Re: IP Spoofing/Masquarading

[Jared Curtis <jared () w00ttech com>]

Assuming that the ISP is not filtering RFC1918 address than the packet
will travel like any other.  The source IP is not used in routing to
the destination network.  The return trip will need to use the source
IP address.  In the case of a spoofed IP attack, the attacker will NOT
be able to receive the response packets unless they are some how
sniffing the connection.  A spoofed IP attack is used mostly in DoS
attacks or in situations where the attacker can guess all the response
packets.


On Wed, Sep 9, 2009 at 1:37 AM, M.D.Mufambisi<mufambisi () gmail com> wrote:
> Im not sure im being clear here. How does the packet get to the
> firewall in the first place when it has a source address of a machine
> within the firewall perimeter?
>
> internet--------------firewall(router)--------------lan
>
> from the internet....how does the packet get to the firewall when it
> has the lan ip addresses (ie private addresses)? Or am i failing to
> understand how this attack works?
>
>
>
> On 9/9/09, Sebastiaan <littlebighuman () gmail com> wrote:
> > It usually doesn't. Most firewalls will drop this by default as will many
> > routers.
> >
> > On 9/9/09, M.D.Mufambisi <mufambisi () gmail com> wrote:
> > > I understand that IP packets can be spoofed ie change the source
> > > address to make it look like they originated from the internal LAN.
> > > However, when this is done across the internet, with a private IP
> > > address in its source field, how does this packet get routed through
> > > the internet?
> > >
> > > Kind Regards
> > >
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> ------------------------------------------------------------------------
> This list is sponsored by: Information Assurance Certification Review Board
>
> Prove to peers and potential employers without a doubt that you can actually do a proper penetration test. IACRB CPT 
> and CEPT certs require a full practical examination in order to become certified.
>
> http://www.iacertification.org
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This list is sponsored by: Information Assurance Certification Review Board

Prove to peers and potential employers without a doubt that you can actually do a proper penetration test. IACRB CPT 
and CEPT certs require a full practical examination in order to become certified. 

http://www.iacertification.org
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