Configure VzLinux with Multiple IP Addresses

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Introduction

A basic network configuration at Vultr consists of a single IPv4 address, configured by DHCP. If you have advanced networking requirements, Vultr supports multiple public IPs and up to five private networks. You need to manually configure these advanced scenarios. Refer to the networking configuration page in the customer portal for your exact configuration. This example demonstrates three public IPv4 addresses, two private IPv4 networks, and two public IPv6 addresses.

Note: Your network adapter names may not match the examples. See our article How to Find the Network Adapter Names for a Vultr Cloud Server.

IPv4 Info

IPv6 Info

Example

Public Network

1. Define three public IPv4 addresses and two public IPv6 addresses on adapter ens3.
   Populate /etc/sysconfig/network-scripts/ifcfg-ens3 with:

   TYPE="Ethernet"
   DEVICE="ens3"
   ONBOOT="yes"
   BOOTPROTO="none"
   IPADDR=192.0.2.101
   PREFIX=23
   GATEWAY=192.0.2.1
   DNS1=192.0.2.200
   IPADDR1=192.0.2.102
   PREFIX1=32
   IPADDR2=192.0.2.103
   PREFIX2=32
   IPV6INIT="yes"
   IPV6_AUTOCONF="yes"
   IPV6ADDR_SECONDARIES="2001:db8:1000::100 2001:db8:1000::200" 
   

2. Restart the connection or reboot.

   # nmcli con load /etc/sysconfig/network-scripts/ifcfg-ens3
   # nmcli con up 'System ens3'
   

Private Network

1. Define the first private network on adapter ens7.
   Populate /etc/sysconfig/network-scripts/ifcfg-ens7 with:

   TYPE="Ethernet"
   DEVICE="ens7"
   ONBOOT="yes"
   BOOTPROTO="none"
   IPADDR=10.1.1.100
   PREFIX=20
   MTU=1450
   

2. Restart the connection or reboot.

   # nmcli con load /etc/sysconfig/network-scripts/ifcfg-ens7
   # nmcli con up 'System ens7'
   

3. Define the second private network on adapter ens8.
   Populate /etc/sysconfig/network-scripts/ifcfg-ens8 with:

   TYPE="Ethernet"
   DEVICE="ens8"
   ONBOOT="yes"
   BOOTPROTO="none"
   IPADDR=10.1.1.200
   PREFIX=20
   MTU=1450
   

4. Restart the connection or reboot.

   # nmcli con load /etc/sysconfig/network-scripts/ifcfg-ens8
   # nmcli con up 'System ens8'
   

Nameservers

Verify that /etc/resolv.conf has your preferred nameservers for IPv4, and optionally IPv6.

domain       example.com
nameserver   2001:db8:1000::1
nameserver   192.0.2.200

More Resources

• How to Configure Multiple Private Networks at Vultr
• How to Configure IPv6 on your VPS