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

辦公室心態秘技輯錄

要過感恩的生活,在工作中也要如是。 有同事脾氣暴躁,所以跟他相處不刺激到他已值得感恩了,可是當他發脾氣的時候,告訴自已不要放於心裏,不要被他的說話影響自己就好了。 有同事不負責任,這個很難相處,就做好自己本份,辛苦委屈唯有交托給主。 有同事懶懶閒,這也改變不到他的心態,不與他說話...