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IP addresses, gateways, and reverse DNS (rDNS)

Understanding your VPS IP address

Each KVM VPS is provisioned with at least one public IPv4 address. This address is how the outside world reaches your server. You can find your assigned IP(s) in the Client Area on the VPS product page under the Server Information section. For Linux, you can also run ip addr or ip a to list interfaces and their addresses.

Default gateway and netmask

The default gateway is the router your VPS uses to reach other networks. It is automatically configured via DHCP on our network. You can view the default route using ip route in Linux or route print on Windows. Normally you do not need to change the gateway; if you manually configure networking, use the values provided in the Client Area or in your welcome email.

Additional IP addresses

If you have purchased extra IPs, they will be listed in your service details. You can add them as secondary addresses to your network interface. For example, on Linux:

# add a second IP temporarily
ip addr add 203.0.113.2/32 dev eth0

# make the change persistent
# edit /etc/network/interfaces or /etc/netplan/* depending on your distribution

Configuring reverse DNS (rDNS)

Reverse DNS (also known as PTR record) maps your IP address back to a domain name. This is important for email delivery and branding. You can set your own rDNS record for your VPS IP in the Client Area:

  • Navigate to Services → My Services and open your VPS.
  • Look for the Reverse DNS or Hostname / rDNS section.
  • Enter a fully-qualified domain name (FQDN) that resolves to your IP (ensure you have created an A record pointing the domain to your IP).
  • Save the change. It may take some time for the PTR record to propagate.

If you need to set rDNS for additional IPs, repeat the process for each IP.

Tips

  • Your server’s hostname should match the rDNS entry for best practice, especially for mail servers.
  • Do not assign private address ranges (e.g., 192.168.x.x, 10.x.x.x) to public-facing interfaces.
  • If you are unsure of your IP configuration, contact IllusionCloud support before making changes.
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