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[DEMO] Configure additional IPs

Add an additional IP to the network interface on Ubuntu (netplan) or Debian (ifupdown).

2026年10月18日更新約 1 分で読めます著者：Fusiora (demo)

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Find the interface name

bash

ip addr show

Look for the interface that holds your main IP (for example eth0 or enp1s0).

Edit the existing file in /etc/netplan/:

/etc/netplan/50-cloud-init.yaml

network:
  version: 2
  ethernets:
    [INTERFACE]:
      addresses:
        - [MAIN_IP]/[PREFIX]
        - [ADDITIONAL_IP]/32

Apply with automatic rollback if something goes wrong:

bash

sudo netplan try

Add these lines under the main interface:

/etc/network/interfaces

up ip addr add [ADDITIONAL_IP]/32 dev [INTERFACE]
down ip addr del [ADDITIONAL_IP]/32 dev [INTERFACE]

Then restart networking:

bash

sudo systemctl restart networking

タグ:Demo