changing routing table preference

Hi All,

I have 2 interfaces on same subnet ..

intface 1 = subnet 1
intface 2 = subnet 1

whenever any application sends packets ,actually it goes through
interface 1 ..can I change this routing table behaviour and send packet
from interface 2 ( I don't want to do application level changes )


Thanks ,
Rahul

LinuxGuy wrote:
> Hi All,
>
> I have 2 interfaces on same subnet ..
>
> intface 1 = subnet 1
> intface 2 = subnet 1
>
> whenever any application sends packets ,actually it goes through
> interface 1 ..can I change this routing table behaviour and send packet
> from interface 2 ( I don't want to do application level changes )

For simple routing, you must not have two interfaces
in the same subnet.

The more complicated routing methods are explained in the
Adv-Routing-HOWTO, which is available from any Linux
Documentation Project mirror site.

--

Tauno Voipio
tauno voipio (at) iki fi

On 13 Jun 2006, in the Usenet newsgroup comp.os.linux.networking, in article
<(E-Mail Removed). com>, LinuxGuy wrote:

>I have 2 interfaces on same subnet ..

And you are posting from google, yet didn't think to search there first?
This is a very common configuration error, as there are few instances
when it serves a useful purpose.

-rw-rw-r-- 1 gferg ldp 297491 Sep 4 2003 Adv-Routing-HOWTO

>whenever any application sends packets ,actually it goes through
>interface 1 ..

Yup - when you have two interfaces leading to the same place, the kernel
uses the last one you configured because it assumes you changed your mind.

>can I change this routing table behaviour and send packet
>from interface 2 ( I don't want to do application level changes )

Change the sequence they are brought up, or figure out what you are
really trying to accomplish and then check the solutions in the HOWTO.

Old guy

Hi,
Thanks for yourr response..
Actually I want ot change preference anytime betwwen application is
running..

like if I brought up intf1 first and then second one ( intf2 )
so default preference will be for intf1..( considering both on same
subnet )

now I want to change that prefernce nad make second default one (
intf2)..
can you please tell me how to do this..?

Thanks,
Rahul

Moe Trin wrote:
> On 13 Jun 2006, in the Usenet newsgroup comp.os.linux.networking, in article
> <(E-Mail Removed). com>, LinuxGuy wrote:
>
> >I have 2 interfaces on same subnet ..
>
> And you are posting from google, yet didn't think to search there first?
> This is a very common configuration error, as there are few instances
> when it serves a useful purpose.
>
> -rw-rw-r-- 1 gferg ldp 297491 Sep 4 2003 Adv-Routing-HOWTO
>
> >whenever any application sends packets ,actually it goes through
> >interface 1 ..
>
> Yup - when you have two interfaces leading to the same place, the kernel
> uses the last one you configured because it assumes you changed your mind.
>
> >can I change this routing table behaviour and send packet
> >from interface 2 ( I don't want to do application level changes )
>
> Change the sequence they are brought up, or figure out what you are
> really trying to accomplish and then check the solutions in the HOWTO.
>
> Old guy

On 13 Jun 2006, in the Usenet newsgroup comp.os.linux.networking, in article
<(E-Mail Removed) .com>, LinuxGuy wrote:

>Actually I want ot change preference anytime betwwen application is
>running..

-rw-rw-r-- 1 gferg ldp 297491 Sep 4 2003 Adv-Routing-HOWTO

>like if I brought up intf1 first and then second one ( intf2 )
>so default preference will be for intf1..( considering both on same
>subnet )

Why are you doing this? If both interfaces lead to the same place, you
are not accomplishing anything useful. If they do NOT go to the same
place, your network mask is incorrect.

>now I want to change that prefernce nad make second default one (
>intf2)..

Why do you think you need to do this?

Old guy