无耻:拍戏了不起?排戏可以践踏一方水土?还乱扔饭盒……真是强将手下无弱兵了,看样子每个剧组成员都为破坏环境做出了自己的努力。

无知:造个效果=刷漆?难怪赚不到钱,钱都给油漆匠了。
无极中不是所有场景都是真的,对吧?那个圆环套圆环(我习惯称之为电炉子)就不是。为啥非要对树木下毒手玩真的!?
俗话说,活到老学到老。二陈虽然老了点,该学习还是要学习的:人家matrix里整个世界都是泛绿的,怎么没见matrix剧组买绿漆刷new york?多用用大脑,多用用电脑,省下些钱也好报名个学习班什么的。

最后,请保护环境!不要因为拍片子破坏环境,更不要因为拍烂片子破坏环境!!

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.