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Assign Multiple IP Addresses to Single NIC in Debian 10 - How to do it ?

This article covers how to assign and remove multiple IP addresses to and from a single NIC. Based on your preferences, you can either assign the multiple IP addresses temporarily or permanently.

There's no simple command that you can run to determine whether the IP address on a Linux system is assigned by DHCP or static. 

If it changes when the system restarts, it's clearly dynamically assigned, but even a dynamic address has some resistance to change. 

The best way is to look at the configuration file.


To add a static route in Linux:

1. Use the route command with the –p option to add a persistent route: # route -p add default ip-address.

2. Use the route command with the –name option to add a persistent route by specifying a name rather than destination and gateway: # route -p add destination-address gateway-address -name name.


What is ip route command in Linux?

ip route is used to manipulate entries in the kernel routing tables. 

Route types: 

1. unicast - the route entry describes real paths to the destinations covered by the route prefix. 

2. unreachable - these destinations are unreachable. 

Packets are discarded and the ICMP message host unreachable is generated.


Assign Multiple IP Addresses to Single NIC in Ubuntu 20.04 LTS - How to do it ?

This article will guide you on how to assign multiple IP addresses to a single NIC in Ubuntu OS. Now you can allocate multiple IP addresses to a single NIC.

To change your IP address on #Linux, use the "ifconfig" command followed by the name of your network interface and the new IP #address to be changed on your computer. 

To assign the subnet mask, you can either add a "netmask" clause followed by the subnet mask or use the CIDR notation directly.

The ifconfig command can be used from the #command line either to assign an address to a #network interface or to configure or display the current network interface configuration information. 

The ifconfig command must be used at system startup to define the network address of each interface present on a machine.


To determine my IP address in Linux :

1. ifconfig -a.

2. ip addr (ip a).

3. hostname -I | awk '{print $1}'.

4. ip route get 1.2.

5. nmcli -p device show.


To add secondary IP address permanently on Ubuntu system, just edit /etc/network/interfaces file and add the requires IP details. 

Verify the newly added IP address. # ifconfig eth0