multiple ips in debian

sde · 03-03-2003, 06:06 PM

can anyone show me how i can configure multiple static ips in debian?

Slimy · 03-03-2003, 07:08 PM

Quote:

Originally posted by sde
can anyone show me how i can configure multiple static ips in debian?

Do you mean multiple static IPs on the same interface (IP aliasing)?

sde · 03-03-2003, 07:12 PM

yes .. i have a range of 6 ips i need to configure to 1 nic

Slimy · 03-03-2003, 07:27 PM

If you are using a 2.2 kernel, you need to enable IP aliasing. In a 2.4 kernel this is automatically supported.

If I have a static IP of 192.168.42.1 on eth1, and I wish to create an alias address for that adapter, I do this at the command line:
ifconfig eth1:1 192.168.42.72

A quick check using ifconfig (with no parameters) should show an entry for a device called eth1:1, with address 192.168.42.72.

If it worked, you're ready to add it to /etc/network/interfaces, where ifup and ifdown can get to it.

Code:

auto eth1
iface eth1 inet static
     address 192.168.42.1
     netmask 255.255.255.0
     broadcast 192.168.42.255
     network 192.168.42.0

auto eth1:1
iface eth1:1 inet static
     address 192.168.42.72
     netmask 255.255.255.0
     broadcast 192.168.42.255
     network 192.168.42.0

sde · 03-03-2003, 07:30 PM

thanks a lot! i screwed up my network config so i have to wait for the data center to get in there .. but at least now i know the right way.

thankyou

Slimy · 03-03-2003, 07:34 PM

Also note the format of the alias:
<interface>:<alias> (for example eth2:23)

<alias> can be any number between 0 and 255,
but some operating systems (like Solaris) won't allow <alias> to be 0.
Linux likes eth2:0 just fine, though.

sde · 03-03-2003, 07:43 PM

excellent to know .. i'll probably just use eth0:0 to eth0:5 for my ips.
thanks!

acidreign · 04-01-2003, 06:23 PM

Something which may, or may not be relavant, if you are doing virtual hosting, you can often present a different service to different clients depending on the name that they have looked up.

ie.. beta3.no-ip.com resolves to the same ip as
wmealing.no-ip.ocm

Depending on what name they look up, the virtual service handler can look at them differentlty.

Multiple IP's may be the easiest way in this situation, but its worth learning. Check out each of the daemons if they support virtual hosts. Most of the more common ones do.