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Thursday 2009 September 24

HOWTO: KVM - build ubuntu guest VM, 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.

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HOWTO: 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.

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Tuesday 2009 July 21

HITCON 2009 WarGame / CTF writeup 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

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Sunday 2009 July 12

FSCK Gandi's Blog Service Again.

There seems No Way to change my blog's theme/template....

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.
Kernel's PEM conflicts with UXA, and makes the UXA's advanced GPU memory handling unusable.
So I can only have two choice:
1. Use generic kernel and better graphic performance, but only 3G of ram. But my memory is always full.
2. Use server kernel, got whole 4G of ram, but the glxgear score is only about 220fps. Sucks!

With 64bit system, the kernel can natively support to 64G of ram, so I can use 64bit generic kernel with whole my 4G of ram and enjoy the 800fps glxgear score. That's Great!

BUT, How To Install a AMD64 (64bit) Kernel on my i386 (32bit) System?
I did some google search but still find nothing really helpful...

FSCK GANDI's Blog Service.

I spend about half of an hour of my time to write my blog post and submit.
No error, the input box became blank. It's usual when posting a post successfully.

But when I check my blog, nothing shows.

Back to the dashboard and click some link, I asks me to login again.
WTF?! Where's My Article?! Damned It!!!!

Wednesday 2009 July 8

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":

I download it and install it on my jaunty i386 without any problem.
Intro by chihchun:

I need Rest... 我需要放假休息...

I need Rest

Monday 2009 July 6


原來我還有這樣的一個 blog 被遺忘了了 :-) 科科科

Tuesday 2007 November 20


What I want is a English or Chinese Interface, why does Gandi force me to use French?

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