Network

LL

Static IP Address on Ubuntu Server 24.04/22.04 LTS

root@host:~# sudo apt install network-managerroot@host:~# sudo systemctl restart NetworkManagerroot@host:~# ip aroot@host:~# netplan applyroot@host:~# ip a

Run following ip command to view the ip address on interface,

$ ip addr show ens33

To view the default route, run

$ ip route show

sudo systemctl restart systemd-networkdsudo systemctl restart systemd-resolved.service

sudo cp /etc/netplan/00-installer-config.yaml /etc/netplan/00-installer-config.yaml.ORG sudo vi /etc/netplan/00-installer-config.yaml

network: ethernets:   eth0:     dhcp4: false     addresses:       - 172.26.137.116/20     routes:       - to: 0.0.0.0/0         via: 172.26.128.1 version: 2

                  ----------------X--------------------

network:  version: 2  renderer: networkd  ethernets:        eth:            addresses: ['192.168.81.27/22']            routes:              - to: default                via: 192.168.80.167            match:                name: en*
              ----------------------------------------------------

vi /etc/resolv.conf

sudo rm /etc/resolv.confsudo touch /etc/resolv.conf

Edit it and add your DNS server IP(s):

nameserver 1.1.1.1nameserver 8.8.8.8

                  --------------------------------------------

root@mail:~# vi /etc/netplan/50-cloud-init.yaml
# This file is generated from information provided by the datasource. Changes# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:# network: {config: disabled}network:    ethernets:        ens160:            dhcp4: true            nameservers:                addresses: [127.0.0.53]                search: [.]        ens192:            addresses: ['192.168.82.123/22']            nameservers:                addresses: [127.0.0.53]                search: [.]            routes:              - to: default                via: 192.168.80.167    version: 2

root@mail:~# netplan apply
root@mail:~# sudo systemctl restart systemd-networkd            sudo systemctl restart systemd-resolved.service

Configure a static IP address

To configure a static IP address, first, create a YAML file with the following command:

touch /etc/netplan/01-network-configuration.yaml

Once created, open it with your favorite editor and paste the following lines of code:

network: version: 2 renderer: NetworkManager ethernets: eth0: addresses: - 192.168.1.21/24 nameservers: addresses: [8.8.8.8, 8.8.4.4] routes: - to: default

via: 192.168.1.1

-----------------------------------------------------------------
$ sudo vi 00-installer-config.yaml# This is the network config written by 'subiquity'network: renderer: networkd ethernets: ens33: addresses: - 192.168.1.247/24 nameservers: addresses: [4.2.2.2, 8.8.8.8] routes: - to: default via: 192.168.1.1

version: 2

---------------------------Ubuntu 24-----------------------------

root@mail:~# vi /etc/netplan/50-cloud-init.yaml
# network: {config: disabled}network: ethernets: ens160: addresses: ['192.168.81.245/22'] nameservers: addresses: [1.1.1.1, 8.8.8.8] search: [.] routes: - to: default via: 192.168.80.167 version: 2~

LL

ll

---

Network Settings

# ifconfig -a# ip a
# ip link# sudo netplan generate# ip addr show dev ens3
systemctl restart NetworkManager.serviceservice network-manager restartsystemctl restart systemd-resolved

apt-get install network-manager

$ sudo systemctl start NetworkManager.service

$ sudo systemctl enable NetworkManager.service

$ nmtui

apt install net-tools

# apt-get install ifupdown

# ifdown enp0s3; ifup enp0s3

apt-get install ifupdown

apt-get install ifupdown2

apt-get install netscript-2.4

# ip link set dev eth0 up

# ip link set dev eth0 down

# /sbin/ifconfig eth0 up

# /sbin/ifconfig eth0 down

# sudo ip addr add 10.102.66.200/24 dev enp2s0

# ip link set dev enp2s0 up

# ip link set dev enp2s0 down

# sudo ip route add default via 10.102.66.1

# ip route show

# ifconfig -a

# netplan generate

apt install net-tools

$ ip a

$ ifconfig enp0s3 up
$ ifconfig enp0s3 down

# cp /etc/netplan/00-installer-config.yaml /etc/netplan/00-installer-config.yaml.copy

# vi /etc/netplan/00-installer-config.yaml

**** 2 network interfaces *******

LAN: enp0s3 WAN: enp0s8

# cd /etc/netplan

$ sudo nano /etc/netplan/50-cloud-init.yaml [ Ubuntu 18.04]

# vim /etc/netplan/01-netcfg.yaml

---------------------------------------------

# vi /etc/netplan/01-systemd-networkd.yaml

---------------------------------------# This file describes the network interfaces available on your system# For more information, see netplan(5).network: version: 2 renderer: networkd ethernets: ens160: addresses: ['192.168.51.230/22'] nameservers: addresses: [1.1.1.1, 8.8.8.8] ens192: addresses: ['203.33.192.254/29'] gateway4: 203.33.192.253 nameservers: addresses: [1.1.1.1, 8.8.8.8]

