About net part of the kernel

About net part of the kernel

[Sandeep Gopal Nijsure]

Hi,

I want to make, say, a machine 10.0.0.5 accept an IP packet with the
destination address of 10.0.0.2. I hope I can do this by changing a bit of
kernel networking code, where it's decided whether to accept an IP packet
as a local packet.. I could not locate the code.. could anybody tell me
where exactly the decision process take place?

Thanks a lot..
Sandeep 

Re: About net part of the kernel

[Ben Collins]

On Tue, Feb 19, 2002 at 10:58:53PM -0600, Sandeep Gopal Nijsure wrote:
> Hi,
> 
> I want to make, say, a machine 10.0.0.5 accept an IP packet with the
> destination address of 10.0.0.2. I hope I can do this by changing a bit of
> kernel networking code, where it's decided whether to accept an IP packet
> as a local packet.. I could not locate the code.. could anybody tell me
> where exactly the decision process take place?

You could just use device aliasing:

ifconfig eth0 10.0.0.5
ifconfig eth0:1 10.0.0.2

Either that, or if you simply want to sniff network packets, look into
turning on promiscuous mode (as tcpdump does).

-- 
 .----------=======-=-======-=========-----------=====------------=-=-----.
/       Ben Collins    --    Debian GNU/Linux    --    WatchGuard.com      \
`          bcollins@debian.org   --   Ben.Collins@watchguard.com           '
 `---=========------=======-------------=-=-----=-===-======-------=--=---'

RE: About net part of the kernel

[Alex Song]

you don't have to change and part of the kernel, you can do what you want
with ipchains (2.2 kernels) or iptables (2.4 kernels).

cheers,

alex

> -----Original Message-----
> From: linux-kernel-owner@vger.kernel.org
> [mailto:linux-kernel-owner@vger.kernel.org]On Behalf Of Sandeep Gopal
> Nijsure
> Sent: Wednesday, 20 February 2002 2:59 PM
> To: linux-kernel@vger.kernel.org
> Subject: About net part of the kernel
>
>
> Hi,
>
> I want to make, say, a machine 10.0.0.5 accept an IP packet with the
> destination address of 10.0.0.2. I hope I can do this by changing a bit of
> kernel networking code, where it's decided whether to accept an IP packet
> as a local packet.. I could not locate the code.. could anybody tell me
> where exactly the decision process take place?
>
> Thanks a lot..
> Sandeep
>
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
>

RE: About net part of the kernel

[Alex Song]

ignore what i said before, i misread the question.

cheers,

alex

> -----Original Message-----
> From: linux-kernel-owner@vger.kernel.org
> [mailto:linux-kernel-owner@vger.kernel.org]On Behalf Of Alex Song
> Sent: Wednesday, 20 February 2002 3:10 PM
> To: Sandeep Gopal Nijsure; linux-kernel@vger.kernel.org
> Subject: RE: About net part of the kernel
>
>
> you don't have to change and part of the kernel, you can do what you want
> with ipchains (2.2 kernels) or iptables (2.4 kernels).
>
> cheers,
>
> alex
>
> > -----Original Message-----
> > From: linux-kernel-owner@vger.kernel.org
> > [mailto:linux-kernel-owner@vger.kernel.org]On Behalf Of Sandeep Gopal
> > Nijsure
> > Sent: Wednesday, 20 February 2002 2:59 PM
> > To: linux-kernel@vger.kernel.org
> > Subject: About net part of the kernel
> >
> >
> > Hi,
> >
> > I want to make, say, a machine 10.0.0.5 accept an IP packet with the
> > destination address of 10.0.0.2. I hope I can do this by
> changing a bit of
> > kernel networking code, where it's decided whether to accept an
> IP packet
> > as a local packet.. I could not locate the code.. could anybody tell me
> > where exactly the decision process take place?
> >
> > Thanks a lot..
> > Sandeep
> >
> >
> > -
> > To unsubscribe from this list: send the line "unsubscribe
> linux-kernel" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at  http://www.tux.org/lkml/
> >
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
>