CentOS - Oct 2014 - IP aliasing on CentOS 7

Hello all,

is there a good wirte-up on how edit script files in
the /etc/sysconfig/network-scripts directory on Centos & to assign multiple
IP addresses to the same NIC on boot?

Thanks for any and all help.

Cheers,

Boris.

On 15 Oct 2014 22:12, "Boris Epstein" <borepstein at gmail.com>
wrote:
>
> Hello all,
>
> is there a good wirte-up on how edit script files in
> the /etc/sysconfig/network-scripts directory on Centos & to assign
multiple
> IP addresses to the same NIC on boot?
>
> Thanks for any and all help.
>
> Cheers,
>
> Boris.
Funny timing... I wrote up something on this very topic only very recently:

http://www.hogarthuk.com/?q=node/6

You can do multiple IPs on an interface just by doing multiple ipaddr1
ipaddr2 ipaddr3 ipaddrN with matching netmaskN in the ifcfg file for the
interface...

This syntax is compatible with both the network and NetworkManager services.

Hello all,

Thank you for all the great responses.

I meant to reply earlier but it slipped my mind. Sorry.

OK, so according to my experience here is what seems to work.

1) nmtui
Using this utility one can do that without delving into the nitty-gritty,
it seems.

2) By editing the config file. So let us say we have the NIC eno16780032 If
you now edit your config file
( /etc/sysconfig/network-scripts/ifcfg-eno16780032 ) to look like this
------------------------------------------------------------------------------------------
TYPE=Ethernet
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
NAME=eno16780032
UUID=f303271a-dc5c-4fd6-ac61-73c7b78a5b2b
ONBOOT=yes
DNS1=10.1.3.5
DOMAIN=insideidc.com
IPADDR1=10.1.3.226
PREFIX1=24
HWADDR=00:50:56:A6:11:CA
IPADDR=10.1.3.220
PREFIX=24
GATEWAY=10.1.3.10
DNS2=10.1.3.1
DNS3=10.1.3.2
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
------------------------------------------------------------------------------------------

you are going to have two IP addresses (in this scenario, 10.1.3.220 and
10.1.3.226) assigned to the same NIC.

NOTICE: ifconfig will not show them all, use "ip a show" to see them.

Once again, thank you all for responding.

Cheers,

Boris.


On Wed, Oct 15, 2014 at 5:12 PM, Boris Epstein <borepstein at gmail.com>
wrote:
> Hello all,
>
> is there a good wirte-up on how edit script files in
> the /etc/sysconfig/network-scripts directory on Centos & to assign
multiple
> IP addresses to the same NIC on boot?
>
> Thanks for any and all help.
>
> Cheers,
>
> Boris.
>