{{tag>networking routing ipv4}}

====== Add additional ip address on interface ======
First make sure the interface is up:

  ip link set eth0 up

then add an address:
  ip addr add 94.130.84.168/27 dev eth0

///etc/network/interfaces// example (for persistence over reboot):

<code>
root@server ~ # cat /etc/network/interfaces
### Hetzner Online GmbH installimage

source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback
iface lo inet6 loopback

auto eno1
iface eno1 inet static
  address 94.130.84.168
  netmask 255.255.255.128
  gateway 94.130.84.129
  # route 94.130.84.128/25 via 94.130.84.129
  up route add -net 94.130.84.128 netmask 255.255.255.128 gw 94.130.84.129 dev eno1
  up ip addr add 94.130.84.239/25 dev eno1
  down ip addr del 94.130.84.239/25 dev eno1
  up ip addr add 94.130.84.240/25 dev eno1
  down ip addr del 94.130.84.240/25 dev eno1
  up ip addr add 94.130.84.231/25 dev eno1
  down ip addr del 94.130.84.231/25 dev eno1
  up ip addr add 94.130.84.230/25 dev eno1
  down ip addr del 94.130.84.230/25 dev eno1
  up ip addr add 94.130.84.229/25 dev eno1
  down ip addr del 94.130.84.229/25 dev eno1

iface eno1 inet6 static
  address 2a01:4f8:c0:20cb::2
  netmask 64
  gateway fe80::1

auto br0
iface br0 inet static
  address 10.10.10.1
  netmask 255.255.255.0
  bridge_ports none
  bridge_fd 0
  bridge_stp off
  bridge_maxwait 5
  pre-up /sbin/brctl addbr br0

</code>

===== Adding routes =====
Change IPs accordingly:

If you get an error:
  # ip route add default via 15.235.15.254 dev br0
  Error: Nexthop has invalid gateway.

You have to add a route to the gateway itself:
  ip route add 15.235.15.0/24 dev br0 src 15.235.15.201 metric 100

Then you can add a default route.
  ip route add default via 15.235.15.254 dev br0

If you get:
  connect: Network unreachable
when trying to ping an address, you have to add a default route.
====== Tested on ======
  * 

====== See also ======
  * [[set_up_ipv6_host_vm|Set up IPv6 on host and VM]] - example of IPv6 addresses and routes
====== References ======
  * https://access.redhat.com/sites/default/files/attachments/rh_ip_command_cheatsheet_1214_jcs_print.pdf