The principal of a gateway is every packet and requested through the ethernet card are will be forwarded.
Check your ip address first:

# ifconfig

eth0      Link encap:Ethernet  HWaddr 00:50:8D:63:A1:A4
inet addr:192.168.1.5  Bcast:192.168.1.255  Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
RX packets:383259 errors:0 dropped:0 overruns:0 frame:0
TX packets:376249 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:52177377 (49.7 MiB)  TX bytes:53007914 (50.5 MiB)
Interrupt:16 Base address:0xa000
To enable forwarded packet :
 # echo 1 > /proc/sys/net/ipv4/ip_forward

This means every ipv4 packet will be forwarded.
The question is forwarded to where ?
You can manage these by creating route.
# route add default gw 192.168.1.10

192.168.1.10 is internet gateway given by your modem, adsl or dial-up modem.

Test it by changing the gateway into 192.168.1.5 on one of the computer on your network( Pc A).
All requested by PC A will be go through 192.168.1.5
And of course you have to configure the firewall about this.
Meanwhile I turn off the firewall first. Because I want to do more about this gateway.

That is for now, next I will share how to handle 2 or more different connection with only 1 single gateway without creating DNS and others.

• Activate your Blackberry bluetooth and set it to Discoverable Mode ( You will see ‘waiting for connection’ message on the blackberry.
• On Ubuntu, open terminal akses root, you can use # sudo su to always work as root.
• Scan Blackberry Bluetooth using hcitool

# hcitool scan

Scanning …00:1C:CC:4C:4A:32 BlackBerry 8310

Now, scan your blackberry for other available services.# sdptool browse

Inquiring …
Browsing 00:1C:CC:4C:4A:32 …
Service Name: Dialup Networking
Service RecHandle: 0×10000
Service Class ID List:
“Dialup Networking” (0×1103)
“Generic Networking” (0×1201)
Protocol Descriptor List:
“L2CAP” (0×0100)
“RFCOMM” (0×0003)
Channel: 1
Profile Descriptor List:
“Dialup Networking” (0×1103)
Version: 0×0100

Service Name: Headset
Service RecHandle: 0×10001
Service Class ID List:
“Headset Audio Gateway” (0×1112)
“Generic Audio” (0×1203)
Protocol Descriptor List:
“L2CAP” (0×0100)
“RFCOMM” (0×0003)
Channel: 2
Language Base Attr List:
code_ISO639: 0×656e
encoding: 0×6a
base_offset: 0×100

Service Name: Hands-free
Service RecHandle: 0×10002
Service Class ID List:
“Handsfree Audio Gateway” (0×111f)
“Generic Audio” (0×1203)
Protocol Descriptor List:
“L2CAP” (0×0100)
“RFCOMM” (0×0003)
Channel: 3
Language Base Attr List:
code_ISO639: 0×656e
encoding: 0×6a
base_offset: 0×100
Profile Descriptor List:
“Handsfree” (0×111e)
Version: 0×0105

Service Name: Advanced Audio
Service Provider: BlackBerry
Service RecHandle: 0×10003
Service Class ID List:
“Audio Source” (0×110a)
Protocol Descriptor List:
“L2CAP” (0×0100)
PSM: 25
“AVDTP” (0×0019)
uint16: 0×100
Profile Descriptor List:
“Advanced Audio” (0×110d)
Version: 0×0100

Service Name: A/V Remote Control TG
Service Provider: BlackBerry
Service RecHandle: 0×10004
Service Class ID List:
“AV Remote Target” (0×110c)
Protocol Descriptor List:
“L2CAP” (0×0100)
PSM: 23
“AVCTP” (0×0017)
uint16: 0×100
Profile Descriptor List:
“AV Remote” (0×110e)
Version: 0×0100

Service Name: BlackBerry Desktop Service P:0×2DF2F542 R:0×03 V:0×20104
Service RecHandle: 0×10005
Service Class ID List:
UUID 128: 426c6163-6b42-6572-7279-44736b746f70
“Serial Port” (0×1101)
Protocol Descriptor List:
“L2CAP” (0×0100)
“RFCOMM” (0×0003)
Channel: 4
Language Base Attr List:
code_ISO639: 0×656e
encoding: 0×6a
base_offset: 0×100

