2 ip addresses on same network card

Dear friends,

How could I assign two different IP addresses to the same network card?
The addresses are: 10.0.0.1/255.0.0.0 and 89.0.0.1/255.255.255.0.
Is there a "tool" to make such an assignment easier?
The current IP address is 89.0.0.1

Thanks in advance,
Sotiris.

On 2005-05-13, Sotiris Rentoulis <(E-Mail Removed)> wrote:
> How could I assign two different IP addresses to the same network card?

Using ifconfig ethx:1, ifconfig ethx:2, ifconfig ethx:3 ....
man ifconfig for more info.

Davide

--
Windows NT: Only 16 megs needed to play Minesweeper!

Davide Bianchi wrote:
> Using ifconfig ethx:1, ifconfig ethx:2, ifconfig ethx:3 ....
> man ifconfig for more info.

That would add secondary addresses to the interface, but you
can add primary addresses with the "ip" tool from iproute2.

> Davide

Regards.

--

Jose Maria Lopez Hernandez
Director Tecnico de bgSEC
(E-Mail Removed)
bgSEC Seguridad y Consultoria de Sistemas
http://www.bgsec.com
ESPAÑA

The only people for me are the mad ones -- the ones who are mad to live,
mad to talk, mad to be saved, desirous of everything at the same time,
the ones who never yawn or say a commonplace thing, but burn, burn, burn
like fabulous yellow Roman candles.
-- Jack Kerouac, "On the Road"

"Sotiris Rentoulis" <(E-Mail Removed)> writes:

> Dear friends,

>How could I assign two different IP addresses to the same network card?
>The addresses are: 10.0.0.1/255.0.0.0 and 89.0.0.1/255.255.255.0.
>Is there a "tool" to make such an assignment easier?
>The current IP address is 89.0.0.1

Why would you want to?

Unruh wrote:

> "Sotiris Rentoulis" <(E-Mail Removed)> writes:
>
>> Dear friends,
>
>>How could I assign two different IP addresses to the same network card?
>>The addresses are: 10.0.0.1/255.0.0.0 and 89.0.0.1/255.255.255.0.
>>Is there a "tool" to make such an assignment easier?
>>The current IP address is 89.0.0.1
>
> Why would you want to?

He might want to give both a local network and real world address to the
same computer.

Sotiris Rentoulis wrote:
> Dear friends,
>
> How could I assign two different IP addresses to the same network card?
> The addresses are: 10.0.0.1/255.0.0.0 and 89.0.0.1/255.255.255.0.
> Is there a "tool" to make such an assignment easier?
> The current IP address is 89.0.0.1
>
> Thanks in advance,
> Sotiris.
>
>

The 89.x.y.z address range is reserved.

If you really try to use it, please *don't*.

There are prefectly good address ranges in RFC 1819 for
private use:

10.0.0.0 to 10.255.255.255
172.16.0.0 to 172.31.255.255
192.168.0.0 to 192.168.255.255

--

Tauno Voipio
tauno voipio (at) iki fi

Jose Maria Lopez Hernandez wrote:


> That would add secondary addresses to the interface

Strictly speaking: no, it creates sub interfaces and associates IPs with
them.

Chris

--
http://www.lowth.com/rope - Nice'n'easy scripting language for writing
your own iptables packet matching logic.

See it in action for controlling the Gnutella protocol at..
http://www.lowth.com/rope/BlockingGnutella

Chris Lowth wrote:
> Strictly speaking: no, it creates sub interfaces and associates IPs with
> them.

If you do a:
iconfig eth0:1 192.168.7.2
ip addr show

2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:00:39:64:2b:81 brd ff:ff:ff:ff:ff:ff
inet 192.168.7.1/24 brd 192.168.7.255 scope global eth0
inet 192.168.7.2/24 brd 192.168.7.255 scope global secondary eth0:1
inet6 fe80::200:39ff:fe64:2b81/64 scope link
valid_lft forever preferred_lft forever

It will show you that they are just secondary addresses to the main
interface. Really both things are the same, you just view them as
one thing or the other using one tool or the other.

> Chris

Regards.

--

Jose Maria Lopez Hernandez
Director Tecnico de bgSEC
(E-Mail Removed)
bgSEC Seguridad y Consultoria de Sistemas
http://www.bgsec.com
ESPAÑA

The only people for me are the mad ones -- the ones who are mad to live,
mad to talk, mad to be saved, desirous of everything at the same time,
the ones who never yawn or say a commonplace thing, but burn, burn, burn
like fabulous yellow Roman candles.
-- Jack Kerouac, "On the Road"

It depends on the OS u are using.

In linux you can do it by creating subinterfaces, but procedure is
different.

In RHLinux
======
you have to create a interface configuration file in
/etc/sysconfig/network-scripts/ifcfg-eth:x for each subinterface
(number x). e.g.,

for 10.0.0.1/255.0.0.0 to be associated with eth0:1 interfae create a
file /etc/sysconfig/network-scripts/ifcfg-eth0:1 and add the following
information

DEVICE=eth0:1
ONBOOT=yes/no (if u want the if comeup auto)
BOOTPROTO=static
IPADDR=10.0.0.1
NETMASK=255.255.255.0
NETWORK=10.0.0.0
TYPE=Ethernet
GATEWAY=10.0.0.x

Thats it and run 'service network restart'

KIRAN