Generate an IP Packet with false source address?

Hi!

To check a Cisco's ACL i have to generate a Packet with a faked Source
Address.

Example:

My local network is 10.23.45.0/24, routers ip is 10.23.45.254.
Now i want to send a packet with source ip 172.16.1.1 from the host
with 10.23.45.1

The contents of the Packet do not matter.

Which tool could i use?

chris

Christian Reiter wrote:

> Hi!
>
> To check a Cisco's ACL i have to generate a Packet with a faked Source
> Address.
>
> Example:
>
> My local network is 10.23.45.0/24, routers ip is 10.23.45.254.
> Now i want to send a packet with source ip 172.16.1.1 from the host
> with 10.23.45.1
>
> The contents of the Packet do not matter.
>
> Which tool could i use?
>
> chris

Personally, I would take a spare PC/laptop and reconfigure the interface on
the fly.

Tim

On Mon, 18 Jun 2007 06:58:39 -0000, Christian Reiter <(E-Mail Removed)> wrote:
>
> To check a Cisco's ACL i have to generate a Packet with a faked Source
> Address.
[ snip ]
> The contents of the Packet do not matter.
>
> Which tool could i use?

I like hping (www.hping.org) for this type of thing. You could also
use sendip, rain, etc.


Mike

--
Michael Zawrotny
Institute of Molecular Biophysics
Florida State University | email: (E-Mail Removed)
Tallahassee, FL 32306-4380 | phone: (850) 644-0069

Hi,

You can use a simple perl script, too. But, you must have raw-IP api
installed and root previliges.

-------------------------------------------------------------------
#!/usr/bin/perl

use Net::RawIP;
use Getopt::Long;

my $net = new Net::RawIP;

my $sourceip = "172.16.1.1";
my $destip = "10.0.0.1";
my $sourceport = "44444";
my $destport = "80";

$net->set(
{ ip => {
saddr => $sourceip,
daddr => $destip,
},
tcp => {
source => $sourceport,
dest => $destport,
syn => 1,
},
}
);
$net->send();
-------------------------------------------------------------------

Regards.

Kerem.

Thanks to all of you for your answers!

I did the job with hping.

regards,
chris