In most cases, you should not need to adjust these files. Instances are normally configured using DHCP. You only really need to change these files if you are trying to enable additional IPs.

**Note: Changing to the examples below will cause problems if you take a snapshot of an instance and restore it on a VPS. We recommend reverting back to DHCP before taking a snapshot.

Again, keep in mind that these are EXAMPLES only. Using this WILL break your VPS or Dedicated Server. Change the IPs to your assigned IPs and you'll be good to go.**

`CentOS / RHEL`

Your IP configuration should be something similar to

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

It should contain the following, or at least something similar to ensure things work well

    DEVICE=eth0
    ONBOOT=yes
    BOOTPROTO=static
    IPADDR=45.63.69.155
    NETMASK=255.255.254.0
    GATEWAY=45.63.68.1
    DNS1=8.8.8.8

    IPV6INIT=yes
    IPV6_DEFAULTGW=2605:f700:0080:040e::1
    IPV6ADDR=2605:f700:80:040e::d7d6:f6a1/64
    IPV6_AUTOCONF="yes"
    DNS2=2001:4860:4860::8888

For additional IPs and gateways not in your initial IP assignment, they should be added as follows, keeping in mind they're examples only:

    IPADDR1="192.168.1.151"
    IPADDR2="192.168.2.152"
    GATEWAY1="192.168.1.1"
    GATEWAY2="192.168.2.1"

`/etc/sysconfig/network-scripts/route-eth0`

    169.254.0.0/16 dev eth0

`/etc/sysconfig/network-scripts/ifcfg-eth1`

    DEVICE=eth1
    ONBOOT=yes
    BOOTPROTO=static
    IPADDR=10.99.0.11
    NETMASK=255.255.0.0
    MTU=1450

`Debian 7+ / Ubuntu 12.xx - 15.xx`

`/etc/network/interfaces`

    auto lo
    iface lo inet loopback

    auto eth0
    iface eth0 inet static
    address 45.63.69.155
    netmask 255.255.254.0
    gateway 45.63.68.1
    dns-nameservers 8.8.8.8
    post-up ip route add 169.254.0.0/16 dev eth0

    iface eth0 inet6 static
    address 2001:19f0:5c00:9426:5400:00ff:fe09:bf41
    netmask 64
    dns-nameservers 2001:4860:4860::8888

    auto eth1
    iface eth1 inet static
    address 10.99.0.11
    netmask 255.255.0.0
    mtu 1450

`Ubuntu 16.xx+`

`/etc/network/interfaces`

    auto lo
    iface lo inet loopback

    auto ens3
    iface ens3 inet static
    address 45.63.69.155
    netmask 255.255.254.0
    gateway 45.63.68.1
    dns-nameservers 8.8.8.8
    post-up ip route add 169.254.0.0/16 dev ens3

    iface ens3 inet6 static
    address 2001:19f0:5c00:9426:5400:00ff:fe09:bf41
    netmask 64
    dns-nameservers 2001:4860:4860::8888

    auto ens7
    iface ens7 inet static
    address 10.99.0.11
    netmask 255.255.0.0
    mtu 1450

`FreeBSD`

`/etc/rc.conf`

    static_routes="linklocal"
    route_linklocal="-net 169.254.0.0/16 -interface vtnet0"
    ifconfig_vtnet0="inet 45.63.69.155 netmask 255.255.254.0"
    defaultrouter="45.63.68.1"

    rtsold_enable="YES"
    ipv6_activate_all_interfaces="YES"
    rtsold_flags="-aF"
    ifconfig_vtnet0_ipv6="inet6 2001:19f0:5c00:9426:5400:00ff:fe09:bf41 prefixlen 64"

    ifconfig_vtnet1="inet 10.99.0.11 netmask 255.255.0.0 mtu 1450"

`Fedora`

`/etc/sysconfig/network-scripts/ifcfg-ens3`

    DEVICE=ens3
    ONBOOT=yes
    NM_CONTROLLED=no
    BOOTPROTO=static
    NOZEROCONF=yes
    IPADDR=45.63.69.155
    NETMASK=255.255.254.0
    GATEWAY=45.63.68.1
    DNS1=8.8.8.8

    IPV6INIT=yes
    IPV6ADDR="2001:19f0:5c00:9426:5400:00ff:fe09:bf41/64"
    IPV6_AUTOCONF="yes"
    DNS2=2001:4860:4860::8888

`/etc/sysconfig/network-scripts/route-ens3`

    169.254.0.0/16 dev ens3

`/etc/sysconfig/network-scripts/ifcfg-ens7`

    DEVICE=ens7
    ONBOOT=yes
    NM_CONTROLLED=no
    BOOTPROTO=static
    NOZEROCONF=yes
    IPV6INIT=no
    IPADDR=10.99.0.11
    NETMASK=255.255.0.0
    MTU=1450