---------network: version: 2 ethernets: enp0s3: addresses: [192.168.0.128/24] gateway4: 192.168.0.1 nameservers: search: [yourdomain] addresses: [8.8.8.8,8.8.4.4] enp0s8: addresses: [192.168.56.128/24] ----------------------------------

# netplan apply

# network: {config: disabled}

network: ethernets: ens33: addresses: - 192.168.1.27/24 gateway4: 192.168.1.1 nameservers: addresses: - 8.8.8.8 ens34: addresses: - 192.168.124.132/24 nameservers: {} version: 2~

---------------

network: version: 2 renderer: networkd ethernets: ens3: dhcp4: no addresses: - 192.168.121.199/24 gateway4: 192.168.121.1 nameservers: addresses: [8.8.8.8, 1.1.1.1]

# sudo netplan apply

# ip addr show dev ens3

--------------DHCP--------------

# sudo nano /etc/netplan/01-netcfg.yaml
/etc/netplan/01-netcfg.yamlnetwork: version: 2 renderer: networkd ethernets: ens3: dhcp4: yes
-------------------2 LAN------------------------# This file describes the network interfaces available on your system# For more information, see netplan(5).network: version: 2 renderer: networkd ethernets: enp0s3: dhcp4: yes enp0s8: dhcp4: no dhcp6: no addresses: [192.168.56.110/24, ] gateway4: 192.168.56.1 nameservers: addresses: [8.8.8.8, 8.8.4.4]

---------------------------------------------------------------------

------------

### 1 LAN card

enp0s8:

dhcp4: no

dhcp6: no

addresses: [192.168.56.110/24, ]

gateway4: 192.168.56.1

nameservers:

addresses: [8.8.8.8, 8.8.4.4]

#### 2 LAN Card

# This file describes the network interfaces available on your system

# For more information, see netplan(5).

network:version: 2renderer: networkdethernets:enp0s3:dhcp4: yesenp0s8:dhcp4: nodhcp6: noaddresses: [192.168.56.110/24, ]gateway4: 192.168.56.1nameservers:addresses: [8.8.8.8, 8.8.4.4] -----------------------------------------------------

# vi /etc/netplan/01-netcfg.yaml

----------STATIC------------------

network: version: 2 renderer: networkd ethernets: enp0s3: dhcp4: no dhcp6: no addresses: [192.168.1.110/24] gateway4: 192.168.1.1 nameservers: addresses: [8.8.8.8,8.8.4.4]

-------OR--------

network: ethernets: eth0: addresses: - 192.168.1.9/24 dhcp: false gateway4: 192.168.1.1 nameservers: addresses: - 192.168.1.1 - 8.8.8.8 - 8.8.4.4 search: [] version: 2

----Static 2-------------------------------------------network: ethernets: eth0: addresses: - 192.168.1.9/24 dhcp: false gateway4: 192.168.1.1 nameservers: addresses: - 192.168.1.1 - 8.8.8.8 - 8.8.4.4 search: [] eth0: addresses: - 192.168.1.9/24 dhcp: false version: 2 ----------------------DHCP------------------network: version: 2 ethernets: enp0s3: addresses: [] dhcp4: true -----OR----network: version: 2 renderer: networkd ethernets: enp0s3: dhcp4: yes

-------------------------------------------------------

# $sudo netplan apply

# netplan apply

Set Dynamic DHCP IP Address in Ubuntu

# vim /etc/netplan/01-netcfg.yaml

# This file describes the network interfaces available on your system

# For more information, see netplan(5).

network:

version: 2

renderer: networkd

ethernets:

enp0s8:

dhcp4: yes

dhcp6: yes

Once done save and close the file and apply

$ sudo netplan apply

$ ifconfig -a

sudo ifconfig sudo ip addr show

ip addr show dev enp0s8

sudo netplan --debug apply

systemctl restart NetworkManager.service

service network-manager restart

# systemctl restart systemd-resolved

Make the configuration effective (no reboot needed):

# ifdown --force enp0s3 lo && ifup -a # systemctl unmask networking # systemctl enable networking # systemctl restart networking

---

BEST

root@log:~# vi /etc/netplan/01-netcfg.yaml

--------------------

# This file describes the network interfaces available on your system For more# information, see netplan(5).network: version: 2 renderer: networkd ethernets: ens160: dhcp4: no addresses: - 203.11.193.154/29 gateway4: 203.11.193.153 nameservers: addresses: [1.1.1.1, 8.8.8.8] ens192: dhcp4: yes

------------------------------------------------

# vi /etc/netplan/01-systemd-networkd.yaml

---------------------------------------# This file describes the network interfaces available on your system# For more information, see netplan(5).network: version: 2 renderer: networkd ethernets: ens160: addresses: ['192.168.51.230/22'] nameservers: addresses: [1.1.1.1, 8.8.8.8] ens192: addresses: ['203.33.192.254/29'] gateway4: 203.33.192.253 nameservers: addresses: [1.1.1.1, 8.8.8.8]

------------------network: version: 2 ethernets: enp0s3: addresses: [192.168.0.128/24] gateway4: 192.168.0.1 nameservers: search: [yourdomain] addresses: [8.8.8.8,8.8.4.4] enp0s8: addresses: [192.168.56.128/24]