Configure Debian with Multiple IP Addresses
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.
IPv4 Info
IPv6 Info
Example for Debian 9 and 10
Configure the public network with three public IPv4 addresses and two public IPv6 addresses. Configure two private networks.
Populate /etc/network/interfaces with:
auto lo
iface lo inet loopback
auto ens3
iface ens3 inet static
address 192.0.2.101
netmask 255.255.254.0
gateway 192.0.2.1
dns-nameservers 192.0.2.200
post-up ip route add 169.254.0.0/16 dev ens3
iface ens3 inet6 static
address 2001:db8:1000::100
netmask 64
up /sbin/ip -6 addr add dev ens3 2001:db8:1000::200
dns-nameservers 2001:db8:1000::1
auto ens3:1
iface ens3:1 inet static
address 192.0.2.102
netmask 255.255.255.255
auto ens3:2
iface ens3:2 inet static
address 192.0.2.103
netmask 255.255.255.255
# Private network 1
auto ens7
iface ens7 inet static
address 10.1.1.100
netmask 255.255.240.0
mtu 1450
# Private network 2
auto ens8
iface ens8 inet static
address 10.1.1.200
netmask 255.255.240.0
mtu 1450
Restart networking or reboot to activate the network changes.
# systemctl restart networking.service
Example for Debian 7 and 8
Configure the public network with three public IPv4 addresses and two public IPv6 addresses. Configure two private networks.
Populate /etc/network/interfaces with:
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 192.0.2.101
netmask 255.255.254.0
gateway 192.0.2.1
dns-nameservers 192.0.2.200
post-up ip route add 169.254.0.0/16 dev eth0
iface eth0 inet6 static
address 2001:db8:1000::100
netmask 64
up /sbin/ip -6 addr add dev eth0 2001:db8:1000::200
dns-nameservers 2001:db8:1000::1
auto eth0:1
iface eth0:1 inet static
address 192.0.2.102
netmask 255.255.255.255
auto eth0:2
iface eth0:2 inet static
address 192.0.2.103
netmask 255.255.255.255
# Private network: net5eea3b295857e
auto eth1
iface eth1 inet static
address 10.1.1.100
netmask 255.255.240.0
mtu 1450
# Private network: net5eea4e6f7f6c8
auto eth2
iface eth2 inet static
address 10.1.1.200
netmask 255.255.240.0
mtu 1450
Restart networking or reboot to activate the network changes.
# systemctl restart networking.service
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