Service Name: Phonebook Access PSE
Service RecHandle: 0×10006
Service Class ID List:
“Phonebook Access - PSE” (0×112f)
Protocol Descriptor List:
“L2CAP” (0×0100)
“RFCOMM” (0×0003)
Channel: 5
“OBEX” (0×0008)
Language Base Attr List:
code_ISO639: 0×656e
encoding: 0×6a
base_offset: 0×100
Profile Descriptor List:
“Phonebook Access” (0×1130)
Version: 0×0100

Service Name: BlackBerry Bypass Service P:0×2DF2F542 R:0×03 V:0×20003
Service RecHandle: 0×10007
Service Class ID List:
UUID 128: 426c6163-6b42-6572-7279-427970617373
“Serial Port” (0×1101)
Protocol Descriptor List:
“L2CAP” (0×0100)
“RFCOMM” (0×0003)
Channel: 6
Language Base Attr List:
code_ISO639: 0×656e
encoding: 0×6a
base_offset: 0×100

There you are, there are quite complete service from the blackberry.We can use it as a modem or audio gateway and transfering files.

• Now, connect/pair your Ubuntu System with the blackberry.

# rfcomm connect rfcomm0 00:1c:cc:4c:4a:32

00:1c:cc:4c:4a:32 is the id number result from hcitool scan above.

After succesfully paired, you may use nautilus and start transfering your files send to bluetooth.done.

In order to excel you must be qualified, experienced and able to perform in situations that may challenge others in your field. Some basic ways of doing this are to develop skills, develop credibility through certification and be ready to think outside the box for solutions. Gaining Knowledge And Acquiring New Skills The monotonous routine of your regular job is one of the biggest and most significant reasons for the loss of interest in your job. If you love what you do, nothing can be worse than that.

However, if you do not like your job and you continue with it out of some sort of compulsion, then it is best to break all mental barriers and come out of it. You should start learning new skills that will add value to your career prospects and help you in securing the career that you aspire for. If you are tired of doing server jobs, allow some time for acquiring Cisco skills. Similarly, you can consider learning some Linux skills if you have been working as a Microsoft Exchange specialist. Developing new skills can provide you the advantage to get the next promotion.

Getting Certified Whether you work long term for one company or are looking for other opportunities to grow elsewhere, certifications in your area of expertise add the required credibility to take on greater responsibility and earn more. Some disciplines such as medicine, accounting and law require frequent certifications to maintain the license to practice these professions. Even when such certifications are not required, it’s very important to develop a certification plan to advance your career. Consider that you are always competing for your job with others in the company and outside. Consider also who your company would prefer, a person with an impressive list of certifications or one who has stagnated in their education goals. Companies work with limited resources. Without a doubt additional certifications add to the perceived value of an employee and companies tend to reward such initiatives.

Getting Prepared For Changes Sometimes, you may need to take a step backward in order to finally move forward. If you are seen or perceived by your employer only as a “server guy” but wish to work in a different domain, be ready to work nights or do additional shifts to gain work experience in the area you prefer. You may go through some temporary financial hardships as a result of the job change, but it might prove to be your best career move in the long term. If changes are made according to your master career plan they are likely to yield much better results than simply reacting to short term situations. Do Not Get Typecast Make sure you are useful to your company in many disciplines. This is essential for job security and career growth. If you do no more than is expected of you then you are tied to the one job you do.

However if you have initiative and break the typecast of the job to do more than is required, chances are that you will be noticed and rewarded.
Tony Jacowski is a quality analyst for The MBA Journal. Aveta Solution’s Six Sigma Online offers online six sigma training and certification classes for lean six sigma, black belts, green belts, and yellow belts.
This resource is one of the master piece from expert author at FreeSubmitArticles.com.

C:\> shutdown /?

You should see a complete usage instruction.

On Windows 2000 Operating System, shutdown.exe is not included. You have to get it from it’s Distribution Kit Disc.
What if the disc is gone ?
That is the common problem from people, including me.
I have search around Search Engine, Google , yahoo, bing, etc.. etc.. They all keep saying that you have to get it from The Distribution Kit or Use the third-party softwares.

