±€231

It's ±€231 for my price.

www.ubuntu-tw.org reaches 1M hits per day, again.

Ubuntu@Taiwan 正體中文站 討論區+wiki 又重回每日點擊百萬數了。
伺服器不穩定了好一陣子,現在終於重回當年盛況,每日點擊數超過一百萬! XD
特此紀念。

KVM - build ubuntu guest, bridge network and iptables port forwarding

Once you install and setup KVM, configure kvm itself and system network bridge interface correctly on your Ubuntu server,
you can now starting to build a guest OS / disk image, run it, and use iptables to forward connections to those new VPSes.

Build guest:

HTTP_PROXY="Proxy_IP:Port" sudo ubuntu-vm-builder kvm hardy \
--dest 'DEST_DIR'\
--hostname 'GUEST_HOSTNAME'\
--ip 'GUEST_IP_YOU_WANT'\
--arch 'i386'\
--mem '256'\
--rootsize '4096'\
--swapsize '1024'\
--kernel-flavour 'virtual'\
--domain 'bluet.org'\
--mirror 'http://ftp.twaren.net/ubuntu'\

How to flush / clean DNS cache in Linux

Sometimes your system caches too much on DNS query / records.

DNS caching helps alot on reducing time and bandwidth when your application needs DNS informations,
but just like anything else in the world; it's not a good thing when it does too over.

Let's see how to flush DNS cache in your system.

In Ubuntu:

$ sudo /etc/init.d/dns-clean restart
For Others:
Flush nscd DNS cache:

$ sudo /etc/init.d/nscd restart
OR
$ sudo service nscd restart
OR
$ sudo service nscd reload
OR
$ sudo nscd -i hosts
Flush dnsmasq dns cache

$ sudo /etc/init.d/dnsmasq restart

HITcon 2009 WasGame 解題分享

這次很開心跟 Dark, H4K, TW1943 一起組隊玩 wargame.
當初預定拿 200 分的目標有達到, 雖然沒拿第一名不過重點是培養了團隊默契, 感覺真的很棒.
回想起四五年前和 devil2k 一起 team hacking 德國佬網站的日子, 到現在已經很久沒有這種感覺了.
謝謝你, 2963. 啊不是, 我是說, 謝謝你們, Zuso Security 的朋友們.

其實應該可以再拿 80 分的... 因為
guestbook 在最後十分鐘 admin 沒進來, 所以沒拿到 session.
有兩題 windows 題在時間結束後十分鐘內解出來

此次 windows 題都是 Dark 跟 H4K 解的, 我只能分享 Unix 跟 Misc.

此次大多用 Perl, Firefox + Firebug + LiveHttpHeaders, telnel, strings, VirtualBox + XP 等工具解題

Unix1: 看 source code 後, 把參數準備好餵進去就行了. 在 PATH_INFO 卡一陣, 後來 h4k 找到了.

Unix2: 用黑刀 dezend 在 winxp 解出 source code, 再讀一讀就出來了.

I need 64bit kernel on my 32bit Ubuntu system...

1. I got 4G ram installed on my IBM X61 Laptop, with Ubuntu 9.04 Jaunty Desktop for i386 installed.
2. I need to use my whole 4G of ram bcoz I always has about 400 tabs opened in my Firefox.

All 32bit system can allocat only 33.5G of memory.

X61 uses Intel chips and VGA chip, which is some kind of shit.
Want to improve the xorg's intel driver, you got to install the latest kernel and driver, with UXA mode enabled.
Then, you might get glxgear score about 700~800fps, nice.

Now here comes the problem.

sockstat for Linux

sockstat was only for freebsd, now it's on linux too. something like ‘lsof -i -n’ or ‘netstat -anpe‘.

You can get the 0.3-1ubuntu1 version at the "Builds": https://launchpad.net/ubuntu/+source/sockstat/0.3-1ubuntu1

I download it and install it on my jaunty i386 without any problem.
Intro by chihchun: http://people.debian.org.tw/~chihchun/2009/02/23/sockstat-for-linux/

I need Rest... 我需要放假休息...

暌違多年

原來我還有這樣的一個 blog 被遺忘了了 :-) 科科科

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