Tag Archives: Windows

How to set a proper MTU in your modem?

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First of all,I think you should know what MTU is.According to Wikipedia,maximum transmission unit (MTU) of a layer of a communications protocol is the size (in bytes) of the largest protocol data unit that it can pass onwards. MTU parameters usually appear in association with a communications interface (NIC, serial port, etc.). The MTU may be fixed by standards (as is the case with Ethernet) or decided at connect time (as is usually the case with point-to-point serial links). A higher MTU brings greater efficiency because each packet carries more user data while protocol overheads, such as headers or underlying per-packet delays remain fixed, and higher efficiency means a slight improvement in bulk protocol throughput.

Normally our modem has set up the default figure of MTU(i.e. 1492 for PPPoE).However,sometimes the default setting may not work so well to you.Thus,we could manually do some simple MTU ping tests to see whether the MTU has been set correctly.All right,here we go.

1.Run ‘cmd’ in ‘Start’ menu If you’re Windows.You will see the similar stuff like the following picture.

cmd1

 

 

2.Type in ‘ping –f –l 1472 208.67.222.222’ and press ‘enter’.You can put in the IP address of your DNS server provided by your ISP instead of 208.67.222.222.

If you get a reply like the picture below,you have to adjust ‘1472’ to a bit smaller figure such as ‘1471’.

cmd2

Please do the adjustments repeatedly until you could get a normal reply and write down the figure you are using(Eg. 1464).

3.Add 28 to that figure,ie. 1464+28=1492 and this is the proper MTU size to your modem.

Now what you need to do is to find the setting of MTU in your modem control panel and put the right figure to cover the default one.

Well,only 3 steps could help you improve the network efficiency.Why not giving a try? :D

Took a lesson again

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Yesterday I read a lot of articles about IT and I found that Ubuntu is more and more popular nowadays.

Ubuntu Logo

Since my interest on it was coming,I got a try to install ‘dual system’ in my PC-Windows XP+Ubuntu 7.04.I had referred tons of articles of the common issues before I started to install it.

It gave me a shock first when I redivided drivers-some unallocated spaces can not be used to form a new partition.I tried my best to figure out the problem without creating issues,but the fact was the worse.I did wrongly procedures so that I deleted one of my existing driver.My god,my pictures and documents are stored there.That was a big loss to me.

But I did the half way so I have to continue my work.Luckily,the following procedures were likely to be smooth and with around 30 mins auto-installation,the whole setup had been completed.I just waited it restarting and wish to see the ‘welcome windows’,but that made me sad again.Some errors were occured which led to fail in restarting and even can’t choose OS.

Damn it.After this grief ,I have to face the facts.So today morning,I reinstall windows and those necessary components again.From the things,I know that backup is very important and Ubuntu is not so easy to use for me till now.On the other hand,it’s jeering on my lacking skills.Perhaps I need to take more time to learn more about it and then start my hands to do it.

Testing on Safari

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Since Safari lauched for Windows platform,it has been  around 1 month.At the beginning,it’s really a hot topic.But one problem on it bothered me and let me calm down that not testing it at that time is it can not support Chinese encoding.

Last week,they updated it and released a newer beta version of Safari.Some fans did a futher testing use of it at once.They’re all surprising on the changes-Chinese is not a problem.Ok,I decided to try it.I downloaded it from the official website.As a normal software,just after some clicks and it had been in my pc and ready to run.By the way,the current version is 3.0.2(522.13.1).

my friend’s blog visiting by safari

I just entered into one of my friend’s blog(aboved picture),which is edited the blog in Chinese.It is fairly fast to load the page and take the web format as normal.Quite ok.Well,I tried to write a comment and at that time,I was mentioned a point that I can’t use any Chinese input when I was using Safari.It’s quite upset to me.Keeping on looking for problems and next one was showing when I was writing this article,I found I can’t click some buttoms in edit mode.

I think that is telling me to give up using it,at least now…Maybe I still need to wait for any great upgrade on it.Waiting…