how to config IP alias

rspivack · 09-26-2005, 03:53 PM

I would like to configure multiple IP addresses on a single NIC for name-based hosting.

How do I setup IP alias (or equivalent) network configuration for Fedora Core 3 distro?

imitheos · 09-26-2005, 04:45 PM

Quote:

Originally posted by rspivack
I would like to configure multiple IP addresses on a single NIC for name-based hosting.

How do I setup IP alias (or equivalent) network configuration for Fedora Core 3 distro?

You configure aliases just like a normal interface. You just add a ":" prefix and a number to the interface name.

e.g
ifconfig eth0 192.168.0.2 up (Real interface)
ifconfig eth0:1 192.168.5.2 up (alias)
ifconfig eth0:45 172.16.1.1 (alias)
.
.
.

rspivack · 09-26-2005, 06:10 PM

Do I need "route" commands? In some examples I've seen that, in others none.

Is eth0:0 different from eth0 ? Should I skip using using eth0:0 ?

Some references I've seen said IP aliases is deprecated and to use IPtables? Is that correct or wrong?

Quote:

Originally posted by imitheos
You configure aliases just like a normal interface. You just add a ":" prefix and a number to the interface name.

e.g
ifconfig eth0 192.168.0.2 up (Real interface)
ifconfig eth0:1 192.168.5.2 up (alias)
ifconfig eth0:45 172.16.1.1 (alias)
.
.
.

javaroast · 09-26-2005, 11:25 PM

Use the IP addr command:

ip addr add 192.168.1.5/24 dev eth0
ip addr add 192.168.2.1/24 dev eth0

These are the ip route2 commands and not IP Tables.

rspivack · 09-27-2005, 01:20 PM

Are these transient commands or do they update the configuration files to remain active after a reboot?

Quote:

Originally posted by javaroast
Use the IP addr command:

ip addr add 192.168.1.5/24 dev eth0
ip addr add 192.168.2.1/24 dev eth0

These are the ip route2 commands and not IP Tables.

javaroast · 09-27-2005, 06:07 PM

They are transient, you'll have to load them at boot time by editing your distro's respective config files or adding the commands to load at boot.