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Accepted
Dave Drager
Asked: 2009-06-18 03:01:41 +0800 CST

How To Add Multiple /24 Network IPs in Ubuntu

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We have a client who needs to set up 2 Class C (/24) address ranges in Ubuntu. We have a single nic connected to the switch currently and the IPs are set up at the switch.

We have done this many times in RedHat based systems by using the IPADDR_START and IPADDR_END options in the ifcfg file such as this:

IPADDR_START=192.168.0.1
IPADDR_END=192.168.0.254

However this does not appear to be an option in Ubuntu. You have to set them up individually like so:

auto eth0:x
iface eth0:x inet static
address [IP ADDRESS]
netmask 255.255.255.0

Which is fine to shell script the creation of this file. But, I understand 'x' can only go up to 256 which would only allow one class C.

Does anyone know how we can add multiple class C ips to a single nic?

ubuntu ip cidr eth0

1 Answers

  1. Best Answer

    Add a pile of up lines like so:

    iface eth0 inet static
  address 192.168.0.1
  netmask 255.255.255.0
  up ip addr add 192.168.0.2/24 dev eth0
  up ip addr add 192.168.0.3/24 dev eth0
  up ip addr add 192.168.0.4/24 dev eth0
  up ip addr add 192.168.0.5/24 dev eth0
  ...
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