IP Networking

Hi
does anybody know how we can add more than one ip for NIC(in Redhat Linux 7.2)?
i usually do it by using this command
ifconfig eth0 add <ip addresss> netmask <..............> up


or ;

ip address add 192.168.20.1/24 dev eth0


or
adding it manually to file in /etc/sysconfig/network-scripts
but their is no ifcfg-eth0 !!!!!
-------------------------------------------------------------
and it works cuz i can ping it from another machine


BUT when i reboot the machine all of the are gone.
I'm looking for way that these IPs can remain on the interface even after
reboot or shut down

is there anyone who can help me up?

Which vendor/version of Linux? Under RedHat the information goes into a config file in /etc/sysconfig/network-scripts.

thanx

i found the file in /etc/sysconfig/networking/devices/ifcfg-eth0

and here i can add the new ip and after reboot everything is ok.

but i don't know how i can have it changed without rebooting and
more important that that i want to add more than one ip for this
interface.
Can anyone help me up?

What you need to do is to add an alias to the interface, in order to do that, do the following. First go to the file /etc/sysconfig/networking/devices/ifcfg-eth0 and add the following lines:

DEVICE=eth0:1
ONBOOT=yes
BOOTPROTO=static
IPADDR= xxx.xxx.xxx.xxx
NETMASK=xxx.xxx.xxx.xxx
GATEWAY=xxx.xxx.xxx.xxx
TYPE=Ethernet
USERCTL=no
NETWORK=xxx.xxx.xxx.xxx
BROADCAST=xxx.xxx.xxx.xxx
PEERDNS=no
Where xxx.xxx.xxx.xxx put the apropriate addresses for your computer. After doing so go to the directory /etc/rc.d/init.d and type ./network stop; ./network start. That will initiate the new configurations. You can add as many IP addresses as you want by just doing the procedures above and changing the DEVICE:eth0:x from 1 to 2,3,... etc. and also by changing the IP address.

Thank you very much

It really worked . and the idea is very reasonble.
You know what I did to have more than 2 IPs?

I put the following commands in the start up (rc.local):
ip address add x.x.x.x/x dev eth0

and it works but it's a bit .... I don't like it.





Thanks anyway

You re wellcome. You can also add an alias to your interface with ifconfig. You can write ifconfig eth0:x <IP ADDRESS> netmask <NETMASK>. But then you must add with route a default gateway to your routing table for the new IP address.

Thank YOU again
yeah I tried it ,cool ....

But it is not perminantt after network stop / start
They'll be gone.

Could you please tell me why the hell do we have so many places to
assign IPs,gateways,... and which one's the main file or ....

thanx