Networking.

Configuring Networking

Your assigned IPs, gateway, and interface name can be found in your onboarding email, or by messaging us. Throughout this guide, YOUR_PUBLIC_IP refers to your routable 23.131.76.x address, and YOUR_PRIVATE_IP refers to the native address used for internal routing on the host, typically acquired through DHCP.

ifupdown2

Apply the configuration immediately so you don’t need a reboot:

ip addr add dev YOUR_INTERFACE YOUR_PUBLIC_IP/32
ip route replace default via GATEWAY_IP src YOUR_PUBLIC_IP

Persist it by adding the following to /etc/network/interfaces:

post-up ip addr add dev YOUR_INTERFACE YOUR_PUBLIC_IP/32
post-up ip route replace default via GATEWAY_IP src YOUR_PUBLIC_IP

NetworkManager

Create a script at /etc/NetworkManager/dispatcher.d/post-up.sh:

#!/usr/bin/env bash
interface=$1
event=$2

if [[ $interface != "YOUR_INTERFACE" ]] || [[ $event != "up" ]]; then
    exit 0
fi

ip addr add dev YOUR_INTERFACE YOUR_PUBLIC_IP/32
ip route replace default via GATEWAY_IP src YOUR_PUBLIC_IP

Make it executable:

chmod +x /etc/NetworkManager/dispatcher.d/post-up.sh

The script will run automatically when the interface comes up.

Netplan

First, remove cloud-init to prevent it from overwriting your network config on reboot:

sudo apt remove cloud-init

Then edit /etc/netplan/50-cloud-init.yaml:

network:
  version: 2
  ethernets:
    YOUR_INTERFACE:
      addresses:
        - YOUR_PRIVATE_IP/24
        - YOUR_PUBLIC_IP/32
      routes:
        - to: default
          via: GATEWAY_IP
          from: YOUR_PUBLIC_IP
      mtu: 1500
      nameservers:
        addresses: [8.8.8.8, 8.8.4.4]

Apply with automatic rollback so if you lose connectivity, it reverts after 120 seconds:

sudo netplan try

Press Enter to confirm if everything looks good.

systemd-networkd

Create a .network file in /etc/systemd/network/, for example /etc/systemd/network/10-YOUR_INTERFACE.network:

[Match]
Name=YOUR_INTERFACE

[Network]
DHCP=ipv4
Address=YOUR_PUBLIC_IP/32

[DHCPv4]
RoutesToDNS=false
UseRoutes=false

[Route]
Destination=0.0.0.0/0
Gateway=GATEWAY_IP
PreferredSource=YOUR_PUBLIC_IP

[DHCP]
UseDomains=no
RouteMetric=200

[Link]
RequiredForOnline=routable

Reload the configuration:

networkctl reload