Important Port Numbers

Here is a list of important port numbers categorized by the type of use

Databases
3306	MySQL
1433	MS SQL Server
5432	PostgreSQL
Remote Access - Graphical
3389	MS Remote Desktop
5800	VNC-HTTP
5900	VNC
Remote Access - Console
22	SSH
23	Telnet
512	Rexec
513	Rlogin
514	RSH
Remote Data Transfer & Management
20	FTP Data
21	FTP
69	TFTP
2049	NFS
Directory Service
389	LDAP
636	LDAP Secure
Web
80	HTTP
443	HTTPS
3128	Squid Web Proxy
Mail & Chat
25	SMTP
110	POP3
995	POP3S
143	IMAP
993	IMAPS
5222	Jabber
5223	Jabber SSL
Infrastructure Management
53	DNS
1512	WINS
67	DHCP Server
68	DHCP Client
123/UDP	NTP
161	SNMP

MMC Snap-ins

Following is a list of MMC (Microsoft Management Console) snapins which you can launch from Start -> Run

MMC	Description
certmgr.msc	Certificate Manager
ciadv.msc	Indexing Service
compmgmt.msc	Computer management
devmgmt.msc	Device Manager
dfrg.msc	Disk Defragment
diskmgmt.msc	Disk Management
fsmgmt.msc	Shared Folders Management
eventvwr.msc	Event Viewer
gpedit.msc	Group Policy
lusrmgr.msc	Local Users and Groups
ntmsmgr.msc	Removable Storage
perfmon.msc	Performance Manager
secpol.msc	Local Security Settings
services.msc	System Services
wmimgmt.msc	Windows Management Instrumentation Manager

This information is based on Windows XP Professional/2003

Control Panel Applets

Many components of Control Panel can be launched from Start->Run independantly. All of these components have the extention 'cpl'. These independant components are called control panel applets.

Applet	Description
access.cpl	Accessibility Options
hdwwiz.cpl	Add New Hardware Wizard
appwiz.cpl	Add/Remove Programs
timedate.cpl	Date and Time Properties
desk.cpl	Display Properties
inetcpl.cpl	Internet Explorer Properties
joy.cpl	Joystick/Game Controller Properties
main.cpl keboard	Keyboard Properties
main.cpl	Mouse Properties
ncpa.cpl	Network Connections
telephon.cpl	Phone and Modem options
powercfg.cpl	Power Management
intl.cpl	Regional settings
mmsys.cpl sounds	Sound Properties
mmsys.cpl	Sounds and Audio Device Properties
sysdm.cpl	System Properties
nusrmgr.cpl	User settings
firewall.cpl	Firewall Settings (sp2)
wscui.cpl	Security Center (sp2)

This information is based on Windows XP Professional/2003

Application shortcuts from RUN

These application shortcuts will help you to launch many of the commonly used windows utilities from the Run option of start menu.

Shotrcut	Description
calc	Calculator
charmap	Character Map
cleanmgr	Cleans up hard drives
clipbrd	Windows Clipboard viewer
cmd	Opens a new Command Window (cmd.exe)
control	Displays Control Panel
control printers	Printers and Faxes
drwatson	Records programs crash & snapshots
dxdiag	DirectX Diagnostic Utility
explorer	Windows Explorer
ftp	ftp.exe program
iexplore	Internet Explorer
inetmgr	IIS Manager
mmc	Microsoft Management Console
msconfig	Configuration to edit startup files
msinfo32	Microsoft System Information Utility
regedit	Registry Editor
sysedit	Edit system startup files (config.sys, autoexec.bat, win.ini, etc.)
taskmgr	Task manager
sfc /scannow	System File Checker
sndrec32	Sound Recorder
sndvol32	Volume control for soundcard

This information is based on Windows XP Professional/Windows 2003

Creating Virtual File Systems in Linux

When you want to test some configuration involving file systems, its not always possible to use a live running system. In such situations it is a good idea to create a virtual filesystem in your hard disk, which will not affect the operation of your machine, except for occupying the hard disk space that you need.

The first step is to create an empty directory as the mount point for the virtual file system.
[root@LinuxBox1 ~]#mkdir /vfsmount

Now we have to create the virtual file system image. Here we will create a file vfs-image in the directory /var/vfs. This file will hold the virtual file sytem.
[root@LinuxBox1 ~]#mkdir /var/vfs

We will create a file system with a size of 100MB. For this we will have to create the file vfs-image with 100MB size.
[root@LinuxBox1 ~]#dd if=/dev/zero of=/var/vfs/vfs-image count=204800
204800+0 records in
204800+0 records out
104857600 bytes (105 MB) copied, 2.3716 seconds, 44.2 MB/s

The count option indicates how many blocks of data should be filled in the file vfs-image. By default 1 block= 512 bytes
1 MB= 512 x 2 x 1024=2048 Blocks
100 MB = 2048 x 100 Blocks = 204800 Blocks

To cross check this
[root@LinuxBox1 ~]#du -h /var/vfs/vfs-image
101M /var/vfs/vfs-image

Now format this file as an ext3 filesystem
[root@LinuxBox1 ~]#mkfs.ext3 -q /var/vfs/vfs-image
/var/vfs/vfs-image is not a block special device.
Proceed anyway? (y,n) y

'mkfs.ext3' is actually a short form for 'mkfs -t ext3'. You can avoid the warning regarding the file not being a block device by using the '-F' option

Now, to use this file system we will have to mount it. To make this mount permanent add an entry into fstab as follows

/etc/fstab

/var/vfs/vfs-image /vfsmount ext3 rw,loop 0 0

The loop option asigns an availiable loop device to the file system.

[root@LinuxBox1 ~]#mount -a
[root@LinuxBox1 ~]#mount|grep vfs-image
/var/vfs/vfs-image on /vfsmount type ext3 (rw,loop=/dev/loop0)
[root@LinuxBox1 ~]#df -h|grep vfs-image
/var/vfs/vfs-image 97M 5.6M 87M 7% /vfsmount

Now just to demonstarate that we can use this filsystem in the same way as other filesystems:
[root@LinuxBox ~]# cd /vfsmount/
[root@LinuxBox ~]# mkdir temp

Now create a 5MB sized file
[root@LinuxBox vfsmount]# dd if=/dev/zero of=/vfsmount/temp/test-space-usage count=10240
10240+0 records in
10240+0 records out
5242880 bytes (5.2 MB) copied, 0.129863 seconds, 40.4 MB/s

Check the filesystem usage
[root@LinuxBox vfsmount]# df -h|grep vfs-image
/var/vfs/vfs-image 97M 11M 82M 12% /vfsmount