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

[康復路] 試完又試

見了醫生,因為血色素又變低了,醫生想檢查是否「缺鐵」為成因,檢查又檢查…… 感覺有些麻煩……又抽血,又要留樣本…… 令我回想起當日入院的時光,因為一些原因,留樣本只需留一次,免卻留三次的麻煩;現在每天都要留一次,連續三天。每天早上就要跑醫院一趟再上班。 幸好也完成了。 第二次抽血...