OT: alias for a network card

OT: alias for a network card

[Payal Rathod]

Hi,
Excuse for this OT question here. But I don't know where I can get an
answer. While doing  NAT i need to have alias IPs for my router
machine like,
# ipconfig eth0:1 192.168.0.4

But these rules are lost once the machine is rebooted. How can I  make
them permanent?
I thought of putting these in rc.local but it rather crude approach as
my firewall might be started before that. I use Mandrake Linux.

Thanks a lot in advance.
With warm regards,
-Payal

Re: OT: alias for a network card

[Erik Wikström]

On Thu, Jul 15, 2004 at 01:51:41PM +0530, Payal Rathod wrote:

> Hi,
> Excuse for this OT question here. But I don't know where I can get an
> answer. While doing  NAT i need to have alias IPs for my router
> machine like,
> # ipconfig eth0:1 192.168.0.4
> 
> But these rules are lost once the machine is rebooted. How can I  make
> them permanent?
> I thought of putting these in rc.local but it rather crude approach as
> my firewall might be started before that. I use Mandrake Linux.

Find out what script starts the firewall and put the line before the
line starting the firewall. Or, put it in the firewall script. Or even
better, put it in the script that initializes your network card.

--
Erik Wikström

Re: OT: alias for a network card

[Payal Rathod]

Hi,
On Thu, 15 Jul 2004 14:28:48 +0200, Erik Wikström 

> Find out what script starts the firewall and put the line before the
> line starting the firewall. Or, put it in the firewall script. Or even
> better, put it in the script that initializes your network card.

I think I got it licked. BTW, is initializing IPs in /etc/rc.local a
bad practice?

With warm regards,
-payal

Re: OT: alias for a network card

[Saad Faruque]

rc.local is not the best place to place your initializing script

On Sun, 18 Jul 2004 18:44:12 +0530, Payal Rathod <payalrathod@gmail.com> wrote:
> Hi,
> On Thu, 15 Jul 2004 14:28:48 +0200, Erik Wikström
> 
> > Find out what script starts the firewall and put the line before the
> > line starting the firewall. Or, put it in the firewall script. Or even
> > better, put it in the script that initializes your network card.
> 
> I think I got it licked. BTW, is initializing IPs in /etc/rc.local a
> bad practice?
> 
> With warm regards,
> -payal
> 
>

Re: OT: alias for a network card

[Aleksandar Milivojevic]

Payal Rathod wrote:
> Hi,
> Excuse for this OT question here. But I don't know where I can get an
> answer. While doing  NAT i need to have alias IPs for my router
> machine like,
> # ipconfig eth0:1 192.168.0.4
> 
> But these rules are lost once the machine is rebooted. How can I  make
> them permanent?
> I thought of putting these in rc.local but it rather crude approach as
> my firewall might be started before that. I use Mandrake Linux.

It is OK to have firewall rules loaded before your interfaces are 
configured.  I would go a step further and say that it is recommended. 
On most Linux distribution I saw that is exactly the order how things 
are done during boot (first iptables, than network).  This way you don't 
have that one or two seconds gap when your machine/network is unprotected.

As for original question, check how and where your "normal" interfaces 
are configured.  On RedHat it is file ifcfg-IF_NAME (where X is 
interface number, for example for eth0 file is ifcfg-eth0) in 
/etc/sysconfig/network-scripts directory (so if you want virtual 
interface on eth0, you just create ifcfg-eth0:1 file).  Solaris does it 
the same way (/etc/hostname.hme0, /etc/hostname.hme0:1 and so on).  On 
Mandrake it is probably something similar (when you find how the normal 
interfaces are configured, virtuals are most likely configured the very 
same way).

-- 
Aleksandar Milivojevic <amilivojevic@pbl.ca>    Pollard Banknote Limited
Systems Administrator                           1499 Buffalo Place
Tel: (204) 474-2323 ext 276                     Winnipeg, MB  R3T 1L7