One thing I dont like from Windows Operating Systems that people easily create some variant of viruses, trojans, worms, hidding inside  the windows executable files.

Here is the trick to be able Shutdown/Restart automatic on Windows 2000.
You need Windows XP connected to your Windows 2000
Use Schedule task on windows XP to shutdown/restart the windows 2000 using shutdown.exe -m \\windows2000 -f -r
To see complete usage : c:\> shutdown /?

Please note, you need to logged on as domain administrator to be able  to shutting down Windows 2000

Firstable, I already have Qmail + Vpopmail running properly and compiled as enabled roaming user that mean is smtp authenticate feature is enabled.

Secondly, You dont need to create secure connection using CRAMD5, AUTH PLAIN, AUTH LOGIN. Dont missunderstood, these secure connections are nothing to do with open relay, if you want to enable this feature that will be great.

Third, you must edit your /etc/tcp.smtp . tcp.smtp is a file to manage connection to your smtp port. Do google about this. You will find dozen knowledge about it.
The point is you must add these line :

127.:allow,RELAYCLIENT=”"
:allow,SMTPAUTH=”"
:deny

That means, allways allow connection from localhost and always allow incoming connection that using smtp authentication and deny the rest except the “rcpt to: ” is in the /var/qmail/control/rcpthosts file.

# service qmail stop
# service qmail cdb
# service qmail start

Goog it for each details, I dont want to explain one-by-one, go for ‘life with qmail’. you will get all the information needed for qmail and components.
After searching with google for days and I tried all method and step-by-step told by people around the world but goes for nothing. The point is,  the change_pass plugin always mention poppassd as daemon to verify user-password, and poppassd always mention pam authentication. That’s why change_pass plugin never work at my mail server.

The solution is, DO NOT use poppassd, use courierpassd because the authentication module is by courier-authlib
I use courierpassd-1.1.0-RC1.tar.gz , included in qmailrocks. You can search with new version.

How to Install courierpassd ?

Easy. Here is the step from courierpassd INSTALL file

REQUIREMENTS:

The Courier authentication library.

A super-server such as tcpserver or xinetd.

INSTALLATION:

Before building courierpassd, build and install the Courier
authentication library.

To build and install courierpassd, unpack the tarball and follow these
commands.

cd /path/to/courierpassd-<version>
./configure
make
su root
make install

That’s it. If you installed the authentication library in a non-standard
place, the configure script will complain. Just follow the instructions to
tell it where to find courierauthconfig, a program that is installed as
part of the authentication library.

Courierpassd configure options are:

–with-minuid[=UID]
Sets the minimum uid for which courierpassd
will change the password. Below this uid,
attempts to change a password will always
fail. If this option is not used, or a uid
not indicated, the value defaults to 100.

–with-badpassdelay[=sec]
Sets the time in seconds that courierpassd
will sleep after a failed attempt to change
a password. This option is intended to make
brute force attacks against passwords harder
to perform. This value defaults to 3.

Use ./configure –help to see the full range of available configure
options.

If make fails on your FreeBSD system, try using gmake. Gmake is available
in the FreeBSD ports tree.

Courierpassd is installed in /usr/local/sbin.
The courierpassd man page is installed in /usr/local/man.

Courierpassd has been successfully built on:
Mandrake Linux 10.1

For courierpassd to be of any use, the Courier authentication library
must be installed and user accounts set up which can be accessed by the
installed authentication modules. See the library documentation for
details on how to do this.

SUPER-SERVER SETUP:

Because courierpassd relies on a super-server to handle network connections, it is easy to set up courierpassd to listen on whatever port is desired.
Since courierpassd uses the poppassd protocol to talk to clients, however,the use of port 106 is recommended unless there is a compelling reason to
do otherwise.

A typical xinetd entry ( /etc/xinetd.conf ) for courierpassd would look like this:

service courierpassd
{
port            = 106
socket_type     = stream
protocol        = tcp
user            = root
server          = /usr/local/sbin/courierpassd
server_args     = -s imap
wait            = no
instances       = 4
disable         = no
}

open /etc/services and change the line

poppassd        106/tcp                         # Eudora

with

courierpassd        106/tcp

# service xinetd restart

check the daemon :
# netstat -an | grep 106

you should see something like :
tcp        0      0 0.0.0.0:106                 0.0.0.0:*                   LISTEN

then test to change your email password by telnet.
# telnet localhost 106

Trying 127.0.0.1…
Connected to DOMAINNAMEYAHOO(127.0.0.1).
Escape character is ‘^]’.
200 courierpassd v1.1.0-RC1 hello, who are you?
user admin@domainnameyahoo.info
200 Your password please.
pass mypassword
200 Your new password please.
newpass mynewpassword
200 Password changed, thank-you.

