2013年8月23日 星期五

[Windows] List all devices on the network in command prompt

arp -a


Notes:

What is ARP?

Address Resolution Protocol - which stores the mapping of IP address to physical MAC address.

E.g.




What is dynamic type and static type?

Static type - you hard-coded the rule somewhere.

Dynamic type - the OS automatically find the rules for you when start-up.


Where does the table store?

ARP table stores in RAM in windows. So it clears and updates again after reboot.


Where does the static type rule store in windows?

Use netsh command in windows (remember to run as administrator) to figure it out yourself. ;)


How to clear the static ARP entry?

Run netsh interface ipv4 reset  (remember to run as administrator).

:) Happy networking :D


2013年8月22日 星期四

[Ubuntu] Some Basic Commands

sudo poweroff

sudo reboot

sudo shutdown -h 0


[Ubuntu GUI] shortcut

Ctrl + Alt + L = Lock Screen
Ctrl + Alt + T = Terminal

[Ubuntu] Accidentally "apt-get removed" a package

*Note: Related packages can be removed also.



1) Check what has(have) been removed from log:

sudo vim /var/log/apt/history.log



2) Download back the .deb file(s) with exactly the same package version, Ubuntu version and CPU model from web in another internet-connected computer. Upload them to the ill server('s desktop).




3) Install the .deb file(s) in LIFO seq. accd. to log using:

sudo dpkg -i the_deb_file_with_same_version_number_and_cpu_model.deb



4) Restart Ubuntu.



Check if it works or not.




[Ubuntu] Check Ubuntu version

lsb_release -a

[Blogger] Change time zone setting



https://support.google.com/blogger/answer/41963?hl=en

[Ubuntu] List all VirtualBox VMs

VBoxManage list vms


Help:
VBoxManage list [--long|-l] vms|runningvms|ostypes|hostdvds|hostfloppies|
                            bridgedifs|hostonlyifs|dhcpservers|hostinfo|
                            hostcpuids|hddbackends|hdds|dvds|floppies|
                            usbhost|usbfilters|systemproperties|extpacks



Variant Example:

VBoxManage list runningvms --long

2013年8月19日 星期一

[Windows Sticky Notes] How do I change the default font-size of Windows 7 desktop app Sticky Notes?

Ctrl + shift + >

Ctrl + shift + <

http://superuser.com/questions/35589/how-do-i-change-the-default-font-of-sticky-notes

Elementary Networking

Test for connectivity:

[Windows]

Using IP:
ping 192.168.1.123

Using port:
telnet 192.168.1.123 321


Check localhost config:
ipconfig

For more details:
ipconfig \all

* note: slash below "Enter" key




[Linux]

Using IP:
ping 192.168.1.123

Using port:
telnet 192.168.1.123 321

check localhost config:
ifconfig

For specific details:
ifconfig eth0

2013年8月3日 星期六

Weight Loss! The journey continues

是一個漫長的奮鬥旅程…… 最近嘗試努力改變的生活習慣: 晚上九時半去瞓覺 瞓覺前唔用電子奶咀,即喺ipad同手提電話(因為呢家部電話用耐咗,會無電要叉過夜) 用蔬果代替日常零食,例子有:車厘茄、藍莓、士多啤梨、粟米芯、提子,都係細細地嘅一舊一舊comp食啲 唔食熱氣零食 安靜去每...