how to Assign Multiple IP Addresses to One Single Network Interface in Linux

The concept of creating or configuring multiple IP addresses on a single network interface is called IP aliasing. IP aliasing is very useful for setting up

Source: Create Multiple IP Addresses to One Single Network Interface

Assign Multiple IP Addresses to One Single Network Interface

1. The device network (NIC) files located in “/etc/sysconfig/network-scripts/” directory.
2. Navigate to the directory and do “ls -l” to list all devices.

                cd /etc/sysconfig/network-scripts/

ls –l

[root@******** network-scripts]# ls -l

total 236

-rw-r–r–. 1 root root   394 Nov  5 13:13 ifcfg-ens192

3. Copy existing parameters of interface “ifcfg- ens192” in virtual interfaces called ifcfg- ens192:0, ifcfg- ens192:1 and ifcfg- ens192:2.

cp ifcfg- ifcfg-ens192 ifcfg- ifcfg-ens192:0

                                cp ifcfg- ens192 ifcfg- ens192:1

                                cp ifcfg- ens192 ifcfg- ens192:2

4. edit each file and rename the DEVICE name to its corresponding alias and change the IPADDR address.

For example:

DEVICE=” ens192 ” replace with ens192:0

BOOTPROTO=static

ONBOOT=yes

TYPE=”Ethernet”

IPADDR=172.16.16.125 replace with the new virtual IP.

NETMASK=255.255.255.224

GATEWAY=172.16.16.100

HWADDR=00:0C:29:28:FD:4C

5. Once, you’ve made all changes, save all your changes and restart/start the network service for the changes to reflect.

[root@*************]# /etc/init.d/network restart

How to Assign Multiple IP Address Range

1. if you would like to create a range of Multiple IP Addresses to a particular interface called “ifcfg-eth0“.

cd /etc/sysconfig/network-scripts/

cp -p ifcfg-eth0 ifcfg-eth0-range0

2. Now open “ifcfg-eth0-range0” file and add “IPADDR_START” and “IPADDR_END” IP address range as shown below.

[root@***********]# vi ifcfg-eth0-range0

 

#DEVICE=”eth0″

#BOOTPROTO=none

#NM_CONTROLLED=”yes”

#ONBOOT=yes

TYPE=”Ethernet”

IPADDR_START=172.16.16.126

IPADDR_END=172.16.16.130

IPV6INIT=no

#GATEWAY=172.16.16.100

3. Save it and restart/start network service

[root@**************]# /etc/init.d/network restart

how to Output File Sizes in Different Formats in PowerShell

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Source: Outputting File Sizes in Different Formats – Power Tips – PowerShell.com – PowerShell Scripts, Tips, Forums, and Resources

<#

When you store a number in a variable, you may want to display the number in different units. Bytes are very precise, but sometimes displaying the bytes as kilobytes or megabytes would be more appropriate.

Here is a clever trick that overwrites the internal ToString() method with a more versatile one: it takes a unit, the number of digits you want, and the text of a suffix. This way, you can display the number in various formats, just as needed.

The content stays untouched, so the variable still holds an integer value that you can safely sort or compare to other values:

#requires -Version 1

#>

$a = 1257657656
$a = $a | Add-Member -MemberType ScriptMethod -Name tostring -Force -Value { param($Unit = 1MB, $Digits=1, $Suffix=’ MB’) “{0:n$Digits}$Suffix” -f ($this/($Unit)) } -PassThru

<#

And here are some examples on how you can use $a now:
PS> $a
1.199,4 MB

PS> $a.ToString(1GB, 0, ‘ GB’)
1 GB

PS> $a.ToString(1KB, 2, ‘ KB’)
1.228.181,30 KB

PS> $a -eq 1257657656
True

PS> $a -eq 1257657657
False

PS> $a.GetType().Name
Int32

#>