Last step, installing the change_pass plugin for squirrelmail
Download the plugin here
Extract it and put it at yourwebmail folder
# tar zxvf change_pass-3.0-1.4.0.tar.gz
# mv change_pass yourwebmailfolder/plugins
activate the plugin. and done. thats it.

Rar files are compressed file, you need to decompressed it or unrar it.
There is linux software called unrar, able to read , open and extract rar files.

$ wget http://www.rarlab.com/rar/rarlinux-3.6.0.tar.gz

Untar the downloaded file
$ tar -zxvf rarlinux-3.6.0.tar.gz

Both unrar and rar commands are located in rar sub-directory. Just go to rar directory:
$ cd rar
$ ./unrar

Now copy rar and unrar to /bin directory:
# cp rar unrar /bin

To Extract Rar files use:
$ unrar x rar.file

# vi importsamba.sh

#!/bin/bash
CSVFILE=/home/domainnameyahoo/listusers.csv
CMD=`which smbldap-adduser`
for i in `cat $CSVFILE|sed ’s/, /,/g’`; do
UN=`echo $i | cut -f1 -d’,'`
PW=`echo $i | cut -f2 -d’,'`
echo $CMD$UN -P $PW
done

the CSV format is :
username1,password1
username2,password2
….

Hope this will help.

# vi /etc/networking/interfaces

auto lo eth0
iface lo inet loopback
iface eth0 inet static
address xxx.xxx.xxx.xxx(enter your ip here)
netmask xxx.xxx.xxx.xxx
gateway xxx.xxx.xxx.xxx(enter gateway ip here)

# vi /etc/resolv.conf

nameserver xxx.xxx.xxx.xxx(enter your dns server ip)
nameserver xxx.xxx.xxx.xxx(enter your alt dns server ip)

# service networking restart

Thats all.

I have Centos installed on HP Proliant Box with 13Gig of RAM Memory.
Yesterday, I was running rsync all my websites into another box in LAN.
Somehow the memory has dropped out and there is only 32Mb left on free memory.
Damn, only copying files has eating more than 12 Gigs of memory, and after rsync has finish and there is no more rsync process , the free mem won’t go back to normal. That is crazy !!.

I know you people will or even already have the same situation as I did.
Here is the tips. The secret is on /proc/sys/vm/drop_caches file.

Simply run this :

To free pagecache:
echo 1 > /proc/sys/vm/drop_caches

To free dentries and inodes:
# echo 2 > /proc/sys/vm/drop_caches

To free pagecache, dentries and inodes:
# echo 3 > /proc/sys/vm/drop_caches

Here is the example syntax and the result before and after freeing the memory.

[root@dev vm]# cd /proc/sys/vm/

[root@dev vm]# cat drop_caches
0
[root@dev vm]# free
total       used       free     shared    buffers     cached
Mem:       1132664    1085076      47588          0     194664     490084
-/+ buffers/cache:     400328     732336
Swap:      2031608          0    2031608
[root@dev vm]# sync ; echo 3 > /proc/sys/vm/drop_caches ; free
total       used       free     shared    buffers     cached
Mem:       1132664     388280     744384          0        116      48240
-/+ buffers/cache:     339924     792740
Swap:      2031608          0    2031608
You have new mail in /var/spool/mail/root
[root@dev vm]# cat drop_caches
3
[root@dev vm]# sync ; echo 0 > /proc/sys/vm/drop_caches ; free
total       used       free     shared    buffers     cached
Mem:       1132664     395952     736712          0       1336      55180
-/+ buffers/cache:     339436     793228
Swap:      2031608          0    2031608
note: don’t forget to put ‘0′ back into the drop_caches.

I still dont know if there will the any risk, until now.. everything is fine.