Cantech Cloud

Category: Networking

  • Assign Multiple Secondary IPs on Different Operating Systems

    Assign Multiple Secondary IPs on Different Operating Systems

    Linux (RHEL / CentOS / Alma Linux / Rocky Linux)

    Method 1: Permanent Configuration (Alma Linux 8/9, Rocky Linux 8/9)

    Edit the network configuration:

    Bash
    nmcli connection modify eth0 +ipv4.addresses 192.168.1.101/24
nmcli connection modify eth0 +ipv4.addresses 192.168.1.102/24
nmcli connection modify eth0 +ipv4.addresses 192.168.1.103/24
nmcli connection up eth0

    Verify:

    Bash
    nmcli connection show eth0
ip addr show eth0

    Ubuntu 20.04 / 22.04 / 24.04

    Edit Netplan configuration:

    Bash
    nano /etc/netplan/00-installer-config.yaml

    Example:

    Bash
    network:
version: 2
ethernets:
ens18:
addresses:
– 192.168.1.100/24
– 192.168.1.101/24
– 192.168.1.102/24
– 192.168.1.103/24
gateway4: 192.168.1.1
nameservers:
addresses:
– 8.8.8.8
– 1.1.1.1

    Apply:

    Bash
    netplan generate
netplan apply

    Verify:

    Bash
    ip addr

    Debian 11 / 12

    Edit:

    Bash
    nano /etc/network/interfaces

    Example:

    Bash
    
auto ens18
iface ens18 inet static
address 192.168.1.100
netmask 255.255.255.0
gateway 192.168.1.1
auto ens18:0
iface ens18:0 inet static
address 192.168.1.101
netmask 255.255.255.0
auto ens18:1
iface ens18:1 inet static
address 192.168.1.102
netmask 255.255.255.0
auto ens18:2
iface ens18:2 inet static
address 192.168.1.103
netmask 255.255.255.0

    Restart networking:

    Bash
    systemctl restart networking

    Assign Multiple Secondary IPs on Windows Server 2016 / 2019 / 2022 / 2025

    Method:  GUI Method

    • Open Network Connections
    • Right-click Network Adapter → Properties
    • Select Internet Protocol Version 4 (TCP/IPv4) → Properties
    • Click Advanced
    • Under IP addresses, click Add
    • Add each secondary IP:
      192.168.1.101
      192.168.1.102
    • Click OK

    PowerShell Method

    PowerShell
    New-NetIPAddress -InterfaceAlias “Ethernet” -IPAddress 192.168.1.101 -PrefixLength 24
New-NetIPAddress -InterfaceAlias “Ethernet” -IPAddress 192.168.1.102 -PrefixLength 24
New-NetIPAddress -InterfaceAlias “Ethernet” -IPAddress 192.168.1.103 -PrefixLength 24

    Verify:

    PowerShell
    Get-NetIPAddress