A stupid switch configuration trick

Today we discovered that we'd accidentally done a stupid switch trick tocheat ourselves out of some link bandwidth: we'd accidentally configuredsome untagged ports on one of our top-level switches to also carry sometagged VLANs.

(Normally you configure switch ports in one of two ways: either theycarry one untagged VLAN and nothing else, or they carry some taggedVLANs and no untagged traffic.)

This is effectively invisible, because the regular traffic is stillflowing, and nothing complains about the extra stuff.


20070503 網摘 – 檸檬茶中毒症

Queen

Copyright


洗版

香港 Blog 界 被檸檬茶淹沒 ,澳門示威發展成警民衝突,今天連身在海外的 digg 也被「洗版」。

簡單來說,就是有人找到了 HD- DVD 的十六位 Processing Key,貼了上 digg。digg 採取相關行動,刪文刪戶口,結果引來網民反彈。幾乎首頁上的每一條新聞


My view of Ubuntu

We use Ubuntu here , but by now I can'tsay that we're exactly fond of it. At this point we're using it notbecause we like it but because we lack a better alternative, whichgives me a somewhat jaundiced perspective.

A disclaimer: this is about Ubuntu 6.06 (Dapper Drake, the LTS releasethat will be supported for a long time). Moving to more recent Ubuntureleases is not an option for us, because we need longer support periodsthan 1


攝石檸檬茶

見大家 在玩 ,我又玩!先來個警告:這是完全是下三流類科幻創作。


檸檬茶,好久沒喝囉!我都忘了是何味道了!

當年在香港的茶餐廳裏,炎炎夏日裏來杯凍檸茶,是很多人的至愛。當你在點菜時,一時未想到要喝甚麼,叫杯檸


Some good practices for web servers

Here's something important for file ownership on web servers:

The user that the web server runs as should not own anything that the webserver serves.

This means that the web server's user shouldn't own anything under thedocument root or in CGI areas, and there shouldn't be any writeabledirectories under either that it can use to put things in. Stronglyresist the temptation to have CGIs write data files under the CGI areaor in the docroot, even if they are normally blocked from being


Being specific about where your systems are

For a long time, whenever we installed systems we didn't bother to beterribly specific about where they were located, which generally comesup when you get asked about time zones. For example, a lot of thingsdefault to 'America/New York', and since that's in the Eastern timezone a lot of the time we said 'sure, whatever' and went on.

The recent American DST rule change illustrates that this is nowhazardous; it is now important to actually be specific about


20070430 推介網誌

英文由F學起

https://hk.myblog.yahoo.com/siu82english/

在香港,英文是一重要的語文。而要學一種語文,讀寫聽講少不了。可是香港的英文課程,一般都不會太重視發音,也不教音標,甚至連老師也發音不準。此 blog 有一系列「擺脫


集體記憶的迷宮:談喬靖夫《誤宮大廈》

書名: 《誤宮大廈》
作者: 喬靖夫
出版:鐵道館2007年4月


故事開始時,作者佈下最典型的偵探小說格局,一位律師代表城中富商委託偵探谷智明調查一宗特別的案件。當然,在正式聘用之前,谷明智的專長和技能都被律師

What matters about object oriented operating systems

Many years ago, I went to a talk about a new object oriented operatingsystem (a research project, obviously). The presenter made a big dealabout how everything in, eg, their filesystem was an object, and sothings were very general and you could put anything in the directoryobjects, and as they went on I noticed something disturbing: while youcould put all those different things into directories, none of themseemed to have the same set of methods; in fact, the methods wereoften significantly