DDoS-Filtered IP Configuration

Step 1: Log into your server

Connect via SSH to your instance.

Step 2: Get root access

sudo -i

Step 3: Create configuration file

nano /etc/netplan/60-filtered-ip.yaml

Step 4: Add configuration

Add the following, replacing it with your IP and interface information:

network:
  version: 2
  ethernets:
    <adapter name>:
      addresses:
        - <your filtered IP>/<netmask>
      gateway4: <filtered IP gateway>
      nameservers:
        addresses: [8.8.8.8, 8.8.4.4]

Step 5: Apply changes

Apply your changes:

netplan apply

Or verify first with:

netplan try

Step 6: Verify configuration

Confirm the IP was added properly:

ip addr show

Step 1: Disable cloud-init network

Create a new cloud-init configuration file:

/etc/cloud/cloud.cfg.d/95-debian-network-config.cfg

With contents:

network: {config: disabled}

Step 2: Comment out cloud-init interface

Edit /etc/network/interfaces.d/50-cloud-init.cfg and comment all lines related to eth0 (or any interface you want to statically configure).

Step 3: Configure static IP

Edit /etc/network/interfaces. Replace iface eth0 inet dhcp with:

iface eth0 inet static
    address <your IPv4 address>/24
    gateway <your IPv4 gateway>

Step 4: Add IPv6 (optional)

You can add IPv6 the same way:

iface eth0 inet6 static
    address <your IPv6 address>/64
    gateway <your IPv6 gateway>

Step 5: Apply changes

Save and close the file. Then run:

ifdown eth0;ifup eth0

Or simply reboot:

reboot

Step 1: Log into your server

Connect via SSH to your instance.

Step 2: Get root access

sudo -i

Step 3: Add the filtered IP using nmcli

Use NetworkManager's command-line tool to add your filtered IP:

nmcli connection modify "System eth0" +ipv4.addresses "<your filtered IP>/<netmask>"
nmcli connection modify "System eth0" ipv4.gateway "<filtered IP gateway>"
nmcli connection modify "System eth0" ipv4.dns "8.8.8.8,8.8.4.4"
nmcli connection modify "System eth0" ipv4.method manual

Step 4: Apply changes

Restart the connection to apply changes:

nmcli connection down "System eth0"
nmcli connection up "System eth0"

Step 5: Alternative - Edit config file directly

You can also edit the network configuration file directly:

nano /etc/sysconfig/network-scripts/ifcfg-eth0

Add or modify the following lines:

BOOTPROTO=static
IPADDR=<your filtered IP>
NETMASK=<your netmask>
GATEWAY=<filtered IP gateway>
DNS1=8.8.8.8
DNS2=8.8.4.4

Step 6: Restart networking

Apply the changes by restarting the network service:

systemctl restart NetworkManager

Or reboot the server:

reboot

Step 7: Verify configuration

Confirm the IP was added properly:

ip addr show