[ale] IP Masquerading Question

[Joseph A Knapka]

bkruger at mindspring.com wrote:
> 
> Thanks for the quick reply.  I think I have this... (please confirm)
> 
> Regardless of the origin's MAC address on the subnetwork, all packets routed from the subnet leaves the server with the MAC of the NIC that is connected to the cable modem.  Therefore, the only IP address Knology will see will be from that of the NIC attached to the cable modem, and the only MAC it will see will be from the same NIC that is attached to the cable modem.

Yes. In general, MAC addresses and IP addresses are totally different
sorts of beasts. IP addresses are (usually) globally unique, and
routable across different physical networks. A MAC address is only
meaningful on the physical network to which the NIC is attached.
MAC addresses are (normally) never ever passed across physical
network boundaries, and NAT has no bearing on the question. The
meaning of the verb "routing" is, essentially, "deciding based
on the logical (IP) address of a packet which local physical
(MAC) address is the correct next destination for the packet."

Cheers,

-- Joe
 
> Regards - Bob Kruger
> 
> vaidhy at loonys.net wrote:
> > IPMasq does not spoof.. but it will fit your purpose.. The firewall/gateway rewrites the address
> on the tcp packet to make it look like it is coming from the gateway.. then it rewrites the
> address on the return packet..
> 
> Vaidhy
> 
> On Thu, Jan 24, 2002 at 01:46:54PM -0500, bkruger at mindspring.com wrote:
> > I was looking at installing Knology cable in my house.  One of their plans requires that you send them the MAC address of the NIC to them for access.
> >
> > If this is the case, will IP masquerading for a small subnet "spoof" the MAC address for all outward packets to the MAC of the NIC attached to the cable modem?  I've looked over some of the docs for IP Masquerading, but have not been able to confirm/deny this.  It is probably right under my nose....
> >
> > Regards - Bob Kruger
> >
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