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。

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