IPv4 SUBNETTING

IPv4 SUBNETTING 

Given network Address 192.168.1.0/24, you have been asked to use the given network address to do the subneting and configure the network.

Step 1: Always you need to start with the Highest IP requirement, so the highest IP requirement is 30.

Calculating network address of each network from the given classful lP address is called VLSM.

To find the classless IP network we have to first find the required host bits.

2ⁿ -2 ³REQUIRED IP      ( n is number of host bits)

2ⁿ -2 ³30

2ⁿ ³30+2

2ⁿ ³32

2ⁿ  ³2⁵

n=5

so required number of host bits = 5

that’s bring the subnet mask bits to à 32-5=27

so the network address of first network is 192.168.1.0/27

Since the network address is 192.168.1.0/27 , we should be able to find the first and last IP address in this network.

To find the first IP address, we need to convert the IP address to binary format and change all the host bits to zero (0)

192.168.1.0

11000000.10101000.00000001.00000000 (Binary format) in this first 27 bits are assigned to network and the last 5 bits assigned to Host.

11000000.10101000.00000001.000|00000, we could see all the host bits are zero so this is the first IP address in this network, but this is also the network address. There for we cannot use this address to any end device, this address is used to identify the Network

Network Address = 192.168.1.0/27

Now we need to find the last IP address,

To find the last IP address change all the host bits to one (1)

11000000.10101000.00000001.000|00000 change the host bits to one

11000000.10101000.00000001.000|11111 when you convert this to Decimal we will get the Last IP address which is called broadcast address.

11000000 = 192

10101000= 168

00000001= 1

000|11111 = 31

So, the Broadcast IP address is 192.168.1.31/27

So we can conclude this as follows, for 30 IP address requirement, we need /27 network

Which has a range from 192.168.1.0/27 --- 192.168.1.31/27

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Now we need to calculate for the second biggest network

2ⁿ -2 ³REQUIRED IP      ( n is number of host bits)

2ⁿ -2 ³15

2ⁿ ³15+2

2ⁿ ³17 since its greater than or equal we can change this to closest 2 to the power number which is 32 (1,2,4,8,16,32,64,128,256)

2ⁿ  ³32

2ⁿ  ³2⁵

n=5

so, required number of host bits = 5

that’s bring the subnet mask bits to à 32-5=27

so the network address of the second network is

we have used up to 31 , that’s mean we can start the next network from 32.

Network address is : 192.168.1.32/27

Now we need to find the last IP on this network, to do the calculation we will again convert this Network address to Binary

11000000.10101000.00000001.00100000

Last IP address has all the hosts bits set to one

11000000.10101000.00000001.001| 11111

which is 192.168.1.63 /27 in binary

so the range of the second network is 192.168.1.32/27 --- 192.168.1.63/27

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Now we can calculate the third network which has a requirement of 8 IP address

2ⁿ -2 ³REQUIRED IP      ( n is number of host bits)

2ⁿ -2 ³8

2ⁿ ³8+2

2ⁿ ³10  since its greater than or equal we can change this to closest 2 to the power number which is 16 (1,2,4,8,16,32,64,128,256)

2ⁿ  ³16

2ⁿ  ³2⁴

n=4

so, required number of host bits = 4

that’s bring the subnet mask bits to à 32-4=28

so, the network address of the second network is

we have used up to 63, that’s mean we can start the next network from 64.

Network address is: 192.168.1.64/28

Now we need to find the last IP on this network, to do the calculation we will again convert this Network address to Binary

11000000.10101000.00000001.0100|0000

Last IP address has all the hosts bits set to one

11000000.10101000.00000001.0100|1111

which is 192.168.1.79 /28 in binary

so the range of the second network is 192.168.1.64/28 --- 192.168.1.79/28

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similar way we need to calculate to N12,N23,N13, but in this network we need only 2 IP address.

How to create roaming user profile ?

How to create roaming user profile ?

We can create roaming profile in 2 different way depends on our need.

1. From Active directory users and computers.
2. From Group policy.

But for both process we need to have a shared location where profiles need to save. And also securing shared location we need to change security permission.

For shared location we create a folder named Roaming profile then right click to the folder name and click on properties.

Go to Properties and Sharing

Click Share this Folder and change the Permissions

Click add and add the following as in the screenshot

Then go and change the permissions

Everyone Only Read Permission.

Domain Admin Full Control

Authenticated User with Read and Change Permission

Click OK.

Now go to security tab in Properties.

Disable the Inheritance.

We have done the sharing and ready to configure now the Roaming Profile

Lets do

Step 1

1. From Active directory users and computers.

Go to Users and Computers, and select the user you want to configure Roaming Profile.

Right click and go to Properties , Go to Profile Tab.

In Profile Path give your shared folders path with %username%

Type 1:

Type 2 :  Find the shared path from the Network Path and copy it.

Using the copied shared network path with %username%

Thats all. we are done.

Method 2:

Using GPO

Create a new Group Policy under  Domains and Edit it.

Go to  Computer Policy->Computer Configuration->administrative Templates->System->User Profiles.

Enable Set roaming profile path for all users logging into this computer and provide the shared location with %username% then click OK.

Also enable Add the Administrators security group to roaming profiles.

All Done........

Configure Shared office365 MailBox on iPhone Mail app

start setting up a normal exchange account , put your shared email address in the username and you main email account password.

Open Settings

Open "Mail, Contacts, Calendars"

Choose "Add Account..."

Choose "Other"

On the next screen, select "Add Mail Account"

it will fail to do the auto-discover thing , but when you click on continue it eil allow you to manually enter the details :

Name : Hello

email : your shared email a/c address  i.e hello@test.com 

description :

incoming mail

Host name : outlook.office365.com

username : your main email address / shared i.e  Saththiyan@test.com/hello 

password : your main account password; i.e password of Saththiyan@test.com

outgoing mail server:

SMTP : smtp.office365.com

username : saththiyan@test.com

password : your main account password, password of Saththiyan@test.com

use ssl 

authentication : Password

Remote Desktop Profile keep deleting.

I have noticed one issue with RDS service. I created a user and noticed that the user kept me asking twice to configure his email account as it disappeared suddenly.

went through some troubleshooting and found that the user profile is missing under C:\Users on my RDS server user profile.

As per the google search it's a bug in RDS and the way to troubleshoot is deleting registry entry and login again. Even i was able to noticed that the specific user profile was in registry with ".bak"

 the registry to delete is , Just right click and delete the Key and log in the user again.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList

After i logged in i was able to see the registry with out .bak and now i could be able to see that the user profile is in my Users drive.

Thanks.
Sathi

Create new Alias on Office Cloud mail 365.

Hear we go with another new topic,

We all must be wondering how we can save the license cost for number of email account hosted with cloud mail exchange.

Easiest way to save some money is creating an Alias ,

Alias can be given as an email account and it will attached to an email account.

say for an example i got a mail address call test@test.com.au and have an alias call career@test.com

When some one send mail to career@test.com.au it will come to my mail box test@test.com.au but i cannot reply from career@test.com.au

when i reply it will go as test@test.com.au.

lets see how we can setup this...

Login to office 365 mail  portal

 Click on Admin then go to users

It will take you users and you need to edit the user

Click on the Edit next to user name and add Alias

Now add the email you want for Alias 

That is all. Alias is ready to use,.....

Domain Name Transfer

Lets have a look on how we can transfer a domain from one management to another user management.

Before you transfer you must have the following information

1) Domain Password : XXXXXXXX
2) Change the contact mail address : call to the previous company who manages the domain and ask to update the email address , This is where you will get the Authorisation code once the domain transferred.  You need this code to complete the transfer.



Now go to GoDaddy.com , click on Domain and then Domain Transfer.

Enter the domain name you want to transfer. 

Enter the Authorization code ( Domain Password) 

Click Continue and Finish the Transfer. 

Now login to your GoDaddy Account and go to domain . Click Transfer 

Then click on Manage. 

Now you have to login to the email account that you have updated to receive email notification from domain and find the information 

Transaction ID: ‎XXXXXXXX

Security Code: XXXXXXXXX

Enter the following information below 

Click Add 

Click Next 

Click Finish , Thats all. Domain is Transferred 

Install Zimbra 8.6 on Ubuntu 15.04 Server

Install Zimbra 8.6 on Ubuntu 15.04

The Zimbra Collaboration Server is a mail server, collaborative web application and a web based mail server admin console in a single application. It provides LDAP, antivirus, antispam, collaboration features and a ajax webmail client. Zimbra is easy to use for administrators as well as end users due to its fast Ajax based web interface.

Prerequisites
• Ubuntu Server 15.04 - 64bit
• root privileges
• Free space 25 GB
• RAM 4 GB

My zimbra Server profile used in this Lab

Domain : faceitnet.com.au
IP : 192.168.200.10
Mail : mail.faceitnet.com.au


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Installation of prerequisites

connect to your server, get root privileges and install this package.

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apt-get install libgmp10 libperl5.18 unzip pax sysstat sqlite3 dnsmasq wget

Configure hostname and DNS Server

Step 1 - Edit hostname and hosts

vim /etc/hostname

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change your hostname with this 'zimbramail.faceitnet.com.au'.

vim /etc/hosts

add this line:

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192.168.200.10   zimbramail.faceitnet.com.au zimbramail

Step 2 - Edit dnsmasq configuration

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vim /etc/dnsmasq.conf

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server=192.168.200.10

domain=faceitnet.com.au

mx-host=faceitnet.com.au, zimbramail.faceitnet.com.au, 5

mx-host= zimbramail.faceitnet.com.au, zimbramail.faceitnet.com.au, 5

listen-address=127.0.0.1

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Reboot

Installing Zimbra

Step 1 - Download Zimbra and extract it

Download using the following command if Download doesn’t work then download manually and upload to server using FTP service. (Need to configure FTP)

--> wget https://files.zimbra.com/downloads/8.6.0_GA/zcs-8.6.0_GA_1153.UBUNTU14_64.20141215151116.tgz

Extract the file using the following command:

Change the directory to extracted directory:

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cd zcs*

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Now install the package by run the ./install.sh command

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Continue the installation by Pressing Y

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You need to wait, because this installation takes some time.

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next step is configure "zimbra-store" for getting admin password.

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In my configuration you could see my Master DNS IP address was not configured, so I had to configure it to finish the configuration, Until that you will not be permitted to Apply configuration ( a to apply Configuration )

It will take some time to finalize all the configuration

Testing Zimbra

To test your zimbra server is running, you can type a command

su - zimbra

zmcontrol status

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try to access zimbra from web browser.  https://192.168.200.10/

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or try admin page " https://192.168.200.10:7071/ ".

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Once you have configured the Zimbra mail server, test the server by sending mails from two acceounts that you have created.

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